Previously known only from western Mediterranean. Reported here from Turkey.
Istanbul, Turkey. Divesite: Yassiada, 30 September 2001.
UPPER: Depth: 28m, Size: approx. 5cm.
LOWER: Depth: 26m, Two animals approx. 5cm, 3cm long. [Lower left - Close-up to show two tubercle types on mantle]. PHOTOS: Baki Yokes.
There are few records of this endemic Mediterranean species. It is characterised externally by the pale translucent white or yellowish mantle with diffuse brown spots and it has four gills. The mantle is covered by two types of tubercles: most are short and rounded, and a few that can extend into long tapering papillae.
• Cattaneo-Vietta, R. R. Chemello, R. Giannuzzi_Savelli, R. (1990) Atlas of Mediterranean Nudibranchs.
• Schmekel, L. & Portmann, A. (1982) Opisthobranchia des Mittelmeeres. Springer-Verlag: Berlin. 410pp.
Rudman, W.B., 2001 (October 15) Thordisa filix Pruvot-Fol, 1951. [In] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/factsheet/thorfili