From the western Mediterranean around the northern Atlantic coast to the White Sea, Greenland & Iceland and across the New England coast of N. America. If A. pacifica is the same species it also occurs on the west coast of North America.
UPPER RIGHT: Mumbles, Swansea, Wales, United Kingdom, March 1993. Specimens found at low tide (0.1m) on larger stones in lowest Fucus serratus belt. PHOTO: Daniel Geiger.
LOWER RIGHT: White-spotted colour form, Vancouver, British Columbia, Canada. PHOTO: C. Gibbs.
Grows to about 30mm. Translucent white, usually with three longitudinal orange lines on body and orange tipped rhinophores, gills and papillae. Rarely, as in this photo, the orange is replaced with opaque white. Usually found on compound bryozoans but Picton, on his website, suggests they may in fact feed on Entoprocta [= Kamptozoa], minute animals thast can be found living on bryozoans and other sessile animals. Ancula pacifica from west coast of North America is identical in colour and Thompson (1976) considers it a synonym of A. gibbosa.
See my comments below.
See message on white-spotted colour form.
See message on Ancula pacifica.
• Risso, A. (1818). Memoire sur quelques gasteropodes nouveaux, nudibranches et tectibranches observes dans la mer de Nice (1). Journal de Physique de Chimie, d'Histoire naturelle et des Arts, Paris 87: 368-377.
Rudman, W.B., 2000 (March 24) Ancula gibbosa (Risso, 1818). [In] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/factsheet/ancugibb
Ancula gibbosa from California
From: Clinton Bauder, May 31, 2007
Re: Ancula from NE Pacific
From: Jan Kocian, June 3, 2006
Re: more Ancula from NE Pacific
From: Jan Kocian, June 1, 2006
Ancula from NE Pacific
From: William Hevener, May 29, 2006
Spotted Ancula from eastern Russia
From: Alexei Chernyshev, January 13, 2006
Ancula pacifica from South Korea
From: Dong Bum Koh, July 16, 2005
Spotted Ancula from NE Pacific
From: Sandra Millen, July 11, 2005
Ancula pacifica from Vancouver, Canada
From: Paul Sim, June 13, 2005
Re: Supplement to Pacific Coast Nudibranchs
From: Joao Pedro T. L. S. Silva, July 23, 2004
Ancula gibbosa from Massachusetts, USA
From: Alan Shepard, January 13, 2003
Ancula gibbosa from New England
From: Alan Shepard, March 20, 2002
Colour variation in Ancula gibbosa
From: Bernard Picton , March 6, 2001
Re: Ancula pacifica feeding photos
From: Jeff Goddard, June 29, 2000
Ancula pacifica feeding
From: Bruce Wight, June 28, 2000
Ancula pacifica mating
From: Bruce Wight, June 20, 2000
Ancula pacifica in Oregon and Washington
From: Jeff Goddard, June 12, 2000
A photo of 'typical' Ancula pacifica
From: Dave Behrens, June 11, 2000
Photos from British Columbia
From: Marli Wakeling, June 3, 2000
Ancula gibbosa white-spotted version
From: Marli Wakeling, May 28, 2000
Ancula gibbosa colour variety
From: Sandra Millen, May 19, 2000
Differences between species of Ancula
From: Sylvain LE BRIS , March 26, 2000