Re: Chromodoris collingwoodi feeding

June 24, 2000
From: Jeff Goddard

Hi Bill,

Great photos by Mary Jane Adams of Chromodoris collingwoodi feeding on the black sponge, and I could not agree more with your comments about the value of these kinds of photos and locality information. Kudos to you for providing us all with such a fine venue for presenting information on our favorite creatures.

Regarding Mary Jane's bottom right photo. Are those spongin fibers protruding from the surface of the sponge? Is it possible to tell from your file of the image if that black sponge is an Aplysillid?

Best wishes,
Jeff

goddard@lifesci.ucsb.edu

Goddard, J., 2000 (Jun 24) Re: Chromodoris collingwoodi feeding. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/2606

Dear Jeff,
There do appear to be spongin fibres protruding from the sponge body in Mary Jane's photo. I suspect it is an aplysillid but it's not one I have run past Pat Bergquist who kindly helps me with sponge identifications. Aplysillids and other sponges without spicules are particularly difficult to identify because the spicules provide a particularly useful set of characters. Unless aplysillids are well preserved, and sufficient samples are available, and colour photos are available they are impossible to identify. Sounds much like identifying a nudibranch doesn't it?

It is possible that the photo at the top of the page is a growth or colour form of the same sponge. I also have photos of C. collingwoodi on a dark blue sponge of similar shape. The UPPER photo is from Carol Buchanan and was taken in her aquarium od a specimens from the Solitary Ids, northern new South Wales, Australia, January, 1986. The LOWER photo is an unlabelled photo from the museum collection which I have kept because of the sponge connection.

Some species of chromodorid seem to be always found on their food sponges while others, like C. collingwoodi, need us to patiently accumulate information over a number of years.

Best wishes,
Bill Rudman.

Rudman, W.B., 2000 (Jun 24). Comment on Re: Chromodoris collingwoodi feeding by Jeff Goddard. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/2606

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