Aplysiidae
Every nudibranchs & sea slug on Fin, recorded across our dive sites.
Aplysiidae spp.
Pleurobranchidae spp.
Jorunna spp.
Aegires punctilucens
Pteraeolidia spp.
Phyllidia varicosa
Chromodoris spp.
Melibe spp.
Cratena peregrina
Flabellina affinis
Nembrotha spp.
Phyllidia elegans
Peltodoris atromaculata
Edmundsella pedata
Roboastra spp.
Phyllidia picta
Felimare picta
Felimare tricolor
Phidiana spp.
Elysia crispata
Notodoris gardineri
Melibe viridis
Chromodoris annae
Thuridilla hopei
Luisella babai
Notodoris citrina
Neptunazurea kempfi
Polycera quadrilineata
Phyllidia ocellata
Nembrotha kubaryana
Flabellina ischitana
Phyllidia coelestis
Diaphorodoris papillata
Elysia timida
Doriprismatica atromarginata
Antiopella cristata
Jorunna funebris
Chromodoris willani
Phyllidiella pustulosa
Felimare fontandraui
Chromodoris lochi
Chromodoris magnifica
Rudmania krohni
Goniobranchus geometricus
Onchidoris bilamellata
Diaphorodoris alba
Ceratosoma amoenum
Hypselodoris tryoni
Elysia viridis
Jorunna tomentosa
Rudmania purpurea
Limacia clavigera
Coryphellina exoptata
Flabellina cavolini
Felimare villafranca
Felimare cantabrica
Felimare orsinii
Goniobranchus kuniei
Tambja morosa
Nembrotha cristata
Doris montereyensis
Phyllodesmium briareum
Nemesignis banyulensis
Facelina bostoniensis
Chromodoris quadricolor
Hypselodoris bullockii
Caloria indica
Doriopsilla areolata
Chelidonura amoena
Nembrotha lineolata
Caloria elegans
Nembrotha milleri
Archidoris pseudoargus
Halgerda batangas
Nembrotha chamberlaini
Felimida binza
Facelina auriculata
Trinchesia morrowae
Crimora papillata
Goniobranchus coi
Elysia marginata
Facelina rubrovittata
Felimare bilineata
Pelagella castanea
Diaulula sandiegensis
Felimida luteorosea
Doris verrucosa
Chelidonura hirundinina
Flabellinopsis iodinea
Acanthodoris pilosa
Peltodoris nobilis
Caloria quatrefagesi
Geitodoris planata
Diaulula odonoghuei
Hermissenda crassicornis
Thecacera picta
Hypselodoris pulchella
Chromodoris alcalai
Coryphella gracilis
Thecacera pennigera
Dendronotus frondosus
Polycera kernowensis
Phyllidia flava
Hypselodoris apolegma
Acanthodoris nanaimoensis
Pleurobranchus forskalii
Hermissenda opalescens
Coryphella verrucosa
Candiella odhneri
Goniodoridella picoensis
Phestilla sibogae
Rostanga pulchra
Chelidonura varians
Elysia diomedea
Goniobranchus splendidus
Dendrodoris krusensternii
Aeolidia filomenae
Glossodoris rufomarginata
Tergipes tergipes
Aeolidia papillosa
Dirona albolineata
Goniobranchus fidelis
Sagaminopteron psychedelicum
Ardeadoris egretta
Ceratosoma tenue
Spurilla neapolitana
Ceratosoma brevicaudatum
Hypselodoris bennetti
Felimare californiensis
Navanax inermis
Orienthella trilineata
Phyllidiopsis shireenae
Diaphorodoris luteocincta
Trapania tartanella
Amphorina linensis
Catriona aurantia
Goniobranchus leopardus
Okenia nodosa
Doris berghi
Samla bicolor
Trapania lineata
Felimare ruthae
Fiocuthona concinna
Phyllidia alyta
Doto coronata
Berthella plumula
Reticulidia fungia
Chromodoris strigata
Trinchesia caerulea
Placida dendritica
Onchidoris muricata
Glaucus atlanticus
Halgerda wasinensis
Chromodoris colemani
Polycera atra
Coryphella lineata
Favorinus branchialis
Janolus hyalinus
Hypselodoris imperialis
Notodoris minor
Berthellina edwardsii
Plakobranchus ocellatus
Elysia gordanae
Phyllidiella zeylanica
Favorinus tsuruganus
Dendronotus venustus
Triopha catalinae
Aphelodoris varia
Goniobranchus hintuanensis
Antiopella fusca
Jorunna rubescens
Limenandra nodosa
Aegires albopunctatus
Triopha maculata
Thorunna furtiva
Ceratosoma gracillimum
Phyllidia marindica
Polycera capensis
Berghia coerulescens
Hypselodoris roo
Melibe leonina
Elysia ornata
Aeolidiella glauca
Costasiella usagi
Hypselodoris zephyra
Platydoris argo
Cadlina laevis
Doriopsilla fulva
Reticulidia halgerda
Pleurobranchus areolatus
Hypselodoris nigrostriata
Learchis poica
Candiella manicata
Mexichromis trilineata
Goniobranchus annulatus
Hypselodoris decorata
Limacia cockerelli
Felimida macfarlandi
Ceratodoris rosacea
Triopha modesta
Doto fragilis
Chromodoris westraliensis
Tomoberthella martensi
Phyllidiopsis xishaensis
Costasiella ocellifera
Tenellia ocellata
Dendrodoris krebsii
Neptunazurea porterae
Bornella anguilla
Cadlina pellucida
Hypselodoris obscura
Tubulophilinopsis pilsbryi
Doris chrysoderma
Roboastra gracilis
Bosellia mimetica
Taringa telopia
Goniobranchus verrieri
Tritonia hombergii
Dendronotus iris
Doriopsilla albopunctata
Halgerda indotessellata
Goniobranchus collingwoodi
Felimare agassizii
Ercolania coerulea
Hypselodoris krakatoa
Spurilla braziliana
Chromolaichma sedna
Navanax gemmatus
Glossodoris acosti
Austraeolis ornata
Ceratosoma trilobatum
Tritonicula hamnerorum
Coryphellina flamma
Cadlinella ornatissima
Facelinopsis marioni
Eubranchulus rupium
Longibranchus putnami
Pleurobranchaea maculata
Costasiella kuroshimae
Phyllidia exquisita
Phyllidiella nigra
Phyllidiella rosans
Pleurobranchus peronii
Asteronotus cespitosus
Chromodoris elisabethina
Bulbaeolidia alba
Phyllidiopsis annae
Aegires villosus
Halgerda willeyi
Miamira sinuata
Babakina anadoni
Elysia velutinus
Facelina annulicornis
Dondice occidentalis
Bonisa nakaza
Candiella lineata
Mexichromis multituberculata
Tambja verconis
Plocamopherus imperialis
Hypselodoris maculosa
Hypselodoris variobranchia
Hypselodoris whitei
Ancula gibbosa
Acanthodoris hudsoni
Thuridilla lineolata
Gargamella rosi
Flabellina gabinierei
Chromolaichma hemera
Limacia mcdonaldi
Tayuva lilacina
Dendrodoris nigra
Elysia coodgeensis
Goniobranchus setoensis
Hypselodoris emma
Phidiana hiltoni
Rostanga rubra
Trinchesia cuanensis
Felimida clenchi
Colpodaspis thompsoni
Amphorina farrani
Phyllodesmium poindimiei
Chromodoris kuiteri
Doriopsilla pelseneeri
Cratena capensis
Camachoaglaja africana
Phyllidia undula
Nembrotha purpureolineata
Phyllidiopsis krempfi
Edmundsella dushia
Phyllodesmium horridum
Thuridilla mazda
Philinopsis speciosa
Doto pinnatifida
Pleurobranchus grandis
Candiella striata
Hypselodoris infucata
Phestilla melanobrachia
Halgerda terramtuentis
Hypselodoris capensis
Discodoris boholiensis
Chromodoris joshi
Cyerce elegans
Elysia pusilla
Aegires leuckartii
Goniobranchus vibratus
Goniobranchus daphne
Plakobranchus papua
Goniobranchus albonares
Cyerce nigra
Boreoberthella chacei
Hypselodoris jacksoni
Gymnodoris ceylonica
Thecacera pikachu
Cratena lineata
Geitodoris heathi
Halgerda tessellata
Spurilla sargassicola
Okenia amoenula
Verconia haliclona
Notodoris serenae
Lecithophorus capensis
Oxynoe viridis
Aphelodoris luctuosa
Glossodoris angasi
Berthella ocellata
Dendrodoris arborescens
Cadlina luteomarginata
Hypselodoris peasei
Thuridilla carlsoni
Chromodoris hamiltoni
Antiopella capensis
Nudibranchus exiguus
Thorunna daniellae
Aeolidiella alderi
Phyllidia polkadotsa
Carminodoris nodulosa
Doto ussi
Melibe colemani
Elysia flava
Gymnodoris inornata
Tambja capensis
Doriprismatica balut
Goniobranchus heatherae
Antiopella longidentata
Hypselodoris paradisa
Coryphella piunca
Chelidonura livida
Phyllodesmium jakobsenae
Gymnodoris impudica
Polycera hedgpethi
Dendrodoris limbata
Amphorina viriola
Ceratophyllidia papilligera
Tritonia festiva
Tyrannodoris luteolineata
Palio dubia
Coryphellina marcusorum
Coryphella capensis
Glossodoris pallida
Caloria militaris
Elysia ellenae
Miamira moloch
Ercolania boodleae
Thecacera pacifica
Tenellia miniostriata
Thuridilla picta
Verconia simplex
Phyllodesmium koehleri
Pleurobranchaea bubala
Dermatobranchus ornatus
Sagaminopteron nigropunctatum
Doris fontainii
Thorunna kahuna
Cyerce blackburnae
Doto cervicenigra
Ardeadoris angustolutea
Coryphella chriskaugei
Doriopsilla carneola
Elysia cornigera
Nanuca sebastiani
Polycera faeroensis
Bermudella brunneomaculata
Hermaea bifida
Unidentia sandramillenae
Hypselodoris festiva
Favorinus mirabilis
Tritoniopsis frydis
Cyerce katiae
Marionia blainvillea
Phyllidia rueppelii
Okenia elegans
Nakamigawaia felis
Tularia bractea
Diaulula punctuolata
Nembrotha lorosae
Coryphellina poenicia
Limacia jellyi
Aeolidia loui
Goniobranchus tasmaniensis
Phyllodesmium serratum
Chromodoris kalawakan
Jason mirabilis
Flabellina funeka
Doto floridicola
Glossodoris bonwanga
Mexichromis mariei
Elysia pratensis
Baeolidia moebii
Coryphella longicaudata
Rostanga arbutus
Doris cameroni
Oxynoe antillarum
Diversidoris crocea
Doto pita
Chromodoris africana
Nanuca leali
Austraeolis catina
Aphelodoris antillensis
Mexichromis macropus
Learchis evelinae
Phyllodesmium opalescens
Ardeadoris tomsmithi
Limacia lucida
Miamira miamirana
Polycera norvegica
Doriopsilla gemela
Antiopella barbarensis
Phyllodesmium rudmani
Goniobranchus thompsoni
Phyllodesmium longicirrum
Goniobranchus geminus
Ardeadoris rubroannulata
Goniobranchus epicurius
Elysia jibacoaensis
Gymnodoris crocea
Goniobranchus sinensis
Cadlina sylviaearleae
Thuridilla albopustulosa
Chelidonura alisonae
Halgerda carlsoni
Platydoris angustipes
Verconia verconis
Chromodoris orientalis
Chromodoris dianae
Samla bilas
Tambja mullineri
Goniobranchus albopustulosus
Elysia zuleicae
Thuridilla moebii
Luisella engeli
Cadlina flavomaculata
Hypselodoris katherinae
Goniobranchus woodwardae
Dondice freddiemercuryi
Goniobranchus preciosus
Elysia papillosa
Hypselodoris violacea
Dirona picta
Bornella calcarata
Doto greenamyeri
Tenellia puti
Aldisa sanguinea
Eubranchus rustyus
Camachoaglaja mariagordae
Phyllodesmium macphersonae
Lobiger souverbii
Hypselodoris saintvincentius
Pleurobranchus hilli
Doto amyra
Tritonicula wellsi
Phyllodesmium crypticum
Doris wellingtonensis
Mariaglaja tsurugensis
Kaloplocamus ramosus
Ceratosoma ingozi
Tambja olivaria
Berthellina delicata
Hypselodoris regina
Dendronotus albus
Mariaglaja inornata
Carminodoris estrelyado
Tambja tenuilineata
Elysia expansa
Dirona pellucida
Dendrodoris caesia
Pleurobranchus weberi
Doriprismatica stellata
Dicata odhneri
Hiatodoris fellowsi
Godiva quadricolor
Trapania brunnea
Hypselodoris purpureomaculosa
Doris odhneri
Aplysiopsis enteromorphae
Sacoproteus smaragdinus
Polycera tricolor
Cuthona tina
Dendrodoris grandiflora
Limacia inesae
Pruvotfolia rhodopos
Miamira flavicostata
Thuridilla decorata
Rostanga crawfordi
Anteaeolidiella oliviae
Elysia zemi
Coryphella trophina
Cuthona divae
Bulbaeolidia oasis
Tubulophilinopsis gardineri
Adalaria proxima
Glossodoris hikuerensis
Doto furva
Phyllodesmium colemani
Tambja gabrielae
Phyllodesmium magnum
Pleurobranchus albiguttatus
Notobryon wardi
Baenopsis baetica
Armina scotti
Ceratodoris mellita
Phyllidiella rudmani
Diaphorodoris lirulatocauda
Dendrodoris elongata
Anteaeolidiella chromosoma
Dendrodoris citrina
Goniobranchus conchyliatus
Armina californica
Doto urak
Goniobranchus aureomarginatus
Tubulophilinopsis lineolata
Leminda millecra
Cerberilla potiguara
Dermatobranchus caeruleomaculatus
Glossodoris buko
Favorinus vitreus
Thuridilla gracilis
Placida verticilata
Goniobranchus fabulus
Austraeolis stearnsi
Produnga rubropunctata
Gymnodoris striata
Oxynoe kylei
Palisa papillata
Idaliadoris depressa
Taringa halgerda
Thorunna florens
Noumeaella rehderi
Tenellia thelmae
Atagema intecta
Armina occulta
Plocamopherus maderae
Hypselodoris maritima
Siphopteron tigrinum
Acanthodoris rhodoceras
Babakina festiva
Thuridilla ratna
Marioniopsis viridescens
Euselenops luniceps
Apata pricei
Cadlina limbaughorum
Gastropteron pacificum
Sclerodoris tuberculata
Martadoris limaciformis
Chromodoris celinae
Marioniopsis arborescens
Aglaja tricolorata
Dendronotus subramosus
Biuve fulvipunctata
Kaloplocamus acutus
Melanochlamys miqueli
Trapania euryeia
Janolus mokohinau
Cyerce graeca
Gastropteron chacmol
Nembrotha aurea
Pleurolidia juliae
Idaliadoris neapolitana
Thordisa bimaculata
Goniobranchus hunterae
Alloiodoris lanuginata
Trapania benni
Phyllidia willani
Hypselodoris skyleri
Cabangus regius
Phyllodesmium hyalinum
Tenellia albocrusta
Ardeadoris averni
Tenellia nakapila
Pleurobranchaea brockii
Goniobranchus loringi
Murphydoris adusta
Thuridilla neona
Janolus eximius
Hypselodoris iba
Corambe steinbergae
Jorunna pantherina
Thuridilla vataae
Pleurobranchaea californica
Doto kya
Eubranchus ocellatus
Nembrotha mullineri
Atagema spongiosa
Coryphella cooperi
Nembrotha livingstonei
Trapania palmula
Acanthodoris lutea
Tenellia bughaw
Platydoris sanguinea
Ceratodoris atkinsonorum
Goniobranchus decorus
Bermudella angelensis
Mourgona murca
Thecacera melkyi
Miamira alleni
Corambe pacifica
Verconia romeri
Aglaja ocelligera
Elysia hedgpethi
Hypselodoris bertschi
Tenellia speciosa
Sebadoris fragilis
Janolus savinkini
Hypselodoris confetti
Baeolidia australis
Baptodoris mimetica
Pauleo jubatus
Trapania vitta
Philine aperta
Thorunna halourga
Sakuraeolis nungunoides
Cratena simba
Hallaxa chani
Spinophallus falciphallus
Phyllidiopsis sinaiensis
Chelidonura cubana
Cadlina modesta
Plocamopherus ceylonicus
Cyerce basi
Odontoglaja guamensis
Asteronotus mimeticus
Melibe coralophilia
Elysia maoria
Dendrodoris fumata
Tenellia kuiterorum
Favorinus japonicus
Berthellina citrina
Cadlina sparsa
Ardeadoris scottjohnsoni
Diversidoris sulphurea
Chromodoris aspersa
Amanda armata
Mexichromis pusilla
Anteaeolidiella cacaotica
Samla riwo
Limenandra confusa
Eubranchopsis virginalis
Tritoniopsis elegans
Noumeaella rubrofasciata
Jorunna parva
Coryphellina lotos
Pelagella longicornis
Diversidoris flava
Doto columbiana
Phyllodesmium tuberculatum
Phyllodesmium iriomotense
Dermatobranchus funiculus
Goniodoridella savignyi
Ancula pacifica
Cyerce kikutarobabai
Hypselodoris bollandi
Phyllidiopsis cardinalis
Janolus incrustans
Hypselodoris violabranchia
Lomanotus vermiformis
Dendrodoris guttata
Cyerce nigricans
Trapania toddi
Doriopsis pecten
Trapania miltabrancha
Tritonia exsulans
Costasiella fridae
Rostanga lutescens
Siphopteron makisig
Trapania kamagong
Fiona pinnata
Doriopsilla rowena
Thorunna australis
Facelina bourailli
Coryphellina delicata
Verconia norba
Phyllodesmium parangatum
Bermudella mija
Trapania tamaraw
Tubulophilinopsis reticulata
Janolus flavoanulatus
Trapania tora
Trapania scurra
Hypselodoris lacuna
Phestilla lugubris
Every member ranked by how many dive sites hold them, with the traits a diver cares about.
| Species | Diver appeal | Findability | Size | Depth | Sites | Status |
|---|---|---|---|---|---|---|
 Sea HareAplysiidae spp. |
| Usually seen |
| – |
| – |
| 6,024 |
| Least concern |
| Sea SlugPleurobranchidae spp. | Easy to miss | – | – | 5,729 | Least concern |
 Jorunna NudibranchJorunna spp. | Easy to miss | – | – | 3,383 | Least concern |
 Light-spotted AegiresAegires punctilucens | – | – | – | 3,168 | Least concern |
| Blue DragonPteraeolidia spp. | Easy to miss | – | – | 3,163 | Least concern |
| Varicose Wart SlugPhyllidia varicosa | Easy to miss | Up to 7 cm | 10-20m | 3,145 | Least concern |
 Chromodoris NudibranchChromodoris spp. | Easy to miss | – | – | 2,203 | Least concern |
| MelibeMelibe spp. | – | – | – | 2,073 | Least concern |
| Cratena SlugCratena peregrina | Easy to miss | – | – | 1,763 | Least concern |
| Mediterranean Violet AeolidFlabellina affinis | Easy to miss | – | – | 1,668 | Least concern |
 Nembrotha NudibranchNembrotha spp. | Easy to miss | – | – | 1,597 | Least concern |
| Elegant PhyllidiaPhyllidia elegans | – | Up to 5 cm | – | 1,509 | Least concern |
| Cow SnailPeltodoris atromaculata | Easy to miss | – | – | 1,383 | Least concern |
 Violet Sea SlugEdmundsella pedata | – | – | – | 1,269 | Least concern |
| Roboastra NudibranchRoboastra spp. | Easy to miss | – | – | 1,267 | Least concern |
| Painted PhyllidiaPhyllidia picta | – | – | – | 1,259 | Least concern |
| Giant DorisFelimare picta | Easy to miss | Up to 6.4 cm | – | 1,125 | Least concern |
| Tricolor DorisFelimare tricolor | Easy to miss | – | – | 1,114 | Least concern |
| Phidiana NudibranchPhidiana spp. | – | – | – | 1,056 | Least concern |
| Lettuce Sea SlugElysia crispata | Easy to miss | Up to 15 cm | – | 1,014 | Least concern |
| Gardiner's NudibranchNotodoris gardineri | – | Up to 8 cm | – | 1,005 | Least concern |
| Giant MonkdragonMelibe viridis | Easy to miss | Up to 12 cm | – | 904 | Least concern |
 Anna's ChromodorisChromodoris annae | – | Up to 2 cm | 15-30m | 854 | Least concern |
| Splendid ElysiaThuridilla hopei | Hard to spot | – | – | 840 | Least concern |
 White FlabellinaLuisella babai | – | – | – | 748 | Least concern |
| Citrus NudibranchNotodoris citrina | – | Up to 6 cm | – | 726 | Least concern |
| Purple-crowned Sea GoddessNeptunazurea kempfi | Easy to miss | – | – | 721 | Least concern |
 Fourline NudibranchPolycera quadrilineata | – | – | – | 676 | Least concern |
| Ocellated Wart SlugPhyllidia ocellata | Usually seen | Up to 6 cm | – | 629 | Least concern |
| Trance Wrinkle DoridNembrotha kubaryana | Easy to miss | Up to 6 cm | – | 625 | Least concern |
 Ischia FlabellinaFlabellina ischitana | – | – | – | 603 | Least concern |
| Heavenly Wart SlugPhyllidia coelestis | Easy to miss | Up to 6 cm | – | 579 | Least concern |
 Red Papillae DoridDiaphorodoris papillata | – | – | – | 574 | Least concern |
 Timid ElysiaElysia timida | – | – | – | 574 | Least concern |
| Black-margined NudibranchDoriprismatica atromarginata | Easy to miss | Up to 9 cm | – | 569 | Least concern |
 Crested AeolisAntiopella cristata | – | – | – | 547 | Least concern |
 Ringed Velvet DoridJorunna funebris | – | Up to 5 cm | – | 500 | Least concern |
 Willan's ChromodorisChromodoris willani | – | Up to 2.5 cm | – | 494 | Least concern |
| Pustular PhyllidiaPhyllidiella pustulosa | Usually seen | Up to 6 cm | – | 493 | Least concern |
| Fontandrau's FelimareFelimare fontandraui | Easy to miss | – | – | 491 | Least concern |
 Loch's ChromodorisChromodoris lochi | – | Up to 3 cm | – | 481 | Least concern |
 Magnificent ChromodorisChromodoris magnifica | – | – | – | 453 | Least concern |
 Krohn's DoridRudmania krohni | – | – | – | 452 | Least concern |
| Geometric Rainbow DoridGoniobranchus geometricus | Easy to miss | – | – | 438 | Least concern |
| Barnacle-eating DoridOnchidoris bilamellata | Hard to spot | Up to 3.8 cm | 0-55m | 429 | Least concern |
 White DiaphorodorisDiaphorodoris alba | – | – | – | 427 | Least concern |
| Clown DorisCeratosoma amoenum | Easy to miss | Up to 6 cm | – | 427 | Least concern |
| Tryon's HypselodorisHypselodoris tryoni | Easy to miss | Up to 10 cm | – | 417 | Least concern |
 Sap-sucking SlugElysia viridis | – | Up to 4.5 cm | 5-20m | 407 | Least concern |
| Grey Sea SlugJorunna tomentosa | Easy to miss | – | – | 368 | Least concern |
 Purple RudmaniaRudmania purpurea | – | – | – | 367 | Least concern |
| Orange-clubbed NudibranchLimacia clavigera | Easy to miss | – | – | 366 | Least concern |
| Desirable FlabellinaCoryphellina exoptata | Easy to miss | – | – | 357 | Least concern |
 Cavolini's FlabellinaFlabellina cavolini | – | – | – | 353 | Least concern |
| Villefranche FelimareFelimare villafranca | Easy to miss | – | – | 342 | Least concern |
 Cantabrian NudibranchFelimare cantabrica | – | – | – | 341 | Least concern |
| Orsini's FelimareFelimare orsinii | Easy to miss | – | – | 338 | Least concern |
| Kunie's GoniobranchusGoniobranchus kuniei | Easy to miss | Up to 5 cm | – | 321 | Least concern |
| Blue-spotted Wrinkle DoridTambja morosa | Easy to miss | Up to 7 cm | – | 317 | Least concern |
 Crested NembrothaNembrotha cristata | – | Up to 12 cm | – | 311 | Least concern |
| Monterey DoridDoris montereyensis | Easy to miss | Up to 15 cm | 0-28m | 308 | Least concern |
 Bushy PhyllodesmiumPhyllodesmium briareum | – | Up to 2.5 cm | 8-20m | 307 | Least concern |
 Lady GodivaNemesignis banyulensis | – | – | – | 306 | Least concern |
 Boston FacelinaFacelina bostoniensis | – | Up to 3.9 cm | 2-37m | 304 | Least concern |
 Striped Pyjama NudibranchChromodoris quadricolor | – | Up to 4.5 cm | – | 303 | Least concern |
| Lavender Split-tooth DoridHypselodoris bullockii | Easy to miss | Up to 4 cm | – | 295 | Least concern |
| Sunrise Tentacle AeolidCaloria indica | Easy to miss | Up to 5 cm | – | 291 | Least concern |
 Scribbled NudibranchDoriopsilla areolata | – | – | – | 286 | Least concern |
 Lovely Headshield SlugChelidonura amoena | – | Up to 5 cm | – | 283 | Least concern |
 Lined NembrothaNembrotha lineolata | – | Up to 4.5 cm | – | 280 | Least concern |
 Pepper-and-salt SlugCaloria elegans | – | – | – | 270 | Least concern |
 Miller's NembrothaNembrotha milleri | – | – | – | 262 | Least concern |
 Sea LemonArchidoris pseudoargus | – | – | – | 261 | Least concern |
| Batangas HalgerdaHalgerda batangas | Easy to miss | – | – | 258 | Least concern |
 Chamberlain's NembrothaNembrotha chamberlaini | – | Up to 7 cm | – | 250 | Least concern |
| Harlequin Sea GoddessFelimida binza | Easy to miss | Up to 3 cm | – | 250 | Least concern |
 Slender FacelinaFacelina auriculata | – | – | – | 248 | Least concern |
 Morrow's TrinchesiaTrinchesia morrowae | – | – | – | 248 | Least concern |
 Papillose CrimoraCrimora papillata | – | – | – | 245 | Least concern |
| Coi's GoniobranchusGoniobranchus coi | Easy to miss | – | – | 241 | Least concern |
 Tri-banded Taco SlugElysia marginata | – | – | – | 237 | Least concern |
 Red-striped FacelinaFacelina rubrovittata | – | – | – | 233 | Least concern |
| Double-lined Sea SlugFelimare bilineata | Easy to miss | – | – | 230 | Least concern |
 Chestnut Pump DoridPelagella castanea | – | – | – | 229 | Least concern |
| San Diego DoridDiaulula sandiegensis | Easy to miss | Up to 8 cm | 0-28m | 228 | Least concern |
 Yellow-dotted DorisFelimida luteorosea | – | – | – | 227 | Least concern |
 Warty DoridDoris verrucosa | – | Up to 7 cm | 0-12m | 223 | Least concern |
| T-bar SwallowtailChelidonura hirundinina | Easy to miss | Up to 2 cm | – | 222 | Least concern |
 Spanish ShawlFlabellinopsis iodinea | Easy to miss | – | – | 220 | Least concern |
 Hairy Spiny DorisAcanthodoris pilosa | – | Up to 2 cm | 0-55m | 220 | Least concern |
 Noble DoridPeltodoris nobilis | Easy to miss | – | – | 219 | Least concern |
 Quatrefages' CaloriaCaloria quatrefagesi | – | – | – | 218 | Least concern |
 Flattened GeitodorisGeitodoris planata | – | Up to 4.1 cm | 91-267m | 211 | Least concern |
| Northern Leopard DoridDiaulula odonoghuei | Easy to miss | – | – | 210 | Least concern |
| HermissendaHermissenda crassicornis | Easy to miss | Up to 7 cm | – | 208 | Least concern |
| Painted ThecaceraThecacera picta | Easy to miss | Up to 10 mm | – | 208 | Least concern |
| Dottyback Split-tooth DoridHypselodoris pulchella | Easy to miss | Up to 11 cm | – | 205 | Least concern |
 Alcala's ChromodorisChromodoris alcalai | – | – | 2-77m | 204 | Least concern |
 Slender EolisCoryphella gracilis | – | Up to 15 mm | – | 198 | Least concern |
| ThecaceraThecacera pennigera | Easy to miss | Up to 2 cm | – | 198 | Least concern |
 Bushy-backed NudibranchDendronotus frondosus | – | Up to 3 cm | – | 197 | Least concern |
 Cornish PolyceraPolycera kernowensis | – | – | – | 192 | Least concern |
| White-spotted Yellow NudibranchPhyllidia flava | Easy to miss | – | – | 192 | Least concern |
| Cinderella Sea SlugHypselodoris apolegma | Easy to miss | – | – | 190 | Least concern |
| Nanaimo DoridAcanthodoris nanaimoensis | Hard to spot | Up to 2.5 cm | – | 188 | Least concern |
 Forskal's Sidegilled SlugPleurobranchus forskalii | – | – | – | 187 | Least concern |
| Opalescent NudibranchHermissenda opalescens | – | – | – | 187 | Least concern |
 Red-fingered CoryphellaCoryphella verrucosa | – | Up to 6 cm | – | 182 | Least concern |
 Whip Fan NudibranchCandiella odhneri | – | – | – | 179 | Least concern |
 Pico GoniodoridellaGoniodoridella picoensis | – | – | – | 179 | Least concern |
 Porites-eating NudibranchPhestilla sibogae | – | – | – | 179 | Least concern |
| Red Sponge DoridRostanga pulchra | Hard to spot | Up to 9 mm | 102m | 178 | Least concern |
 Blue Velvet Headshield SlugChelidonura varians | – | Up to 3 cm | – | 175 | Least concern |
 Mexican DancerElysia diomedea | – | Up to 10 cm | – | 171 | Least concern |
| Splendid GoniobranchGoniobranchus splendidus | Easy to miss | – | – | 170 | Least concern |
 Dendrodoris GunnamattaDendrodoris krusensternii | – | – | – | 170 | Least concern |
 Filomena's AeolidiaAeolidia filomenae | – | – | – | 168 | Least concern |
| Caramel NudibranchGlossodoris rufomarginata | Easy to miss | Up to 5 cm | – | 167 | Least concern |
 Johnston's Balloon EolisTergipes tergipes | – | – | – | 167 | Least concern |
 Shag-rug AeolisAeolidia papillosa | – | Up to 10 cm | 0-380m | 166 | Least concern |
| White-lined DironaDirona albolineata | Easy to miss | Up to 18 cm | 0-28m | 166 | Least concern |
| Fiesta Rainbow DoridGoniobranchus fidelis | Easy to miss | Up to 4 cm | – | 164 | Least concern |
| Psychedelic BatwingSagaminopteron psychedelicum | Easy to miss | Up to 2 cm | – | 163 | Least concern |
 Heron ArdeadorisArdeadoris egretta | – | Up to 11 cm | 1-1014m | 163 | Least concern |
| Elongate Pantechnicon DoridCeratosoma tenue | Easy to miss | Up to 11 cm | – | 162 | Least concern |
 Naples SpurillaSpurilla neapolitana | – | Up to 7 cm | 0-3m | 162 | Least concern |
| Short-tailed CeratosomaCeratosoma brevicaudatum | Easy to miss | Up to 15 cm | – | 160 | Least concern |
| Bennett's HypselodorisHypselodoris bennetti | Easy to miss | Up to 3 cm | – | 160 | Least concern |
 California ChromodoridFelimare californiensis | – | – | – | 159 | Least concern |
 NavanaxNavanax inermis | – | Up to 23 cm | – | 158 | Least concern |
 Three-lined AeolidOrienthella trilineata | Hard to spot | – | – | 156 | Least concern |
 Shireen's PhyllidiopsisPhyllidiopsis shireenae | – | Up to 11 cm | – | 153 | Least concern |
 Fried Egg NudibranchDiaphorodoris luteocincta | – | – | – | 150 | Least concern |
 Tartan TrapaniaTrapania tartanella | – | – | – | 149 | Least concern |
 La Linea AmphorinaAmphorina linensis | – | – | – | 148 | Least concern |
 Corange-tip CuthonaCatriona aurantia | – | – | – | 148 | Least concern |
| Leopard ChromodorisGoniobranchus leopardus | Easy to miss | – | – | 145 | Least concern |
 Angular SeaslugOkenia nodosa | – | – | – | 144 | Least concern |
 Bergh's DorisDoris berghi | – | – | – | 143 | Least concern |
 Two-tone BluntnoseSamla bicolor | – | – | – | 141 | Least concern |
 Stripete TritoniaTrapania lineata | – | – | – | 136 | Least concern |
| Gold Line Sea GoddessFelimare ruthae | Easy to miss | Up to 2.7 cm | – | 134 | Least concern |
 Neat AeolidFiocuthona concinna | – | – | – | 134 | Least concern |
 Four-lined Wart SlugPhyllidia alyta | – | – | – | 133 | Least concern |
 Coronate DotoDoto coronata | – | Up to 15 mm | – | 133 | Least concern |
 Yellow-plumed Sea SlugBerthella plumula | – | – | – | 128 | Least concern |
| Mushroom Coral ReticulidaReticulidia fungia | Easy to miss | Up to 4 cm | – | 123 | Least concern |
 Streaked ChromodorisChromodoris strigata | – | – | – | 122 | Least concern |
 Blue TrinchesiaTrinchesia caerulea | – | Up to 10 mm | – | 122 | Least concern |
 Dendritic NudibranchPlacida dendritica | – | – | 0-10m | 121 | Least concern |
 Rough DorisOnchidoris muricata | – | Up to 14 mm | 0-64m | 120 | Least concern |
| Atlantic Sea SwallowGlaucus atlanticus | Easy to miss | Up to 4 cm | – | 116 | Least concern |
 Chocolate Waffle DoridHalgerda wasinensis | – | – | – | 116 | Least concern |
 Coleman's ChromodorisChromodoris colemani | – | Up to 2.5 cm | 3-11m | 116 | Least concern |
| Sorcerer's DoridPolycera atra | Hard to spot | Up to 2.2 cm | – | 115 | Least concern |
 Striped FjordiaCoryphella lineata | – | – | – | 115 | Least concern |
 White AeolisFavorinus branchialis | – | – | 5-20m | 115 | Least concern |
 Glassy JanolusJanolus hyalinus | – | – | – | 114 | Least concern |
| Imperial NudibranchHypselodoris imperialis | Easy to miss | Up to 8 cm | – | 114 | Least concern |
| Banana NudibranchNotodoris minor | Easy to miss | Up to 9 cm | – | 112 | Least concern |
 Peach SeaslugBerthellina edwardsii | – | – | – | 110 | Least concern |
 Ringed Sap-sucking SlugPlakobranchus ocellatus | – | Up to 4 cm | – | 109 | Least concern |
 Gordana's ElysiaElysia gordanae | – | – | – | 106 | Least concern |
 Angular Wart SlugPhyllidiella zeylanica | – | Up to 6 cm | – | 104 | Least concern |
 Black-horned Egg-eaterFavorinus tsuruganus | – | – | – | 103 | Least concern |
 Branched DendronotidDendronotus venustus | Hard to spot | – | – | 103 | Least concern |
| Clown DoridTriopha catalinae | Easy to miss | Up to 7 cm | 0-17m | 102 | Least concern |
 Variable AphelodorisAphelodoris varia | – | Up to 5 cm | 0-20m | 102 | Least concern |
 Bus Stop NudibranchGoniobranchus hintuanensis | – | Up to 16 mm | – | 101 | Least concern |
 White-and-orange-tipped NudibranchAntiopella fusca | – | – | – | 101 | Least concern |
 Turret Velvet DoridJorunna rubescens | – | Up to 17 cm | 0-18m | 101 | Least concern |
 Nodulous AeolidLimenandra nodosa | – | Up to 4 cm | – | 101 | Least concern |
| Salt-and-pepper DoridAegires albopunctatus | Hard to spot | Up to 2.3 cm | – | 100 | Least concern |
| Spotted TriophaTriopha maculata | – | Up to 18 cm | – | 100 | Least concern |
 Secretive ThorunnaThorunna furtiva | – | – | – | 98 | Least concern |
| Slender Ceratosoma NudibranchCeratosoma gracillimum | Easy to miss | Up to 13 cm | – | 98 | Least concern |
 Yellow-spined Wart SlugPhyllidia marindica | – | – | – | 97 | Least concern |
 Crowned NudibranchPolycera capensis | – | Up to 7 cm | 0-30m | 97 | Least concern |
 Bluish BerghiaBerghia coerulescens | – | Up to 4 cm | 1m | 96 | Least concern |
| Roo HypselodorisHypselodoris roo | Easy to miss | – | – | 95 | Least concern |
| Lion NudibranchMelibe leonina | Easy to miss | Up to 9 cm | – | 95 | Least concern |
 Lettuce SlugElysia ornata | – | Up to 4 cm | – | 94 | Least concern |
 Orange-brown AeolidAeolidiella glauca | – | – | – | 94 | Least concern |
| Rabbit Sapsucking SlugCostasiella usagi | Hard to spot | – | – | 94 | Least concern |
| Zephyr HypselodorisHypselodoris zephyra | Easy to miss | – | – | 94 | Least concern |
 Redbrown Leathery DorisPlatydoris argo | – | – | – | 94 | Least concern |
 White Atlantic CadlinaCadlina laevis | – | Up to 3 cm | 0-800m | 94 | Least concern |
 White-speckled DoridDoriopsilla fulva | Easy to miss | – | – | 93 | Least concern |
| Chocolate Mango NudibranchReticulidia halgerda | Easy to miss | Up to 7 cm | – | 93 | Least concern |
 Warty Sea SlugPleurobranchus areolatus | – | Up to 15 cm | – | 91 | Least concern |
| Black-striped Split-tooth DoridHypselodoris nigrostriata | Easy to miss | Up to 4 cm | – | 91 | Least concern |
 Christmas Tree Hydroid NudibranchLearchis poica | – | Up to 2.5 cm | – | 91 | Least concern |
 Sleeved CandiellaCandiella manicata | – | – | – | 91 | Least concern |
 Three-lines Purple DorisMexichromis trilineata | – | – | – | 90 | Least concern |
 Spectacled Rainbow DoridGoniobranchus annulatus | – | – | – | 90 | Least concern |
| Triple-banded Split-tooth DoridHypselodoris decorata | Easy to miss | – | – | 90 | Least concern |
 Cockerell's NudibranchLimacia cockerelli | – | Up to 2.6 cm | – | 90 | Least concern |
| Macfarland's ChromodoridFelimida macfarlandi | Easy to miss | – | – | 89 | Least concern |
 Hopkins' Rose NudibranchCeratodoris rosacea | – | – | – | 89 | Least concern |
 Modest Clown DoridTriopha modesta | – | – | – | 87 | Least concern |
 Fragile DotoDoto fragilis | – | – | – | 87 | Least concern |
 Western ChromodorisChromodoris westraliensis | – | – | – | 86 | Least concern |
 Marten's Sidegill SlugTomoberthella martensi | – | – | – | 86 | Least concern |
 Striped PhyllidiopsisPhyllidiopsis xishaensis | – | – | – | 84 | Least concern |
 Eyespot CostasiellaCostasiella ocellifera | – | Up to 10 mm | 2-10m | 84 | Least concern |
 Eyespot TenelliaTenellia ocellata | – | – | – | 84 | Least concern |
 Nero PorostomeDendrodoris krebsii | – | Up to 3 cm | 0-25m | 83 | Least concern |
| Porter's Blue DragonNeptunazurea porterae | – | – | – | 81 | Least concern |
 Paisley EeldragonBornella anguilla | – | Up to 7 cm | – | 81 | Least concern |
 Translucent CadlinaCadlina pellucida | – | – | – | 80 | Least concern |
 Obscure HypselodorisHypselodoris obscura | – | Up to 4 cm | – | 79 | Least concern |
 Pilsbry's Head Shield SlugTubulophilinopsis pilsbryi | – | – | – | 79 | Least concern |
 Lemon Lolly DorisDoris chrysoderma | – | – | – | 79 | Least concern |
 Graceful Wrinkle DoridRoboastra gracilis | – | Up to 3 cm | 1-5m | 79 | Least concern |
 Mimic BoselliaBosellia mimetica | – | Up to 15 mm | 2m | 78 | Least concern |
 Caramel DoridTaringa telopia | – | Up to 4 cm | – | 78 | Least concern |
| Pink-eared Rainbow DoridGoniobranchus verrieri | Easy to miss | Up to 2 cm | – | 78 | Least concern |
 Homberg's TritonTritonia hombergii | – | – | – | 77 | Least concern |
| Giant Frond-aeolisDendronotus iris | Easy to miss | Up to 20 cm | – | 77 | Least concern |
 White-spotted Sea GoddessDoriopsilla albopunctata | Hard to spot | Up to 4 cm | – | 77 | Least concern |
 Starry Waffle DoridHalgerda indotessellata | – | – | – | 76 | Least concern |
| Collingwood's GoniobranchusGoniobranchus collingwoodi | Easy to miss | Up to 10 cm | – | 75 | Least concern |
 Agassiz's ChromodoridFelimare agassizii | – | – | – | 75 | Least concern |
 Blue StiligerErcolania coerulea | – | – | – | 74 | Least concern |
| Krakatoa HypselodorisHypselodoris krakatoa | Easy to miss | – | – | 74 | Least concern |
 Brazilian AeolidSpurilla braziliana | – | – | – | 74 | Least concern |
 Red-tipped Sea GoddessChromolaichma sedna | – | – | – | 74 | Least concern |
 Jewelled NavanaxNavanax gemmatus | – | – | – | 73 | Least concern |
 Acost's GlossodorisGlossodoris acosti | – | – | – | 73 | Least concern |
 Ornate FacelinidAustraeolis ornata | – | Up to 4 cm | 0-100m | 72 | Least concern |
| T-bar Pantechnicon DoridCeratosoma trilobatum | Easy to miss | Up to 10 cm | – | 72 | Least concern |
 Hamner's TritoniaTritonicula hamnerorum | – | – | – | 72 | Least concern |
| Flame CoryphellinaCoryphellina flamma | Easy to miss | – | – | 71 | Least concern |
 Ornate CadlinellaCadlinella ornatissima | – | Up to 2 cm | 5-12m | 71 | Least concern |
 Marion's FacelinopsisFacelinopsis marioni | – | – | – | 70 | Least concern |
 Rocky AeolidEubranchulus rupium | – | – | – | 70 | Least concern |
 Putnam's LongibranchusLongibranchus putnami | – | – | – | 70 | Least concern |
 Grey Side-grilled SlugPleurobranchaea maculata | – | Up to 10 cm | – | 70 | Least concern |
| Diamond-mask Sap-suckerCostasiella kuroshimae | Hard to spot | – | – | 69 | Least concern |
| Yellow-edged Wart SlugPhyllidia exquisita | Easy to miss | Up to 3 cm | – | 69 | Least concern |
 Black PhyllidiellaPhyllidiella nigra | – | – | – | 69 | Least concern |
 Rose PhyllidiellaPhyllidiella rosans | – | Up to 3.5 cm | – | 68 | Least concern |
 Peron's Sidegill SlugPleurobranchus peronii | – | – | – | 68 | Least concern |
| Starback Tentacled DoridAsteronotus cespitosus | Easy to miss | Up to 22 cm | – | 68 | Least concern |
 Elisabeth's ChromodorisChromodoris elisabethina | – | Up to 4.6 cm | – | 67 | Least concern |
 White AeolidBulbaeolidia alba | – | Up to 7 mm | 1m | 67 | Least concern |
 Anne's PhyllidiopsisPhyllidiopsis annae | – | Up to 15 mm | – | 67 | Least concern |
 Sunset Knobbed DoridAegires villosus | – | Up to 10 mm | – | 66 | Least concern |
| Willey's NudibranchHalgerda willeyi | Easy to miss | Up to 7 cm | – | 66 | Least concern |
| Jolly Green GiantMiamira sinuata | Easy to miss | Up to 5 cm | – | 65 | Least concern |
 Gaudy BabakinaBabakina anadoni | – | Up to 10 mm | – | 65 | Least concern |
 Velvet ElysiaElysia velutinus | – | Up to 4 cm | – | 65 | Least concern |
 Ring-horned FacelinaFacelina annulicornis | – | – | – | 65 | Least concern |
 Fringe-back NudibranchDondice occidentalis | – | Up to 5 cm | – | 65 | Least concern |
 Gasflame NudibranchBonisa nakaza | – | – | – | 64 | Least concern |
 Lined CandiellaCandiella lineata | – | – | – | 63 | Least concern |
 Beau Vallon Magnificent SlugMexichromis multituberculata | – | Up to 3 cm | Up to 12m | 63 | Least concern |
 Verco's NudibranchTambja verconis | – | Up to 13 cm | 0-50m | 63 | Least concern |
| Imperial PlocamopherusPlocamopherus imperialis | Easy to miss | Up to 10 cm | – | 62 | Least concern |
| Double-banded Split-tooth DoridHypselodoris maculosa | Easy to miss | Up to 3 cm | – | 61 | Least concern |
 Variable-gill HypselodorisHypselodoris variobranchia | – | – | – | 61 | Least concern |
 White's HypselodorisHypselodoris whitei | – | – | 3m | 61 | Least concern |
 Atlantic AnculaAncula gibbosa | – | Up to 2.5 cm | – | 61 | Least concern |
 Hudson Spiny DorisAcanthodoris hudsoni | – | Up to 2 cm | – | 60 | Least concern |
 Lined ThuridillaThuridilla lineolata | – | Up to 2 cm | – | 60 | Least concern |
 Ros's GargamellaGargamella rosi | – | – | – | 60 | Least concern |
 Ghost AeolidFlabellina gabinierei | – | – | – | 60 | Least concern |
 Caribbean Red-tipped Sea GoddessChromolaichma hemera | – | – | – | 59 | Least concern |
 McDonald's DoridLimacia mcdonaldi | – | – | – | 59 | Least concern |
 Spotted Foot NudibranchTayuva lilacina | – | – | – | 59 | Least concern |
 Black DendrodorisDendrodoris nigra | – | Up to 8 cm | 0-26m | 59 | Least concern |
 Coodgee ElysiaElysia coodgeensis | – | – | 0-3m | 59 | Least concern |
 Seto GoniobranchusGoniobranchus setoensis | – | – | – | 59 | Least concern |
| Triple-striped Split-tooth DoridHypselodoris emma | Easy to miss | Up to 3 cm | – | 57 | Least concern |
| Hilton's AeolidPhidiana hiltoni | Hard to spot | Up to 5 cm | 0-28m | 57 | Least concern |
 Red RostangaRostanga rubra | – | – | – | 56 | Least concern |
 Strangford TrinchesiaTrinchesia cuanensis | – | – | – | 56 | Least concern |
 Bill Clench's DorisFelimida clenchi | – | – | – | 56 | Least concern |
 Fried Egg Bubble SnailColpodaspis thompsoni | – | – | 3-41m | 56 | Least concern |
 Farran's AmphorinaAmphorina farrani | – | – | – | 56 | Least concern |
| Branched Soft Coral EaterPhyllodesmium poindimiei | Hard to spot | Up to 4 cm | – | 56 | Least concern |
 Kuiter's ChromodorisChromodoris kuiteri | – | Up to 7 cm | – | 56 | Least concern |
 Pelseneer's DoriopsillaDoriopsilla pelseneeri | – | – | – | 56 | Least concern |
 White-tipped NudibranchCratena capensis | – | – | – | 55 | Least concern |
 African CamachoaglajaCamachoaglaja africana | – | – | – | 54 | Least concern |
 Wave Wart SlugPhyllidia undula | – | – | – | 53 | Least concern |
 Fire-gilled Wrinkle DoridNembrotha purpureolineata | – | – | – | 53 | Least concern |
 Krempf's PhyllidiopsisPhyllidiopsis krempfi | – | Up to 7 cm | – | 53 | Least concern |
 Dushia FlabellinaEdmundsella dushia | – | – | – | 52 | Least concern |
 Temperate Soft Coral EaterPhyllodesmium horridum | – | – | – | 52 | Least concern |
 Mazda ThuridillaThuridilla mazda | – | Up to 6 mm | – | 52 | Least concern |
 Beautiful SwallowtailPhilinopsis speciosa | – | – | – | 52 | Least concern |
 Feathered DotoDoto pinnatifida | – | – | – | 51 | Least concern |
 Grand PleurobranchPleurobranchus grandis | – | Up to 21 cm | – | 51 | Least concern |
 Striped CandiellaCandiella striata | – | – | – | 51 | Least concern |
 Painted NudibranchHypselodoris infucata | – | Up to 4 cm | – | 50 | Least concern |
 Black Gilled PhestillaPhestilla melanobrachia | – | Up to 4 cm | – | 50 | Least concern |
 Gold Lace NudibranchHalgerda terramtuentis | – | Up to 5 cm | 0-30m | 50 | Least concern |
 Cape DoridHypselodoris capensis | – | Up to 4 cm | – | 50 | Least concern |
 Bohol NudibranchDiscodoris boholiensis | – | Up to 6 cm | – | 49 | Least concern |
 Josh's ChromodorisChromodoris joshi | – | Up to 6 cm | – | 49 | Least concern |
| Elegant Sapsucking SlugCyerce elegans | Easy to miss | Up to 2 cm | – | 49 | Least concern |
 Halimeda Taco SlugElysia pusilla | – | Up to 3 cm | – | 49 | Least concern |
 Leuckart's AegiresAegires leuckartii | – | – | – | 48 | Least concern |
 Trembling NudibranchGoniobranchus vibratus | – | – | 0-24m | 48 | Least concern |
 Daphne's NudibranchGoniobranchus daphne | – | – | – | 48 | Least concern |
 Papua PlakobranchusPlakobranchus papua | – | – | – | 48 | Least concern |
| Alabaster Rainbow DoridGoniobranchus albonares | Easy to miss | – | – | 48 | Least concern |
 Black CyerceCyerce nigra | – | – | – | 48 | Least concern |
 Chace's BoreoberthellaBoreoberthella chacei | – | – | – | 48 | Least concern |
 Jackson's HypselodorisHypselodoris jacksoni | – | – | – | 47 | Least concern |
 Polka-dot Gobble DoridGymnodoris ceylonica | – | Up to 5 cm | – | 47 | Least concern |
| Pikachu NudibranchThecacera pikachu | Easy to miss | – | – | 47 | Least concern |
 White-lined CratenaCratena lineata | – | Up to 15 mm | 0-18m | 47 | Least concern |
 Gritty DorisGeitodoris heathi | – | Up to 4.3 cm | – | 46 | Least concern |
 Tessellated HalgerdaHalgerda tessellata | – | Up to 3.5 cm | – | 46 | Least concern |
 Sargassum SpurillaSpurilla sargassicola | – | Up to 4 cm | – | 46 | Least concern |
 Fiery Pump DoridOkenia amoenula | – | – | – | 46 | Least concern |
 Pink Sponge VerconiaVerconia haliclona | – | – | – | 46 | Least concern |
| Serena's NotodorisNotodoris serenae | Easy to miss | Up to 10 cm | – | 46 | Least concern |
 Ghost DoridLecithophorus capensis | – | – | – | 45 | Least concern |
 Green LeafsnailOxynoe viridis | – | – | – | 45 | Least concern |
 Variable NudibranchAphelodoris luctuosa | – | – | – | 45 | Least concern |
 Angas's GlossodorisGlossodoris angasi | – | – | – | 44 | Least concern |
 Spotted BerthellaBerthella ocellata | – | – | – | 44 | Least concern |
 Bushy-gilled Sucking DoridDendrodoris arborescens | – | – | – | 44 | Least concern |
 Yellow-edged CadlinaCadlina luteomarginata | – | Up to 4.5 cm | – | 44 | Least concern |
 Pease's NudibranchHypselodoris peasei | – | – | – | 44 | Least concern |
 Carlson's ThuridillaThuridilla carlsoni | – | Up to 2 cm | – | 43 | Least concern |
 Aquafresh Rainbow DoridChromodoris hamiltoni | – | – | – | 43 | Least concern |
 Cape Silvertip FlameAntiopella capensis | – | – | – | 43 | Least concern |
 Minute AeolisNudibranchus exiguus | – | – | – | 43 | Least concern |
 Danielle's NudibranchThorunna daniellae | – | – | – | 43 | Least concern |
 Alder's AeolidiellaAeolidiella alderi | – | – | – | 43 | Least concern |
| Polka-dotted NudibranchPhyllidia polkadotsa | Easy to miss | – | – | 42 | Least concern |
 Knobbly CarminodorisCarminodoris nodulosa | – | – | – | 42 | Least concern |
 Yellow-beaded GrapedragonDoto ussi | – | – | – | 42 | Least concern |
 Coleman's MelibeMelibe colemani | – | – | – | 42 | Least concern |
 Yellow ElysiaElysia flava | – | Up to 2.5 cm | – | 42 | Least concern |
 Inornate GymnodorisGymnodoris inornata | – | – | – | 41 | Least concern |
 Black NudibranchTambja capensis | – | – | Up to 30m | 41 | Least concern |
 Balut DoriprismaticaDoriprismatica balut | – | – | – | 41 | Least concern |
 Red-spotted Rainbow DoridGoniobranchus heatherae | – | – | – | 41 | Least concern |
 Medallion Silvertip FlameAntiopella longidentata | – | – | – | 40 | Least concern |
| Paradisa HypselodorisHypselodoris paradisa | Easy to miss | – | – | 40 | Least concern |
 Fisher's AeolidCoryphella piunca | – | – | – | 40 | Least concern |
 Blue-ringed SwallowtailChelidonura livida | – | Up to 5 cm | – | 40 | Least concern |
 Jakobsen's PhyllodesmiumPhyllodesmium jakobsenae | – | – | – | 40 | Least concern |
 Orange-bobble Gobble DoridGymnodoris impudica | – | – | – | 40 | Least concern |
 Dark Crowned DoridPolycera hedgpethi | – | Up to 4 cm | 0-10m | 40 | Least concern |
 Bordered DendrodorisDendrodoris limbata | – | – | – | 40 | Least concern |
 Viriola AmphorinaAmphorina viriola | – | – | – | 40 | Least concern |
 Black Spotted NudibranchCeratophyllidia papilligera | – | Up to 3 cm | – | 39 | Least concern |
 Diamondback NudibranchTritonia festiva | – | Up to 2 cm | – | 39 | Least concern |
 Yellow-lined TyrannodorisTyrannodoris luteolineata | – | – | – | 39 | Least concern |
 Dubious DoridPalio dubia | – | Up to 12 mm | – | 39 | Least concern |
 Marcus' AeolidCoryphellina marcusorum | – | Up to 2.5 cm | – | 39 | Least concern |
 White-edged NudibranchCoryphella capensis | – | – | – | 39 | Least concern |
 Pallid GlossodorisGlossodoris pallida | – | Up to 3.5 cm | – | 39 | Least concern |
 Military Tentacle AeolidCaloria militaris | – | – | – | 39 | Least concern |
 Ellen's ElysiaElysia ellenae | – | – | – | 39 | Least concern |
| Yellow Dragon Lobe-margin DoridMiamira moloch | Easy to miss | – | – | 38 | Least concern |
 Boodlea SapsuckerErcolania boodleae | – | Up to 14 mm | – | 38 | Least concern |
 Pikachu Longhorn DoridThecacera pacifica | – | Up to 3.5 cm | – | 38 | Least concern |
 Vermilion-striped TenelliaTenellia miniostriata | – | – | – | 38 | Least concern |
 Painted ElysiaThuridilla picta | – | Up to 16 mm | – | 38 | Least concern |
 Simple Rainbow DoridVerconia simplex | – | – | – | 38 | Least concern |
 Koehler's PhyllodesmiumPhyllodesmium koehleri | – | – | – | 37 | Least concern |
 Warty PleurobranchPleurobranchaea bubala | – | – | – | 37 | Least concern |
 Ornate PinstripeDermatobranchus ornatus | – | Up to 7 cm | – | 37 | Least concern |
 Black-spotted SagaminopteronSagaminopteron nigropunctatum | – | – | – | 35 | Least concern |
 Large Warted Sea SlugDoris fontainii | – | Up to 12 cm | – | 35 | Least concern |
 Kahuna NudibranchThorunna kahuna | – | – | – | 35 | Least concern |
 Blackburn's CyerceCyerce blackburnae | – | – | – | 35 | Least concern |
 Black-necked DotoDoto cervicenigra | – | – | – | 35 | Least concern |
 White-centred Rainbow DoridArdeadoris angustolutea | – | – | – | 35 | Least concern |
 Chris Kauge's CoryphellaCoryphella chriskaugei | – | – | – | 34 | Least concern |
 Fleshy DoriopsillaDoriopsilla carneola | – | Up to 2 cm | – | 34 | Least concern |
 Horned ElysiaElysia cornigera | – | Up to 15 mm | – | 34 | Least concern |
 Orange-spotted NanucaNanuca sebastiani | – | Up to 12 mm | – | 34 | Least concern |
 Faroe PolyceraPolycera faeroensis | – | – | – | 34 | Least concern |
 Brown-blotched OkeniaBermudella brunneomaculata | – | – | – | 34 | Least concern |
 Crimson HermaeaHermaea bifida | – | Up to 2 cm | – | 33 | Least concern |
 Sandra Millen's UnidentiaUnidentia sandramillenae | – | – | – | 33 | Least concern |
 Blue Dorid NudibranchHypselodoris festiva | – | – | – | 33 | Least concern |
 Miraculous Egg-eaterFavorinus mirabilis | – | – | – | 33 | Least concern |
 Tufted TritonopsisTritoniopsis frydis | – | Up to 2 cm | – | 33 | Least concern |
 Katia's CyerceCyerce katiae | – | – | – | 33 | Least concern |
 MarioniaMarionia blainvillea | – | – | – | 33 | Least concern |
 Rüppell's Wart SlugPhyllidia rueppelii | – | – | – | 32 | Least concern |
 Yellow Skirt SlugOkenia elegans | – | – | – | 32 | Least concern |
 Cat AglajaNakamigawaia felis | – | Up to 12 mm | 1-18m | 32 | Least concern |
 Green/gold TulariaTularia bractea | – | – | – | 32 | Least concern |
 Dotted Bristle Sea SlugDiaulula punctuolata | – | Up to 10 cm | – | 32 | Least concern |
 Timor NembrothaNembrotha lorosae | – | – | – | 32 | Least concern |
 Phoenician CoryphellinaCoryphellina poenicia | – | – | – | 32 | Least concern |
 Kelp Orange-clubbed DoridLimacia jellyi | – | – | – | 31 | Least concern |
 Warty Shag-rug NudibranchAeolidia loui | – | – | – | 31 | Least concern |
 Tasmanian GoniobranchusGoniobranchus tasmaniensis | – | – | – | 31 | Least concern |
 Coral NudibranchPhyllodesmium serratum | – | Up to 3.5 cm | 0-30m | 31 | Least concern |
 Kalawakan ChromodorisChromodoris kalawakan | – | – | – | 30 | Least concern |
| Remarkable JasonJason mirabilis | Easy to miss | Up to 5.5 cm | – | 30 | Least concern |
 Gorgeous Triple-toothFlabellina funeka | – | – | – | 30 | Least concern |
 Florida DotoDoto floridicola | – | – | – | 30 | Least concern |
 Wasp Rainbow DoridGlossodoris bonwanga | – | – | – | 30 | Least concern |
| Marie's MexichromisMexichromis mariei | Easy to miss | – | – | 30 | Least concern |
 Meadow ElysiaElysia pratensis | – | – | – | 29 | Least concern |
 Multicoloured Anemone EaterBaeolidia moebii | – | – | – | 29 | Least concern |
 Long-tailed CoryphellaCoryphella longicaudata | – | – | – | 29 | Least concern |
 Strawberry RostangaRostanga arbutus | – | – | – | 29 | Least concern |
 Cameron DorisDoris cameroni | – | – | – | 29 | Least concern |
 Antilles OxynoeOxynoe antillarum | – | – | – | 29 | Least concern |
 Golden NoumeaDiversidoris crocea | – | – | – | 29 | Least concern |
 Small DotoDoto pita | – | Up to 7 mm | – | 29 | Least concern |
 African Rainbow DoridChromodoris africana | – | Up to 6.5 cm | – | 29 | Least concern |
 Leal's NanucaNanuca leali | – | – | – | 29 | Least concern |
 Longhorn AustraeolisAustraeolis catina | – | Up to 7 mm | – | 29 | Least concern |
 Brown-speckled AphelodorisAphelodoris antillensis | – | – | – | 29 | Least concern |
 Orange-barred MexichromisMexichromis macropus | – | Up to 3 cm | – | 28 | Least concern |
 Eveline's LearchisLearchis evelinae | – | – | – | 28 | Least concern |
 Opalescent PhyllodesmiumPhyllodesmium opalescens | – | – | – | 28 | Least concern |
 Tom Smith's NudibranchArdeadoris tomsmithi | – | – | – | 27 | Least concern |
 Reef Orange-clubbed DoridLimacia lucida | – | – | – | 27 | Least concern |
| Pancake Lobe-margin DoridMiamira miamirana | Easy to miss | Up to 13 cm | – | 27 | Least concern |
 Norwegian PolyceraPolycera norvegica | – | – | – | 27 | Least concern |
 Yellow-gilled Sea GoddessDoriopsilla gemela | – | Up to 4 cm | – | 27 | Least concern |
 Santa Barbara JanolusAntiopella barbarensis | – | Up to 5 cm | – | 27 | Least concern |
 Mimic NudibranchPhyllodesmium rudmani | – | – | – | 27 | Least concern |
 Thompson's GoniobranchusGoniobranchus thompsoni | – | – | – | 26 | Least concern |
| Solar-powered NudibranchPhyllodesmium longicirrum | Hard to spot | Up to 14 cm | – | 26 | Least concern |
 Blue-ringed Rainbow DoridGoniobranchus geminus | – | Up to 6 cm | – | 26 | Least concern |
 Red-ringed ArdeadorisArdeadoris rubroannulata | – | – | – | 26 | Least concern |
 Epicurius GoniobranchusGoniobranchus epicurius | – | – | – | 26 | Least concern |
 Jibacoa ElysiaElysia jibacoaensis | – | – | – | 26 | Least concern |
 Ridged GymnodorisGymnodoris crocea | – | – | – | 26 | Least concern |
 Chinese GoniobranchusGoniobranchus sinensis | – | – | – | 25 | Least concern |
 Sylvia Earle's CadlinaCadlina sylviaearleae | – | – | – | 25 | Least concern |
 White-spotted ThuridillaThuridilla albopustulosa | – | – | – | 25 | Least concern |
 Spotted Swallowtail SlugChelidonura alisonae | – | – | – | 25 | Least concern |
 Carlson's HalgerdaHalgerda carlsoni | – | Up to 5 cm | – | 25 | Least concern |
 Leather Backed DorisPlatydoris angustipes | – | – | – | 25 | Least concern |
 Verco's VerconiaVerconia verconis | – | Up to 4.5 cm | – | 25 | Least concern |
 Oriental NudibranchChromodoris orientalis | – | – | – | 25 | Least concern |
 Diana's ChromodorisChromodoris dianae | – | – | – | 24 | Least concern |
 Red-ringed BluntnoseSamla bilas | – | – | – | 24 | Least concern |
 Galápagos Blue BeautyTambja mullineri | – | Up to 4 cm | – | 24 | Least concern |
 Purple-edged NudibranchGoniobranchus albopustulosus | – | – | – | 24 | Least concern |
 Zuleica's ElysiaElysia zuleicae | – | Up to 17 mm | – | 24 | Least concern |
 Milky Way Sap SuckerThuridilla moebii | – | – | – | 24 | Least concern |
 Engel's FlabellinaLuisella engeli | – | – | – | 23 | Least concern |
 Yellow-spotted CadlinaCadlina flavomaculata | – | Up to 15 mm | – | 23 | Least concern |
 Katherine's HypselodorisHypselodoris katherinae | – | – | – | 23 | Least concern |
 Woodward's GoniobranchusGoniobranchus woodwardae | – | – | – | 22 | Least concern |
 Freddie Mercury's DondiceDondice freddiemercuryi | – | – | – | 22 | Least concern |
 Precious ChromodorisGoniobranchus preciosus | – | – | – | 22 | Least concern |
 Papillose ElysiaElysia papillosa | – | Up to 3.5 cm | – | 22 | Least concern |
 Violet HypselodorisHypselodoris violacea | – | – | – | 22 | Least concern |
 Painted DironaDirona picta | – | Up to 3 cm | – | 22 | Least concern |
 Orange Dragon SlugBornella calcarata | – | Up to 6.5 cm | – | 22 | Least concern |
 Doughnut DotoDoto greenamyeri | – | – | – | 22 | Least concern |
 White TenelliaTenellia puti | – | – | – | 21 | Least concern |
 Blood Spot DorisAldisa sanguinea | – | Up to 2 cm | – | 21 | Least concern |
 Rustic AeolidEubranchus rustyus | – | Up to 2.5 cm | – | 21 | Least concern |
 Maria Gorda CamachoaglajaCamachoaglaja mariagordae | – | – | – | 21 | Least concern |
 Freckled Soft Coral EaterPhyllodesmium macphersonae | – | – | – | 21 | Least concern |
 Souverbie's LobigerLobiger souverbii | – | Up to 15 mm | – | 21 | Least concern |
 Saint Vincent's NudibranchHypselodoris saintvincentius | – | – | – | 21 | Least concern |
 Hill's PleurobranchusPleurobranchus hilli | – | Up to 30 cm | – | 21 | Least concern |
 Hammerhead DotoDoto amyra | – | Up to 14 mm | – | 20 | Least concern |
 Sea Whip SlugTritonicula wellsi | – | Up to 10 mm | – | 20 | Least concern |
 Beaded Soft Coral EaterPhyllodesmium crypticum | – | – | – | 20 | Least concern |
 Wellington ArchidorisDoris wellingtonensis | – | Up to 20 cm | – | 20 | Least concern |
 Tsuruga MariaglajaMariaglaja tsurugensis | – | Up to 2 cm | – | 20 | Least concern |
 Branched Sea SlugKaloplocamus ramosus | – | – | – | 20 | Least concern |
 Inkspot Pantechnicon DoridCeratosoma ingozi | – | – | – | 19 | Least concern |
 Olive DoridTambja olivaria | – | Up to 6 cm | – | 19 | Least concern |
 Orange GumdropBerthellina delicata | – | – | – | 19 | Least concern |
 Queen Split-tooth DoridHypselodoris regina | – | – | – | 19 | Least concern |
 White DendronotidDendronotus albus | – | Up to 3.5 cm | – | 19 | Least concern |
 Headband Headshield SlugMariaglaja inornata | – | Up to 4 cm | – | 19 | Least concern |
 Fried-egg CarminodorisCarminodoris estrelyado | – | – | – | 19 | Least concern |
 Fine-lined TambjaTambja tenuilineata | – | – | – | 18 | Least concern |
 Black-margined Sea SlugElysia expansa | – | – | – | 18 | Least concern |
 Golden DironaDirona pellucida | – | – | – | 18 | Least concern |
 Blue-speckled Sucking DoridDendrodoris caesia | – | – | – | 18 | Least concern |
 Weber's PleurobranchusPleurobranchus weberi | – | – | – | 18 | Least concern |
| Starry DoriprismaticaDoriprismatica stellata | Easy to miss | – | – | 18 | Least concern |
 Odhner's DicataDicata odhneri | – | – | – | 18 | Least concern |
 Fellow's NudibranchHiatodoris fellowsi | – | – | – | 18 | Least concern |
 Four-colour NudibranchGodiva quadricolor | – | Up to 3 cm | – | 18 | Least concern |
 Brown TrapaniaTrapania brunnea | – | – | 0-20m | 18 | Least concern |
 Purple-spotted HypselodorisHypselodoris purpureomaculosa | – | – | – | 17 | Least concern |
 White Night DorisDoris odhneri | – | Up to 20 cm | – | 17 | Least concern |
 Enteromorpha-eating SapsuckerAplysiopsis enteromorphae | – | Up to 2.5 cm | – | 17 | Least concern |
 Emerald SlugSacoproteus smaragdinus | – | Up to 2 cm | – | 17 | Least concern |
 Three-color PolyceraPolycera tricolor | – | Up to 2 cm | – | 17 | Least concern |
 Tina CuthonaCuthona tina | – | Up to 5 mm | – | 17 | Least concern |
| Large-flowered DendrodorisDendrodoris grandiflora | Easy to miss | – | – | 17 | Least concern |
 Ines's LimaciaLimacia inesae | – | – | – | 17 | Least concern |
 Spitfire Tentacle AeolidPruvotfolia rhodopos | – | – | – | 17 | Least concern |
 Yellow-ribbed MiamiraMiamira flavicostata | – | – | – | 17 | Least concern |
 Decorated ThuridillaThuridilla decorata | – | – | – | 17 | Least concern |
 Crawford's RostangaRostanga crawfordi | – | – | – | 16 | Least concern |
 Olive's AeolidAnteaeolidiella oliviae | – | – | – | 16 | Least concern |
 Zemi ElysiaElysia zemi | – | – | – | 16 | Least concern |
 Predaceous AeolisCoryphella trophina | – | Up to 5 cm | – | 16 | Least concern |
 Rose-pink CuthonaCuthona divae | – | Up to 18 mm | – | 16 | Least concern |
 Oasis BulbaeolidiaBulbaeolidia oasis | – | – | – | 16 | Least concern |
 Gardiner's Headshield SlugTubulophilinopsis gardineri | – | Up to 4 cm | – | 16 | Least concern |
 False DorisAdalaria proxima | – | Up to 2 cm | – | 16 | Least concern |
 Pastel Rainbow DoridGlossodoris hikuerensis | – | Up to 8 cm | – | 16 | Least concern |
 Dusky DotoDoto furva | – | – | – | 15 | Least concern |
 Coleman's PhyllodesmiumPhyllodesmium colemani | – | – | – | 15 | Least concern |
 Gabriela's TambjaTambja gabrielae | – | – | – | 15 | Least concern |
 Magnificent Soft Coral EaterPhyllodesmium magnum | – | Up to 13 cm | – | 15 | Least concern |
 Mosaic PleurobranchPleurobranchus albiguttatus | – | – | – | 15 | Least concern |
 Ward's NudibranchNotobryon wardi | – | Up to 3.5 cm | Up to 15m | 15 | Least concern |
 Andalusian BaenopsisBaenopsis baetica | – | – | – | 15 | Least concern |
 Scott's ArminaArmina scotti | – | – | – | 15 | Least concern |
 Honey CeratodorisCeratodoris mellita | – | – | – | 15 | Least concern |
 Rudman's PhyllidiellaPhyllidiella rudmani | – | Up to 6 cm | – | 15 | Least concern |
 Porcupine DoridDiaphorodoris lirulatocauda | – | Up to 12 mm | – | 15 | Least concern |
 Starburst Sucking DoridDendrodoris elongata | – | – | – | 14 | Least concern |
 Colourful AeolidAnteaeolidiella chromosoma | – | – | – | 14 | Least concern |
 Lemon NudibranchDendrodoris citrina | – | – | – | 14 | Least concern |
 Dainty Rainbow DoridGoniobranchus conchyliatus | – | – | – | 14 | Least concern |
 California ArminaArmina californica | – | Up to 7 cm | 0-260m | 14 | Least concern |
 Urak DotoDoto urak | – | – | – | 14 | Least concern |
 Gold-margined GoniobranchusGoniobranchus aureomarginatus | – | – | – | 14 | Least concern |
 Fine-lined TubulophilinopsisTubulophilinopsis lineolata | – | – | – | 14 | Least concern |
 Frilled NudibranchLeminda millecra | – | – | – | 14 | Least concern |
 Gold-fringed CerberillaCerberilla potiguara | – | – | – | 13 | Least concern |
 Blue-spotted DermatobranchusDermatobranchus caeruleomaculatus | – | – | – | 13 | Least concern |
 White Mantle GlossodorisGlossodoris buko | – | – | – | 13 | Least concern |
 Glassy FavorinusFavorinus vitreus | – | – | – | 13 | Least concern |
 Slender Sap Sucking SlugThuridilla gracilis | – | Up to 2 cm | – | 13 | Least concern |
 Whorled PlacidaPlacida verticilata | – | Up to 4 mm | – | 13 | Least concern |
 Fabled GoniobranchusGoniobranchus fabulus | – | – | 3-15m | 13 | Least concern |
 Stearns' AeolidAustraeolis stearnsi | – | Up to 2.4 cm | – | 13 | Least concern |
 Red-tipped EubranchusProdunga rubropunctata | – | – | – | 12 | Least concern |
 Striped GymnodorisGymnodoris striata | – | Up to 5.5 cm | – | 12 | Least concern |
 Kyle's OxynoeOxynoe kylei | – | – | – | 12 | Least concern |
 Nippled PalisaPalisa papillata | – | Up to 16 mm | – | 12 | Least concern |
 Flattened IdaliadorisIdaliadoris depressa | – | – | – | 12 | Least concern |
 Pom-pom TaringaTaringa halgerda | – | – | – | 12 | Least concern |
 Flowering ThorunnaThorunna florens | – | – | – | 11 | Least concern |
 Sandy Bead-noseNoumeaella rehderi | – | – | – | 11 | Least concern |
 Thelma's TenelliaTenellia thelmae | – | – | – | 11 | Least concern |
 Ridged Granulated DoridAtagema intecta | – | Up to 6 cm | – | 11 | Least concern |
 Hidden ArminaArmina occulta | – | – | – | 11 | Least concern |
 Madeira PlocamopherusPlocamopherus maderae | – | – | – | 11 | Least concern |
 Maritime HypselodorisHypselodoris maritima | – | – | – | 11 | Least concern |
 Tiger SiphopteronSiphopteron tigrinum | – | – | – | 11 | Least concern |
 Black-tipped Spiny DorisAcanthodoris rhodoceras | – | Up to 2.8 cm | – | 11 | Least concern |
 Baba's Festive AeolidBabakina festiva | – | Up to 2 cm | – | 11 | Least concern |
 Jewel ThuridillaThuridilla ratna | – | – | – | 11 | Least concern |
 Greenish MarioniopsisMarioniopsis viridescens | – | – | – | 11 | Least concern |
 Leopard PleurobranchEuselenops luniceps | – | Up to 7 cm | – | 11 | Least concern |
 Price's AeolidApata pricei | – | – | – | 11 | Least concern |
 The Limbaugh's CadlinaCadlina limbaughorum | – | Up to 3.1 cm | – | 10 | Least concern |
 Pacific Batwing SeaslugGastropteron pacificum | – | Up to 4 cm | – | 10 | Least concern |
 Variable Granulated DoridSclerodoris tuberculata | – | – | – | 10 | Least concern |
 Slug-shaped MartadorisMartadoris limaciformis | – | – | – | 10 | Least concern |
 Celina's ChromodorisChromodoris celinae | – | – | – | 10 | Least concern |
 Bushy LacedragonMarioniopsis arborescens | – | – | – | 10 | Least concern |
 Three-coloured AglajaAglaja tricolorata | – | – | – | 10 | Least concern |
 Stubby DendronotusDendronotus subramosus | – | Up to 3.3 cm | – | 10 | Least concern |
 White-speckled Headshield SlugBiuve fulvipunctata | – | Up to 2.5 cm | – | 10 | Least concern |
 Acute KaloplocamusKaloplocamus acutus | – | – | – | 10 | Least concern |
 Miquel's MelanochlamysMelanochlamys miqueli | – | – | – | 10 | Least concern |
 Dappled Pump DoridTrapania euryeia | – | – | – | 9 | Least concern |
 Mokohinau JanolusJanolus mokohinau | – | – | – | 9 | Least concern |
 Greek CyerceCyerce graeca | – | – | – | 9 | Least concern |
 Chacmol Bat-wing Sea SlugGastropteron chacmol | – | Up to 10 mm | – | 9 | Least concern |
 Showman Wrinkle DoridNembrotha aurea | – | – | – | 9 | Least concern |
 Solanderia AeolidPleurolidia juliae | – | – | – | 9 | Least concern |
 Neapolitan IdaliadorisIdaliadoris neapolitana | – | – | – | 9 | Least concern |
 Two-spot ThordisThordisa bimaculata | – | Up to 3.2 cm | – | 9 | Least concern |
 Hunter's GoniobranchusGoniobranchus hunterae | – | – | – | 9 | Least concern |
 Woolly AlloiodorisAlloiodoris lanuginata | – | – | – | 9 | Least concern |
 Benn's TrapaniaTrapania benni | – | – | – | 9 | Least concern |
 Willan's PhyllidiaPhyllidia willani | – | – | – | 9 | Least concern |
 Skyler's HypselodorisHypselodoris skyleri | – | – | – | 9 | Least concern |
 Royal CabangusCabangus regius | – | – | – | 9 | Least concern |
 Glassy PhyllodesmiumPhyllodesmium hyalinum | – | – | – | 9 | Least concern |
 White-crusted AeolidTenellia albocrusta | – | – | – | 9 | Least concern |
 Avern's ArdeadorisArdeadoris averni | – | – | – | 8 | Least concern |
 Nakapila TenelliaTenellia nakapila | – | – | – | 8 | Least concern |
 Spotted PleurobranchPleurobranchaea brockii | – | – | – | 8 | Least concern |
 Loring's GoniobranchusGoniobranchus loringi | – | – | – | 8 | Least concern |
 Scorched MurphydorisMurphydoris adusta | – | – | – | 8 | Least concern |
 Neon ThuridillaThuridilla neona | – | Up to 2 cm | – | 8 | Least concern |
 Exceptional JanolusJanolus eximius | – | – | – | 8 | Least concern |
 Iba HypselodorisHypselodoris iba | – | – | – | 8 | Least concern |
 Steinberg's CorambeCorambe steinbergae | – | Up to 17 mm | – | 8 | Least concern |
 Panther JorunnaJorunna pantherina | – | Up to 2.5 cm | – | 8 | Least concern |
 Buttery Taco SlugThuridilla vataae | – | – | – | 8 | Least concern |
 Orange BlobPleurobranchaea californica | – | Up to 21 cm | – | 8 | Least concern |
 Dark DotoDoto kya | – | Up to 10 mm | – | 8 | Least concern |
 Spotted RoundheadEubranchus ocellatus | – | – | – | 8 | Least concern |
 Mulliner's NembrothaNembrotha mullineri | – | – | – | 7 | Least concern |
 Spongy AtagemaAtagema spongiosa | – | – | – | 7 | Least concern |
 Cooper's AeolidCoryphella cooperi | – | Up to 2.5 cm | – | 7 | Least concern |
 Livingstone's NembrothaNembrotha livingstonei | – | Up to 4 cm | – | 7 | Least concern |
 Blue-banded Pump DoridTrapania palmula | – | – | – | 7 | Least concern |
 Orange-peel DorisAcanthodoris lutea | – | Up to 3 cm | – | 7 | Least concern |
 Blue TenelliaTenellia bughaw | – | – | – | 7 | Least concern |
 Blood-red PlatydorisPlatydoris sanguinea | – | – | – | 7 | Least concern |
 Atkinsons' CeratodorisCeratodoris atkinsonorum | – | – | – | 7 | Least concern |
 Decorated ChromodorisGoniobranchus decorus | – | Up to 2 cm | – | 7 | Least concern |
 Los Angeles GoniodoridBermudella angelensis | – | – | – | 7 | Least concern |
 Murca MourgonaMourgona murca | – | Up to 11 mm | – | 7 | Least concern |
 Melky's ThecaceraThecacera melkyi | – | – | – | 7 | Least concern |
 Allen's MiamiraMiamira alleni | – | – | – | 7 | Least concern |
 Pacific CorambeCorambe pacifica | – | Up to 15 mm | – | 7 | Least concern |
 Romer's VerconiaVerconia romeri | – | – | – | 7 | Least concern |
 Eyespot AglajaAglaja ocelligera | – | Up to 2 cm | – | 7 | Least concern |
 Hedgpeth's SapsuckerElysia hedgpethi | – | Up to 2.5 cm | – | 7 | Least concern |
 Bertsch's NudibranchHypselodoris bertschi | – | – | – | 6 | Least concern |
 Green Candy RoundheadTenellia speciosa | – | – | – | 6 | Least concern |
 Fragile DiscodorisSebadoris fragilis | – | Up to 10 cm | – | 6 | Least concern |
 Harlequin FlameJanolus savinkini | – | – | – | 6 | Least concern |
 Confetti HypselodorisHypselodoris confetti | – | – | – | 6 | Least concern |
 Southern BaeolidiaBaeolidia australis | – | Up to 3.5 cm | – | 6 | Least concern |
 Mimic DoridBaptodoris mimetica | – | Up to 4.5 cm | – | 6 | Least concern |
 Lion Mane AeolidPauleo jubatus | – | Up to 4.6 cm | – | 6 | Least concern |
 Orange-edged Pump DoridTrapania vitta | – | – | – | 6 | Least concern |
 Paper-bubblePhiline aperta | – | – | – | 6 | Least concern |
 Wide-margined Rainbow DoridThorunna halourga | – | – | – | 6 | Least concern |
 Porcupine SakuraeolisSakuraeolis nungunoides | – | – | – | 6 | Least concern |
 Lion Tentacle AeolidCratena simba | – | – | – | 6 | Least concern |
 Chan's DoridHallaxa chani | – | Up to 3 cm | – | 6 | Least concern |
 Sickle SpinophallusSpinophallus falciphallus | – | – | – | 6 | Least concern |
 Sinai NudibranchPhyllidiopsis sinaiensis | – | – | – | 5 | Least concern |
 Cuban ChelidonuraChelidonura cubana | – | Up to 9 mm | – | 5 | Least concern |
 Modest CadlinaCadlina modesta | – | Up to 3.3 cm | – | 5 | Least concern |
 Filigreed Lightbulb DoridPlocamopherus ceylonicus | – | – | – | 5 | Least concern |
 Bas's CyerceCyerce basi | – | – | – | 5 | Least concern |
 Guam OdontoglajaOdontoglaja guamensis | – | Up to 10 mm | – | 5 | Least concern |
 Mimic AsteronotusAsteronotus mimeticus | – | – | – | 5 | Least concern |
 Coral-loving MelibeMelibe coralophilia | – | – | – | 4 | Least concern |
 Maori ElysiaElysia maoria | – | Up to 2.5 cm | – | 4 | Least concern |
 Smoky Sucking DoridDendrodoris fumata | – | – | – | 4 | Least concern |
 Kuiters' TenelliaTenellia kuiterorum | – | – | – | 4 | Least concern |
 Egg-eating NudibranchFavorinus japonicus | – | – | – | 4 | Least concern |
 Lemon PleurobranchBerthellina citrina | – | Up to 3 cm | – | 4 | Least concern |
 Dark-spot CadlinaCadlina sparsa | – | Up to 3.6 cm | – | 4 | Least concern |
 Scott Johnson's NudibranchArdeadoris scottjohnsoni | – | – | – | 4 | Least concern |
 Sulphur DiversidorisDiversidoris sulphurea | – | – | – | 4 | Least concern |
 Purple Spotted NudibranchChromodoris aspersa | – | Up to 4 cm | – | 4 | Least concern |
 Nightsky Tentacle AeolidAmanda armata | – | – | – | 4 | Least concern |
 Twinspot Rainbow DoridMexichromis pusilla | – | – | – | 4 | Least concern |
 Indian NudibranchAnteaeolidiella cacaotica | – | – | – | 4 | Least concern |
 Purple-ringed BluntnoseSamla riwo | – | – | – | 4 | Least concern |
 Beaded Anemone EaterLimenandra confusa | – | – | – | 4 | Least concern |
 Maiden EubranchopsisEubranchopsis virginalis | – | – | – | 4 | Least concern |
 Snow Queen LacedragonTritoniopsis elegans | – | Up to 5.5 cm | – | 4 | Least concern |
 Red-headed AeolidNoumeaella rubrofasciata | – | Up to 8 mm | – | 4 | Least concern |
 Sea BunnyJorunna parva | – | – | – | 3 | Least concern |
 Lotus CoryphellinaCoryphellina lotos | – | – | – | 3 | Least concern |
 Burnt-edged Pump DoridPelagella longicornis | – | – | – | 3 | Least concern |
 Lemon-drop Longtail DoridDiversidoris flava | – | – | – | 3 | Least concern |
 British Columbia DotoDoto columbiana | – | Up to 12 mm | – | 3 | Least concern |
 Warty Soft Coral EaterPhyllodesmium tuberculatum | – | – | – | 3 | Least concern |
 Iriomote PhyllodesmiumPhyllodesmium iriomotense | – | – | – | 3 | Least concern |
 Corded DermatobranchusDermatobranchus funiculus | – | – | – | 3 | Least concern |
 Longhorn Pump DoridGoniodoridella savignyi | – | – | – | 2 | Least concern |
 Pacific AnculaAncula pacifica | – | – | – | 2 | Least concern |
 Kikutaro Baba's CyerceCyerce kikutarobabai | – | – | – | 2 | Least concern |
 Bolland's HypselodorisHypselodoris bollandi | – | – | – | 2 | Least concern |
 Cardinal PhyllidiopsisPhyllidiopsis cardinalis | – | Up to 6 cm | – | 2 | Least concern |
 Encrusting JanolusJanolus incrustans | – | – | – | 2 | Least concern |
 Violet-gill NudibranchHypselodoris violabranchia | – | – | – | 2 | Least concern |
 Wormy NudibranchLomanotus vermiformis | – | Up to 2.1 cm | – | 2 | Least concern |
 Polka-dot Sucking DoridDendrodoris guttata | – | – | – | 2 | Least concern |
 Black And Gold Sap Sucking SlugCyerce nigricans | – | Up to 2 cm | – | 2 | Least concern |
 Todd's TrapaniaTrapania toddi | – | – | – | 2 | Least concern |
 Blue DoriopsisDoriopsis pecten | – | Up to 2 cm | – | 2 | Least concern |
 Red-gilled TrapaniaTrapania miltabrancha | – | – | – | 2 | Least concern |
 Pink TritonidTritonia exsulans | – | Up to 4.4 cm | – | 1 | Least concern |
 Eyebrow Sap-suckerCostasiella fridae | – | – | – | 1 | Least concern |
 White-speckled Sponge DoridRostanga lutescens | – | – | – | 1 | Least concern |
 Dashing SiphopteronSiphopteron makisig | – | – | – | 1 | Least concern |
 Kamagong TrapaniaTrapania kamagong | – | – | – | 1 | Least concern |
 Feather AeolidFiona pinnata | – | Up to 2.5 cm | – | 1 | Least concern |
 Rowena's DoriopsillaDoriopsilla rowena | – | – | – | 1 | Least concern |
 Southern Rainbow DoridThorunna australis | – | – | – | 1 | Least concern |
 Scribbled Tentacle AeolidFacelina bourailli | – | – | – | 1 | Least concern |
 Delicate CoryphellinaCoryphellina delicata | – | – | – | 1 | Least concern |
 White-stripe Rainbow DoridVerconia norba | – | – | – | 1 | Least concern |
 Parangatum PhyllodesmiumPhyllodesmium parangatum | – | – | – | 1 | Least concern |
 Mija BermudellaBermudella mija | – | – | – | 1 | Least concern |
 Tamaraw TrapaniaTrapania tamaraw | – | – | – | 1 | Least concern |
 Batik Sea SlugTubulophilinopsis reticulata | – | – | – | 1 | Least concern |
 Yellow-ringed JanolusJanolus flavoanulatus | – | – | – | 1 | Least concern |
 Tora TrapaniaTrapania tora | – | – | – | 1 | Least concern |
 Jester Trapania NudibranchTrapania scurra | – | – | – | 1 | Least concern |
 Holey Split-tooth DoridHypselodoris lacuna | – | – | – | 1 | Least concern |
 Coral Feeding AeolidPhestilla lugubris | – | Up to 5 cm | – | 1 | Least concern |