(Alder & Hancock, 1844)
North Atlantic, European coast from France to Iceland, North American coast from Newfoundland to New England.
UPPER: 73 feet (34 meters) off New York, USA. PHOTO: Betsy Hansen.
LOWER: Burghsluis, Oosterschelde, The Netherlands, 10 April 1999. PHOTO: Peter van Bragt.
Grows to about 15mm long. Reported to feed on hydroids Eudendrium ramosum but in deeper water it is found eating Halecium articulosum and Clytia johnstoni.
Comparison from Terry Gosliner message below: 'The main external characteristics for differentiating F. gracilis from F. verrucosa is that the cerata are more distinctly arranged in rows in F. gracilis and there is a more prominent vestige of a notal brim in F. gracilis. Also F. gracilis has a sort of notched head between the junction of the oral tentacles and more elongate anterior margins of the foot'.
• Kuzirian, A.M. (1979) Taxonomy and biology of four New England coryphellid nudibranchs. Journal of Molluscan Studies, 45: 239-261.
• Thompson, T.E. & Brown, G.H. (1984) Biology of Opisthobranch Molluscs, Vol 2. Ray Society: London.
Rudman, W.B., 1999 (August 28) Flabellina gracilis (Alder & Hancock, 1844). [In] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/factsheet/flabgrac
Flabellina gracilis from Maine, USA
From: Alan Shepard, August 28, 2003
Flabellina gracilis from Scotland
From: Jim Anderson, May 27, 2002
Flabellina gracilis & F. browni
From: Bernard Picton , July 22, 2001
Flabellina gracilis from the Netherlands
From: Peter H. van Bragt, September 4, 1999
From: Erwin Koehler, August 31, 1999
Re: Flabellina gracilis? from New York
From: Terry Gosliner , August 29, 1999
Flabellina gracilis? from NY
From: Betsey Hansen, August 27, 1999