Chromodoris magnifica feeding?

January 17, 2007
From: Paul Osmond

Hi Bill,

Found this Chromodoris magnifica on a coral reef head on the Aphol Dive site in Anilao, The Philippines in August of 2006. I was wondering whether the yellow sponge pictured is the food source for this species or just something it is just sitting on.

Locality: Aphol Dive Site, 15m, Anilao, The Philippines, 13 August 2006, patch coral reef. Length: 30mm. Photographer: Paul T Osmond.

I also have included an older image where the same species is on a grey sponge (and near a pink sponge) which is similar to another image I saw on the forum from Charles Rowe [#16851 ].

Enjoy,
Paul
Deep Sea Images

marriard@deepseaimages.com

Osmond, P.T., 2007 (Jan 17) Chromodoris magnifica feeding?. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/19222

Dear Paul,

Thanks for the photos. They well illustrate the problems - and pitfalls - of trying to build up information on feeding in these animals. The yellow sponge could be either a darwinellid,which most species of Chromodoris feed on, or a dysideid, which a few species feed on. But there is no evidence in the photos to say your animal is doing anymore than juts passing by.

Your other photo, certainly has remarkable similarities to Charles Rowe's photo. In both, there is a pink patch and a grey patch. The pink, in both photos is not a sponge but an encrusting coralline algae. However the grey patch in both photos could well be a thorectid sponge, Petrosaspongia, which is the food of a number of species of Chromodoris. Interestingly, in your upper photo it may not be the yellow sponge we should be looking at but the grey-white one, which may also be Petrosaspongia. However this is all just speculation withour some direct evidence of feeding. It would certainly be worth filing it away in a 'to do' section of your brain as something worth looking out for next time you come across this spectacular animal.

At present the only records we have of feeding in this species are a few on the Forum of it feeding on species of Negombata [ #5941, #14107, #15164].

Best wishes,
Bill Rudman

Rudman, W.B., 2007 (Jan 17). Comment on Chromodoris magnifica feeding? by Paul Osmond. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/19222

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