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Ceratosoma trilobatum (Gray, J.E., 1827) [Doris]

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Ceratosoma trilobatum is characterized by 3 lobes as the name tells (tri = 3; lobatum = lobes): one on each side just anterior to the gills and one long recurved dorsal 'horn' behind the gills. There is usually a ridge joining each lateral lobe to the anterior head lobe. It is highly variable in the background colour.
Pretty similar are:
Ceratosoma tenue which can have very similar colour patterns but has 4 lateral lobes an one lobe behind the gills lobes (5 lobes) and
Ceratosoma gracillimum which also has 3 lobes but no mantle edge between the head and the lateral lobes.
More informations on Ceratosoma trilobatum are at Bill Rudman's Sea-Slug Forum!