Unlined Flabellina rubrolineata?

February 14, 2006
From: Nicholas Missenden

Hello Bill,
I was wondering if you could confirm the identity of this nudibranch for me please. Is it a Flabellina rubrolineata? There were a number of these on the one bryozoan. This is the same bryozoan, Pleurotoichus clathratus that I normally find the Okenia hallucigenia on so at first I thought that it was another form of Okenia. After some research and looking at the numerous colour variations for the Flabellina rubrolineata shown on your site I think that it may well be one. I realise that they feed on hydroids and that it is possibly just a coincidence that its on the same bryozoan food source for the Okenia.

Locality: Bare Island, West Reef, Botany Bay, Sydney, NSW, Australia. Depth: 17 m. Length: 10 mm. 05 February 2006. Broken reef, sandy bottom
Photographer: Nicholas Missenden

Kindest regards
Nick

njmpm@iinet.net.au

Missenden, N.J., 2006 (Feb 14) Unlined Flabellina rubrolineata?. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/15762

Dear Nick,
Yes this is the unlined form of Flabellina rubrolineata. If I hadn't found lined and unlined animals together I would have had my doubts but anatomically they are the same. The bryozoan Pleurotoichus often has other colonial animals growing over it including hydroids of various kinds. I have added a close-up of your photo showing some hydroid polyps, which could be the reason the Flabellina is on the bryozoan.
Best wishes,
Bill Rudman

Rudman, W.B., 2006 (Feb 14). Comment on Unlined Flabellina rubrolineata? by Nicholas Missenden. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/15762

Factsheet

Flabellina rubrolineata

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