Chromodoris geometrica - Phyllidiid mimic
October 7, 2005
From: Paul Osmond
Bill,
I found this group of I believe phyllidiid nudibranchs on a night dive on Flinders Reef off the coast of Townsville in Queensland, Australia. I haven't been able to figure an exact species (or even if I am looking in the right direction) so any help is appreciated.
There was roughly 10 individuals in a small area, all about an inch in size. We were roughly in 15m of water.
Thanks,
Paul
www.deepseaimages.com
marriard@deepseaimages.com
Osmond, P., 2005 (Oct 7) Chromodoris geometrica - Phyllidiid mimic. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/11597Dear Paul,
This is Chromodoris geometrica. No great shame in thinking it is a phyllidiid. It is one of the classic phyllidiid mimics - but the circlet of gills tends to sabotage its mimicry.
You would think that a cluster of animals together like this would mean it would be easy to find what its favourite sponge food was. These photos are cropped versions of 6 or 7 of yours which I searched diligently for signs of an identifiable sponge, but they show no more than the ones I am posting - which is nothing! All I can say is that they have eaten the sponge out, or else it is partially overgrown by other growths. I am not desperate to know what sponge it feeds on as I have records of it on the purple sponge Chelonaplysilla violacea, but it well illustrates how difficult it is to build up feeding information on these animals.
Best wishes
Bill Rudman
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