Coriocella nigra is common in the Marshalls on lagoon pinnacles and the seaward reef. Large adults are usually exposed on the reef, while juveniles tend to hide under rocks. They lay their wispy black egg masses on or around an exposed jet black sponge that may also be a food source. Large specimens are almost blue-black.
Eggs deposited on black sponge.
Juveniles are often lighter in color.
We assume this is a small juvenile of Coriocella nigra, but it has not been confirmed.
This is the thin internal shell.
Created 1 October 2009
Updated 8 August 2019
