March 14, 2005
From: Binyamin Koretz
Last month, I sent you a couple of poor photos of what looked like a small Elysiid sp. [message #13166], which as yet you haven't posted. We have encountered this slug several more times in the same vicinity, and now we have some halfway decent photos.
Locality: Eilat, Tables South, Israel. Red Sea (Gulf of Eilat). Depth: 28 m. Length: ca 1.5 cm. 04 March 2005. sea grass. Photographer: Binyamin and Shulamit Koretz
email@example.comKoretz, B., 2005 (Mar 14) Rediscovery of Elysia trilobata from Red Sea. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/13299
Sorry I hadn't posted your earlier message but the photos didn't give me any clues to its identity so it was waiting in the 'difficult' basket. However as soon as I saw these photos it reminded me of a species described from Sudan on the basis of one small specimen - Elysia trilobata Heller & Thompson, 1983, and after re-reading their description I am sure that is what your animal is. This is the first record of it since that description in 1983 and so is a very valuable contribution to our knowledge.
I must admit I thought this species must have been based on a damaged, perhaps half-eaten animal, the shape of the [parapodia appearing very strange in Heller & Thompson's drawing. I can see from your photos that their drawing was quite accurate - but the shape is still very strange. In fact in the upper right animal it almost looks as though there is a gap on the right side, between the anterior and middle lobe of the parapodia, making it look as though it has been bitten. I have posted your earlier message as well, as the photos in that message show animals that are not fully extended. In that condition the 'trilobate' shape is not so clear.
Heller, J. & Thompson, T. E. (1983) Opisthobranch molluscs of the Sudanese Red Sea. Zoological Journal of the Linnean Society, 78: 317-348.