Chromodoris annae, C. dianae & C. willani on one sponge

November 18, 2009
From: Mirjam Broos



Hello Bill,

Just thought it would be nice to share these pictures of Chromodoris willani [upper], C. annae [middle] and C. dianae [lower] together on one sponge.

Locality: Mabul, Seaventure, Sabah, Malaysia, 24 september 2009. Photographer: Geert Prast.

Greetings,
Mirjam

mirjam.broos@planet.nl

Broos, M., 2009 (Nov 18) Chromodoris annae, C. dianae & C. willani on one sponge. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/22807

Dear Mirjam,

This is a very valuable photo as it is another example of similarly coloured species aggregating together on the same sponge which they are almost certainly feeding on. It is a thorectid sponge of the genus Petrosaspongia.

Interestingly, many of the black-lined chromodorids in the Pacific feed on this group of sponges, and the chromodorids are quite often found in multispecies groupings like this. As they all store distasteful chemicals from their prey sponges in their mantles, I suspect that fish have learned to avoid black-lined slugs - a case of safety in numbers.

Best wishes,
Bill Rudman

Rudman, W.B., 2009 (Nov 18). Comment on Chromodoris annae, C. dianae & C. willani on one sponge by Mirjam Broos. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/22807

Factsheet

Chromodoris annae

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