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Pretty similar is Thecacera sp. 01 which has black spots on the body and black tipped extrabranchial processes.
More information on Thecacera pacifica are on Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2017), published 3 August 2017, Thecacera pacifica (Bergh, 1883)
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Euctenidiacea/Thecacera_pacifica.htm