Chromodoris willani - feeding (2)

April 8, 2006
From: Guido & Philippe Poppe

Dear Bill

Here are some photos of Chromodoris willani you may find interesting from our website on Philippines marine life at
http://www.poppe-images.com/.

Photos: One sponge colony and close-ups of different parts of it. Hilutungan Is, off Mactan Is, Cebu. Philippines.14 m. Night. 2005. Photos: Copyright Guido & Philippe Poppe.

Best wishes,
Guido & Philippe Poppe

philippe@conchology.be

Poppe, G. & Poppe, P., 2006 (Apr 8) Chromodoris willani - feeding (2). [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/16270

Dear Guido & Philippe,
I have included close-ups of three parts of the sponge colony shown in your upper photo to show how the external structure of sponges can vary considerably. [see messages #16257, #16271 for further photos of C. willani feeding].

This photo illustrates another point concerning building up information on nudibranchs feeding on sponges. Once you are sure that you have a feeding observation you have to be abe to identify the sponge. While a few species are instantly recognisable, many sponges can only be identified by studying tbeir microscopic structure. External structure can often be misleading, as many sponges grow quite different shapes in different environments. This colony of Semitaspongia is an excellent example, because it has three quite distinct growth forms in one colony: a honeycomb pattern of radiating ridges, a pattern of exposed raised bundles of fibres, and a smooth area with large oscules. In the other two messages I have include examples of sponge colonies of the same species which have only one of these growth forms.

Best wishes,
Bill Rudman

Rudman, W.B., 2006 (Apr 8). Comment on Chromodoris willani - feeding (2) by Guido & Philippe Poppe. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/16270

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