Staphylaea staphylaea
A rare, easily-missed find in Queensland and Kwajalein Atoll reefs, this small cowrie hides in warm 24-30C water year-round.
A small, glossy shell with a rounded, almost grape-like shape and a purplish-brown to violet tone, often with fine ridges or tubercles running across the back. Look for the narrow ventral slit lined with teeth typical of cowries, and the way the mantle can extend to cover the shell when undisturbed. It sits low and tucked into reef structure, so divers usually find it by scanning crevices closely rather than spotting it from a distance.
Divers encounter it wedged into reef crevices and under coral rubble, usually motionless and easy to swim past. It doesn't react to divers in any obvious way, being a slow-moving grazer that relies on staying hidden rather than fleeing. Most sightings come from divers deliberately checking nooks and undercuts on the reef rather than mid-water encounters.
Like other cowries, it can retract its shell almost entirely under a fleshy mantle when at rest, which is part of why it's so easy to overlook even when it's sitting in plain sight.
No clear seasonal pattern shows up in the sightings, and with a comfortable range of roughly 23.5 to 29.6C, warm tropical reef conditions hold year-round in these regions, so there's no particular month to target.
Most consistently logged in Queensland, Australia and Kwajalein Atoll in the Marshall Islands, with a single logged sighting on Reunion's Saint-Paul coast. Across all these sites it's tallied as rare, so finding one usually takes deliberate crevice-searching rather than a lucky glance.
Mapping where Grape Cowrie is logged…
It turns up most reliably in Queensland, Australia and around Kwajalein Atoll in the Marshall Islands, with an occasional sighting off Reunion's Saint-Paul coast.
There's no detected season for this one. It's found in warm water between roughly 23.5 and 29.6C year-round, so any time you're diving those reefs is fair game.
Look for a small, glossy, rounded shell in purplish-brown tones with fine ridging across the back, tucked into a reef crevice. The narrow, toothed slit on the underside is a classic cowrie giveaway once you flip your light on it.
Exact size data isn't available, but like most small cowries in this family, it stays modest, typically a couple of centimetres, easy to miss against reef texture.
Yes, it's logged as rare at the vast majority of sites where divers have found it, with only a handful of sites rating it uncommon. Spotting one usually takes patient searching of crevices rather than a casual look.
Site and sighting data is aggregated from diver logs, iNaturalist and GBIF. For taxonomy and conservation status:
Elysia Timida
573 sites
