Coriocella nigra Blainville, 1824
broad tubercles. The
cephalic tentacles are speckled with white. All known Hawaiian animals
show this coloration although the species appears to be more variable
elsewhere in the Pacific.
is a rare species known from two animals found in moderately protected
to moderately exposed rocky habitats at a depth of 1-4 m (3-13 ft).
However, it may be more common in Halimeda
kanaloana beds at French Frigate shoals. It produces layered, oval fecal
pellets. (Note 1)
Maui and French Frigate Shoals: widely distributed in the Indo-Pacific.
at French Frigate Shoals during cruises prior to 2006. Due to
the more limited color range found in Hawaii, there's
some chance that the Hawaiian population might be distinct.
Kapalua Bay, Maui; May 22, 2008.
Observations and comments:
1: The granular layers in the fecal pellets (see photo) appear to be composed of compacted spicules from didemnid tunicates suggesting that the species feeds on that group in Hawaii.