Pteraeolidia ianthina from Sipadan trip

July 21, 2006
From: Charles Rowe

Hi Bill,
This is the fourth of a series of nudis from my trip to Sipadan which I would like you to identify and comment on. This nudi was tiny and we had problems focussing on it but I think I did quite a good job.

Locality: Sipadan Island, 15metres, Malaysia, 29 April 2006, reef. Length: 8 mm. Photographer: Charles Rowe.

Charles Rowe

bumff@mweb.co.za

Rowe, C., 2006 (Jul 21) Pteraeolidia ianthina from Sipadan trip. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/16850

Dear Charles,
This is a solar-powered nudibranch, Pteraeolidia ianthina. You may be more familiar with it in its dark brown colour phase, but the white phase is an indication that its 'battery is flat'. If you look at the solar-powered Fact Sheet you will see that these nudibranchs store live single-celled plants [zooxanthellae] in their bodies - which gives them their brown colour - but we are not sure where they get the plants from in the first place. All juveniles are white like this, and they stay white until they start to grow zooxanthellae in their bodies.

Best wishes,
Bill Rudman

Rudman, W.B., 2006 (Jul 21). Comment on Pteraeolidia ianthina from Sipadan trip by Charles Rowe. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/16850

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Pteraeolidia ianthina

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