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Very similar is Okenia kondoi. They can be distinguished by the number of dorsal appendages: Okenia kondoi has four pairs, Okenia nakamotoensis has five pairs.
It was described by Hamatani as Hopkinsia nakamotoensis, Gosliner (2004) proposed synonymising the genera Hopkinsia, Sakishimaia, and Hopkinsiella with Okenia.
Gosliner, T. M. (2004) Phylogenetic Systematics of Okenia, Sakishimaia, Hopkinsiella and Hopkinsia (Nudibranchia: Goniodorididae) with descriptions of new species from the tropical Indo-Pacific.
Proceedings of the California Academy of Sciences, 55: 125-161
More information on Okenia nakamotoensis are on Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2017), published 11 February 2017, Okenia nakamotoensis (Hamatani, 2001)
available from https//www.Philippine-Sea-Slugs.com/Nudibranchia/Euctenidiacea/Okenia_nakamotoensis.htm