Thordisa filix? from Turkey

October 17, 2001
From: Baki Yokes

Dear Bill,
Recently I encountered a nudibranch species which I had never seen before. They are so flat that it is nearly impossible to take a clear picture of them, since they are almost embedded to the surface they are found on. The gills seem to indicate a Thordisa species. What is your opinion?

They were photographed at Istanbul, Turkey Divesite: Yassiada], 30 September 2001.
UPPER PHOTO: Showing extended gills - Depth: 28m, approx. 5cm long.
LOWER PHOTOS: A pair 3, 5cm long: Lower Left photo showing maginified view of mantle showing nature of papillae. Depth: 26m
Photos by Baki Yokes.

Best wishes

Yokes, B., 2001 (Oct 17) Thordisa filix? from Turkey. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Baki,
I think this is Thordisa filix Pruvot-Fol, 1951. I am not familiar with the species but your animal looks like Thordisa and the ilustrations of Thordisa filix in Mediterranean books appear to be the same. As far as I know it has been rarely found, and only in the western Mediterranean, so if my identification is correct, yours is a new record for the northeastern Mediterranean.

Best wishes,
Bill Rudman

Rudman, W.B., 2001 (Oct 17). Comment on Thordisa filix? from Turkey by Baki Yokes. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from


Thordisa filix

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