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It is a species of colorful sea slug, a dorid nudibranch, a marine gastropod mollusk in the family Polyceridae.It is a large black nembrothid that grows to at least 50 mm in length. Its body is covered with green pustules. The rhinophores and gills are black, edged in green.
The red dots in the surrounding coral are copepods that parasitize the coral.
Spotted on Sep 30, 2012
Submitted on Oct 29, 2012