Favorinus mirabilis? from Japan.

January 9, 2004
From: Jun Imamoto


Dear Bill,
Here is another sea slug which I have not seen before. It was eating the eggs of Aplysia. I am happy if these reports are useful for your research.

4 January 2004
Amami Ooshima Islands, Kagoshima, Japan.
Size: approx 6mm
depth: 1 m
temperature: 22 C

Best Regards,
Jun Imamoto

imamoto@umiushi.info

Imamoto, J., 2004 (Jan 9) Favorinus mirabilis? from Japan.. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/11813

[Note added 29 April 2005: see message #13443 suggesting upper photo is F. pacificus and lower F. japonicus]

Dear Jun,
From the conspicuous purplish spot near the tip of each ceras I would say this animal is Favorinus mirabilis but the shape of the rhinophores is a bit of a puzzle. In Favorinus mirabilis the rhinophore clubs are lamellate, while in your animal they are smooth except for a subterminal swelling which is obvious in the photo of the animal crawling on the rock. At 6mm, this is clearly a juvenile so perhaps it has not yet developed lamellae. It would be good if you could find some slightly larger animals so we could see if lamellae develop on the rhinophores at a later stage in their development
Best wishes
Bill Rudman

Rudman, W.B., 2004 (Jan 9). Comment on Favorinus mirabilis? from Japan. by Jun Imamoto. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/11813

Factsheet

Favorinus pacificus

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