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Aegires citrinus (Bergh, 1875) [Notodoris]

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Aegires citrinus is characterized by the complete yellow mantle, which is in line with the species name: modern Latin citrinus = lemon-colored.
The white specimen is posibly a juvenile, almost adult, albino form - juveniles can have black rhinophores, read on this Richard Willan's comment at the Sea Slug Forum but it might be as well a juvenile of an Aegires sp. -
at the Sea Slug Forum are several pictures of a white species from South Africa as Notodoris sp. 2
It was originally placed in the genus Notodoris. I'm following the recent paper: Fahey S.J. & T.M. Gosliner. 2004. A Phylogenetic Analysis of the Aegiridae Fischer, 1883 (Mollusca, Nudibranchia, Phanerobranchia) with Descriptions of Eight New Species and a Reassessment of Phanerobranch Relationships. Proceedings of the California Academy of Sciences 55 (34): 613-689, 82 figs., 4 tables. and place the genus Notodoris into Aegires.
More informations on Aegires citrinus are at Bill Rudman's Sea-Slug Forum!