March 6, 2001
From: Bernard Picton
I see there is some debate over Ancula gibbosa and A. pacifica, and whether A. gibbosa occurs on the Pacific coast of North America. I enclose pictures of:
UPPER PHOTO: typical A. gibbosa with yellow markings (Millisle, Co. Down, Nthn Ireland) and
LOWER PHOTO: aberrant white form (Kilroot, Belfast Lough) without these markings. The
latter is already represented by Daniel Geiger's picture from Swansea.
I see also that you say Bernard Picton says Ancula feeds on minute animals living on bryozoans - actually I used the name kamptozoans which is a synonym of Entoprocta - so I agree with your conclusions about the food of
Ancula pacifica. I prefer to use Kamptozoa as I get confused between Entoprocta and Ectoprocta - Both used to be in the Phylum Polyzoa (Bryozoa) so Ectoprocta now = Bryozoa - confused yet?
In my earlier messages I have shown that species of Trapania also feed on Entoprocts (Kamptozoans).
email@example.comPicton, B., 2001 (Mar 6) Colour variation in Ancula gibbosa. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/3910
Firstly on feeding. I should have been more precise, 'minute animals' is not very informative. Considering that you have shown that Trapania also eats them [Entoprocta, Kamptozoa], they are definitely important enough to be named so I have changed the reference at the top of the page.
The more photos I see of Atlantic animals the more I wonder if Ancula pacifica is really the same species. The anatomy and radula seem quite similar, but these characters may not be useful in distinguishing species in this genus.
Are Thompson & Brown (1984) the only ones who have considered these species to be synonymous? They say: "Specimens found along the Californian coast, described under the name Ancula pacifica MacFarland, 1905, have extra pigment patches on the dorsum, but apparently lack other morphological differences"
If this is the only argument in favour of synonymising them, it doesn't seem very convincing to me. I would be grateful for anyone else's views or information.
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
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