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Ceratosoma tenue  Abraham, 1876

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Pretty similar are Ceratosoma trilobatum which has 3 lateral lobes, and Ceratosoma gracillimum which has 3 lateral lobes and no mantle edge between the head and the lobes. Ceratosoma tenue has 5 lobes on each side of the body. There is an anterior lobe on either side of the head, a large lobe on each side by the gills, and one large lobe behind the gills.
More informations on Ceratosoma tenue are at Bill Rudman's Sea-Slug Forum!