On the basis of a single specimen from the island of Mauritius, de Blainville described Coriocella nigra as a new species. Quoy and Gaimard made no distinction between this species and Chelyonotus tonganus, from the island of Tonga in the South Pacific. With the help of the museums of natural sciences of Paris and Berlin and observations of seven living specimens of C. nigra and four living specimens of Chel. tonganus, a redescription of these two lamellarids is given.
Coriocella nigra de Blainoille
Chelyonotus tonganus Quoy & Gaimard