Psolidium bidiscum, a new shallow water, psolid sea cucumber (Echinodermata: Holothuroidea) from the northeastern Pacific, previously misidentified as Psolidium bullatum Ohshima

This paper was originally published by the Canadian Journal of Zoology. Issue 74: 20-31 (1996).

Abstract

A common west coast psolid sea cucumber, formerly identified as Psolidium bullatum Ohshima, 1915 is described as a new species. Psolidium bidiscum new species has two types of ventral ossicles, one type of dorsal cup, and 10 scales between the mouth and anus. Psolidium bullatum Ohshima, 1915 has one type of ventral ossicle, no dorsal cups and 19 scales between the mouth and anus. P. bidiscum is known from southeastern Alaska and south to Monterey, California between 0 and 200 m in depth. P. bidiscum is compared with six other species of Psolidium from the eastern Pacific.

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