Clusters of Glossodoris atromarginata

January 9, 2002
From: Ákos Lumnitzer


Hi Bill,
The first thing I found on our Shark Point dive [north side of Clovelly Bay, Sydney, Australia] yesterday [5 January 2002] was seven Glossodoris atromarginata huddled together. here is a digital still from George Evatt's video (upper right). I've also included a shot I got about four years ago at Bare Island, La Perouse [Sydney] of four specimens congregating.

kind regards
Ákos

dna72@softhome.net

Lumnitzer, A., 2002 (Jan 9) Clusters of Glossodoris atromarginata. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/5912

Dear Ákos,
Thanks for the photos. I suspect that under the weedy growth they seem to be on, is a colony of their food sponge. It likely that their clustering is not so much an act of socialising but a coming together for food. Of course once they are together other things, like mating, may occur. Perhaps next time you see a group like this you could check out whether there is a hidden sponge beneath the weed. If you gently pull a couple of the slugs out of the cluster you may see their mouth parts still extended which would be a good indication of feeding.
Best wishes,
Bill Rudman

Rudman, W.B., 2002 (Jan 9). Comment on Clusters of Glossodoris atromarginata by Ákos Lumnitzer. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/5912

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Glossodoris atromarginata

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