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Ceratosoma gracillimum  Semper in Bergh, 1876

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Ceratosoma gracillimum is characterized by the complete absence of the mantle edge between the head and the well-developed lateral lobes.
This specimen has an abnormal extension of the right lateral lobe.
Pretty similar are:
Ceratosoma trilobatum which also has 3 lobes, but a mantle edge between the head and the lobes and
Ceratosoma tenue which has 5 mantle lobes.
More informations on Ceratosoma gracillimum are at Bill Rudman's Sea-Slug Forum!