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Dermatobranchus cf. oculus  Gosliner & Fahey, 2011

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cf. is an abbreviation from a Latin word (confer) and means 'refer to' or 'compare with', here it means it could possibly be Dermatobranchus oculus or perhaps something closely related, or at least similar in appearance.
Dermatobranchus oculus has recently been described, (published in February 2011) in:
Gosliner, Terrence M. & Fahey, Shireen J., 2011, Previously undocumented diversity and abundance of cryptic species: a phylogenetic analysis of Indo-Pacific Arminidae Rafinesque, 1814 (Mollusca: Nudibranchia) with descriptions of 20 new species of Dermatobranchus.
Zoological Journal of the Linnean Society. 2011 February; 161(2): 245–356.
This text is completely online at http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3073124/
Dermatobranchus oculus is characterized by brown spots each with an unpigmented halo around it (eye-spots).
The specific name oculus is from the Latin word meaning ‘eye’ or ‘bud’ referring to the evenly spaced oscillated spots on the dorsum.
Let me quote Gosliner & Fahey, 2011:
"The ground colour of the dorsum and foot is opaque white. The depressions between the dorsal ridges are light grey. There are dark centred ocellated spots on the dorsum surrounded by pink pigment. The rhinophore stalk is white and the club is black. The oral veil is opaque white with a light grey border."
There is a picture of it from Okinawa, Japan at the Okinawa Slug Site.
Dermatobranchus cf. oculus differs by the completely white oral veil, it lacks the light grey border.
How to cite:
Köhler, E. (2016), published 23 March 2016, Dermatobranchus cf. oculus  Gosliner & Fahey, 2011
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Dexiarchia/Dermatobranchus_oculus_cf.htm