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This species is pretty variable in its background colour, some specimens have large dark grey patches. Many variants are shown on nudipixel.
More information on Dermatobranchus gonatophorus are on Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2018), published 2 February 2018, Dermatobranchus gonatophorus van Hasselt, 1824
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Cladobranchia/Dermatobranchus_gonatophorus.htm