Re: Is this also Chromodoris quadricolor?

November 5, 2005
From: Binyamin Koretz

Dear Bill,
Along with Chromodoris kuiteri, I would also cast doubt on Chromodoris hamiltoni being in the Red Sea, or at least at this end of it. Ilan's animal [message #9457] seems to me to be what we are calling Chromodoris strigata and not Chromodoris hamiltoni. In his photo that you suggested might be C. hamiltoni, you can clearly see the characteristic dark translucent spots on the mantle, which generally run to bluish in the Red Sea.

Jacob's question [message #15098] further highlighted one of our constant slug issues in Eilat: distingushing between Chromodoris africana and Chromodoris quadricolor. The former is relatively rare and possibly seasonal (spring) while the former is common year-round. Based on your answer, I would guess that the majority of "africana" sightings here are really C. quadricolor, something that I suspected anyway.

Best regards
Binyamin

binyamin@koretz.net

Koretz, B., 2005 (Nov 5) Re: Is this also Chromodoris quadricolor?. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/15123

Dear Binyamin,
I suspect now that all the animals in Ilan's message are C. quadricolor. The basic difference in colour between C. quadricolor and C. africana is that C. quadricolor, as its name describes, has 4 'colours' - blue, white orange, black - while C. africana does not have blue. Unfortunately in photographing these animals the blue can be lost so trying to identify animals solely from photos can be very difficult. In living animals, apart from the colour, the shape of the bodies is quite different with C. quadricolor being relatively narrow with a straight sided, and fairly narrow, mantle skirt. C. africana, on the other hand has a broad oval shaped mantle with a wide mantle skirt. I must admit that at times I cannot resolve the indentity of some of these species from the photos. Unfortunately, the lack of blue in a photo does not necessarily mean the animal lacked blue.
Best wishes,
Bill Rudman

Rudman, W.B., 2005 (Nov 5). Comment on Re: Is this also Chromodoris quadricolor? by Binyamin Koretz. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/15123

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