June 28, 2000
From: Bruce Wight
Hi again Doc.
Regarding the question as to what Ancula pacifica eats, I see them feeding on hydroids. Attached are photos of Ancula pacifica and juvenile Flabellina trilineata eating at the same table on a smorgasbord of some type of hydroid.
Hope you enjoy the images,
email@example.comWight, B., 2000 (Jun 28) Ancula pacifica feeding. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/2629
I don't know why I didn't check the wonderful List of the Worldwide Food Habits of Nudibranchs by Gary McDonald & James Nybakken at http://www2.ucsc.edu/people/mcduck/nudifood.htm when I asked you about their food.
In it, they list the food of Ancula pacifica to be Barentsia ramosa (Robertson), which is a member of the Phylum Entoprocta, which superficially look quite like hydroids. I suspect the animal in your photo, which I have arrowed, are entoprocts rather than hydroids. The Entoprocta are a small group of animals which used to be considered part of the Bryozoa [which are also known as Ectoprocta].
If I am right, I am not sure whether that means that your juvenile Flabellina trilineata are feeding uncharacteristically on entoprocts, or whether there are also small hydroids around as well.
It is also interesting to note in McDonald & Nybakken's list that Ancula gibbosa from Europe [as A. cristata] is reported to feed on hydroids and compound ascidians, although, as I note at the top of the page, Bernard Picton thinks it may feed on some animal that lives on compound ascidians.
If there is a good distinction between A. gibbosa and A. pacifica in feeding behaviour, then that it is useful evidence to suggest they are different species.
Perhaps someone from your part of the world will recognise the 'hydroid' or 'entoproct' in your photo.
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 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