Hypselodoris obscura from Wallis Lake

December 1, 2003
From: Peter Barnes

Dear Dr Rudman,
I came across this nudibranch in Wallis Lake on the mid north coast of New South Wales [Australia]. The few individuals I found were all on sponges (Mycale sp.) in relatively shallow water (less 2m) amongst a dense bed of Charophytes (Lamprothamnion sp.). This photograph was taken in January 2002. The salinity of Wallis Lake is usually close to that of seawater. I was wondering whether you might be able to identify it for me.
Thanks.
Peter Barnes

pbb47@uow.edu.au

Barnes, P,, 2003 (Dec 1) Hypselodoris obscura from Wallis Lake. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/11548

Dear Peter,
This is Hypselodoris obscura, a species endemic to south-eastern Australia. I am interested in your observation about it always being on a particular sponge. I would be surprised if the sponge was a species of Mycale, as chromodorid nudibranchs feed on sponges which lack siliceous spicules. If you have any photos of the nudibranch on the sponge I would be interested in seeing them as we are short of information on the specific feeding habits of most species of opisthobranch and your observation would be a useful bit of information.
Best wishes
Bill Rudman

Rudman, W.B., 2003 (Dec 1). Comment on Hypselodoris obscura from Wallis Lake by Peter Barnes. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/11548

Factsheet

Hypselodoris obscura

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