Actinocyclus papillatus is a species of sea slug or dorid nudibranch, a marine gastropod mollusk in the family Actinocyclidae.Valdés, A. (2002) Review of the genus Actinocyclus Ehrenberg, 1831 (Opisthobranchia: Doridoidea). The Veliger 45: 193-202. Accessed through: Sea Slug Forum at http://www.seaslugforum.net/find/actipapi on 2012-02-26
Distribution Actinocyclus papillatus is found in the tropical Western Indo-Pacific Ocean.
Description This nudibranch grows up to 100 mm in length.
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