Risbecia ghardaqana from Andaman Sea

April 8, 2003
From: Mary Jane Adams


Hi Bill,
I photographed this nudibranch at Three Islets, Mergui Archipelago, Andaman Sea, Myanmar on Feb. 14, 2003. It was crawling around the reef at 5 meters. The notum was 15 mm long. At first I filed it with my Risbecia pulchella slides. However, after looking at images on the Sea Slug Forum, I think it looks more like Risbecia ghardaqana. What do you think?
Best regards,
Mary Jane

divepng@yahoo.com

Adams, M.J., 2003 (Apr 8) Risbecia ghardaqana from Andaman Sea. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/9481

Note added 12 October 2007: From number of gills I am pretty sure this is R. pulchella rather than R. ghardaqana.

Dear Mary Jane,
I think you might be right. In a separate message I am posting today I discuss the differenes between these two species. Your animal agrees in not having a the front of the mantle widened into a 'veil' and not having any diffuse purple marks on the mantle. It differs in having reddish-purple markings rather than deep blue. I think it is early days in separating these two species so I'll consider it to be Risbecia ghardaqana until the evidence says otherwise
Best wishes,
Bill Rudman

Rudman, W.B., 2003 (Apr 8). Comment on Risbecia ghardaqana from Andaman Sea by Mary Jane Adams. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/9481

Factsheet

Risbecia pulchella

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