Phanerophthalmus albocollaris  Heller & Thompson, 1983

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Phanerophthalmus albocollaris is characterized by a purplish body, distinctive is the opaque white "W" or "M" at the posterior end of the ead shield. Some specimens from Japan have another small patch of minute opaque white spots at the posterior end, the specimens #4 and #5 almost lacks the white spot, I'd better label them Phanerophthalmus cf. albocollaris  Heller & Thompson, 1983, as it is on the Sea Slugs of Hawaii.
The genus Phanerophthalmus has a remarkable resemblance to members of the family Aglajidae, and until quite recently was considered to be a member of that family. It is an herbivorous opisthobranch, closely related to the genus Haminoea, with a similar radula and gizzard plates.
More information on Phanerophthalmus albocollaris are on Bill Rudman's Sea Slug Forum!
How to cite:
Köhler, E. (2016), published 24 June 2016, Phanerophthalmus albocollaris  Heller & Thompson, 1983
available from http://www.Philippine-Sea-Slugs.com/Cephalaspidea/Phanerophthalmus_albocollaris.htm