July 16, 2002
From: Terry Gosliner
I am sending several images of Cuthona pinnifera from Midway Island in the Hawaiian Islands. I think the animals that you posted before are something different. They appear to have angular foot corners. Certainly the color is different, as well.
• Gosliner, T.M. (1979) The systematics of the Aeolidiacea (Nudibranchia: Mollusca) of the Hawaiian Islands, with descriptions of two new species. Pacific Science, 33(1): 37-77.
I agree that Cuthona cf. pinnifera is not C. pinnifera. Shigeru's message with 'typical' animals from Japan, and your animals from Midway remove any doubts I might have had. I agree that the anterior foot corners of Cuthona cf. pinnifera are probably tentacular which would suggest it may be a glaucid of some sort. These semicircular plates on the rhinophores, while peculiar, are not unique to C. pinnifera.