Lauriea siagiani
Look for a fuzzy pink and purple crustacean tucked inside barrel sponges across the Visayas and Bali, year-round in warm reef water.
Small enough to miss, this squat lobster has a body covered in fine hair-like bristles that give it a fuzzy, almost fungal look. Colouring runs from lilac to pink with purple-tinged legs and a mottled pattern that blends into the sponge tissue it lives on. It sits curled against the inner wall of a barrel sponge, claws tucked, rather than crawling openly on the reef.
Divers find it wedged inside the folds of a barrel sponge, usually motionless or making small sideways shuffles as it grazes on the sponge's surface tissue and mucus. It rarely bolts when a light passes over it, which makes it a favourite for macro photographers willing to hover and wait for a clean angle between the sponge folds. Expect a slow, patient search rather than a swim-by encounter, since it is logged as uncommon even at sites where it turns up.
Those hair-like bristles are thought to help it disappear against the rough, papillose surface of its host sponge, turning a fairly bright animal into effective camouflage.
No clear seasonal pattern shows up in the sightings, and with a comfortable range of roughly 25 to 31 C this is a year-round find on tropical reefs. Success comes down to finding the right barrel sponge on the day, not timing a season.
Reef neighbours a diver could mistake it for. Use the identification notes above to tell them apart.
Most logged in the Philippines, especially the Visayas and Luzon, with a strong secondary population in Indonesia around Bali and Nusa Tenggara. These are muck and reef sites with healthy barrel sponge growth, which is really the deciding factor over any particular country or region.
Mapping where Hairy Squat Lobster is logged…
The Philippines is the strongest bet, particularly the Visayas and Luzon, with Bali and Nusa Tenggara in Indonesia also reliable. Look for dive sites known for barrel sponges rather than any specific reef type.
There is no strong season in the sightings, and warm water in the 25 to 31 C range keeps it comfortable year-round. Any month works as long as you find a barrel sponge to search.
Look inside barrel sponges for a small, fuzzy-bodied crustacean in shades of pink and purple. The fine bristles covering its body and its habit of staying tucked against the sponge wall are the main giveaways.
They stay small, easily overlooked against the sponge tissue they live in. Exact size data is limited, but divers should expect a centimetre-scale animal best appreciated with a macro lens.
Its hairy, textured body surface mimics the rough look of the barrel sponge it lives on, giving it camouflage that keeps it hidden even when divers are looking directly at the sponge.
Site and sighting data is aggregated from diver logs, iNaturalist and GBIF. For taxonomy and conservation status:
Caribbean Spiny Lobster
2,209 sites
