Re: Hypselodoris bullocki? again

November 27, 2008
From: Marcel Tanke

Concerning message #1747:

Dear Bill,

In the above message, you doubt whether the very blue colour is real. Or caused by the photograpy. The picture attached of a similar specimen we found in Puerto Galera, indeed shows a more pinkish and lighter blue color; thus supporting your point of view.

Locality: Puerto Galera, 15 m, Philippines, 11 February 2008, Sandy bottom. Length: 5 cm. Photographer: Marcel Tanke.

Best regards,
Marcel

marceltanke@cs.com

Tanke, M.A., 2008 (Nov 27) Re: Hypselodoris bullocki? again. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/21737

Thanks Marcel,
It looks like the colour in this colour form or species varies from a very dark blue to the lighter colour in your photos. The broad white band around the mantle edge is reminiscent of Hypselodoris apolegma [see #19710] but in H. apolegma the white border does not have the distinct inner edge that your animals have. But as I have discussed before, is H. apolegma really a distinct species?

Because of this difference to the mantle border, I have kept specimens such as yours [see #2073, #1747, #2274, #18974, #16653] as part of the H. bullocki group. One other point is that the gill colour of these blue ones differs from orange, as in your animals, to deep blue [#20665]. What it all means, I have no idea. Some years ago I tried without success to find anatomical differences between different colour forms, and as you will see on the Forum ,we have at least two examples of different colour forms, or species, mating [see #6816, #20968]. Mating only with ones own kind is a basic tenet of the species concept. If the different colour 'forms' are different species, then H. apolegma is surely a particularly incompetent species.

Best wishes,
Bill Rudman

Rudman, W.B., 2008 (Nov 27). Comment on Re: Hypselodoris bullocki? again by Marcel Tanke. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/21737

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