Is Favorinus the only egg eater?

October 18, 2000
From: Phanor Montoya

Dear Bill:

I have a question: If I found a very small aeolid nudibranch in an opisthobranch egg mass could I assume that it might be a species of the genus Favorinus?

I found two aeolid nudibranchs in a different opisthobranch's egg mass, but I couldn't take their picture. After I saw them they were the same species and they seem to belong to the genus Favorinus.

Best wishes,

Montoya, P., 2000 (Oct 18) Is Favorinus the only egg eater?. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Phanor,
I think you can be fairly safe in assuming that an aeolid that eats opisthobranch eggs is most probably a member of the genus Favorinus. However the only way to be sure is to have a look at their anatomy, and in particular the single row of radular teeth.
Best wishes,
Bill Rudman.

Rudman, W.B., 2000 (Oct 18). Comment on Is Favorinus the only egg eater? by Phanor Montoya. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from



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