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Ceratosoma trilobatum which has 3 lobes, and
Ceratosoma gracillimum which has 3 lobes and no mantle edge between the head and the lateral lobes.
More information on Ceratosoma tenue are on Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2017), published 17 February 2017, Ceratosoma tenue Abraham, 1876
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Doridina/Ceratosoma_tenue.htm