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This species is most likely Polycera sp. 3 in IPN at page 103,
Polycera sp. 2 at Jun Imamoto's website umiushi - Sea Slugs from Japan and
Polycera sp. #1 at Sea Slugs of Hawaii. Reference:
Gosliner, Terrence M., David W. Behrens & Ángel Valdés. 2008. Indo-Pacific Nudibranchs and Sea Slugs.
Sea Challengers Natural History Books. Gig Harbor, Washington. 426pp.,
How to cite:
Köhler, E. (2018), published 9 April 2018, Polycera sp. 04 Genus: Cuvier, 1816
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Doridina/Polycera_sp_04.htm