Unlined Flabellina rubrolineata?
February 14, 2006
From: Nicholas Missenden
![](/images/m15762a.jpg)
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![](/images/m15762d.jpg)
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
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