How to distinguish the blue Felimare

Felimare tricolor by Enric Madrenas

Any diver with a certain experience searching for opisthobranchs in the Mediterranean or Eastern Atlantic could tell you that, sometimes, it is pretty difficult to tell apart which species of blue Felimare nudibranch you are looking at. The new genus Felimare recently replaced the classic denomination Hypselodoris that is found in most printed books. Felimare opisthobranchs of the Mediterranean and Atlantic Ocean were revised by Ortea et al in 1996. Still…

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