Hypselodoris infucata color variation from the Red Sea

February 13, 2006
From: Binyamin Koretz

Dear Bill,

Hypselodoris infucata is a commonly seen nudibranch here in Eilat with a large, stable population, most typically colored as in the photos posted earlier by Oren Lederman (msg #13791) and Ilan Ben-Tov (msg #9491 ). We've regularly seen an annual cycle, generally speaking, beginning with the appearance of juveniles in the early winter through mature mating adults in the spring and possibly into summer.

Locality: Eilat, Malibu Beach, 2m, Israel, Red Sea (Gulf of Eilat), 04 February 2006 (night), coral rubble. Length: ca 1.5 cm. Photographer: Binyamin and Shulamit Koretz

The attached photo (probably sub-adult) shows an unsual color variation that I've never seen before at any development stage. You can see that the lower two-thirds of the rhinophore lamellae are pale rather than the usual red-orange. In parallel, the gill edges are also colored only in the uppermost area.

Best regards
Binyamin

binyamin@koretz.net

Koretz, B., 2006 (Feb 13) Hypselodoris infucata color variation from the Red Sea. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/15795

Dear Binyamin,
This is indeed a strange colour variation, but if you compare it with Ilan Ben-Tov's photos the biggest difference is the absence of the background blue colour. However the wat the gills and rhinophores only have orange at the tips is very strange as rhinophore colour is one part of the colour pattern we can usually rely on to be constant. I guess you should add this to your list of things to keep an eye on.
Best wishes,
Bill Rudman

Rudman, W.B., 2006 (Feb 13). Comment on Hypselodoris infucata color variation from the Red Sea by Binyamin Koretz. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/15795

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Hypselodoris infucata

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