Sea slug - Volvatella vigourouxi

A lucky find were these Volvatella vigourouxi, an animal in a group related to nudibranchs. Although hermaphrodites, the little ones are most likely young males that haven't yet developed female organs. This species is known for allowing smaller males to cling to an adult. The large one was around 1/2 inch (13mm).

18 May 2015

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