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Here is a picture of a specimen fom Flores, Indonesia.
Similar specimens which differ by a magenta edging to the head shied and the parapodia were misidentified by Bill Rudman and posted on 15 April 2003 on these wesites as Atys naucum (Linnaeus, 1758), I changed them on 20 March 2016 into Atys sp. 03 Genus: Montfort, 1810.
All species of the genus Atys are herbivorous, related to Haminoea and Phanerophthalmus. At present most species are tropical and have heavy well-calcified shells. In most cases the true foot is short and the shell extends a considerable distance beyond its posterior end. It is possible when more of the many tropical species are studied that they will be placed in other genera.
More information on Atys naucum are on Bill Rudman's Sea Slug Forum!
How to cite:
Köhler, E. (2016), published 20 March 2016, Atys naucum (Linnaeus, 1758)
available from https://www.Philippine-Sea-Slugs.com/Cephalaspidea/Atys_naucum.htm