Re: Mating Thuridilla hopei from Croatia
July 30, 2002
From: Andreas Ahrens
Hello Bill,
Concerning your comment. Unfortunately I know nothing about embryological development of Thuridilla hopei. But I checked all my photos of Thuridilla hopei. The front of the foot is seldom visible but it always has this red colour, not only when mating.
The red colour that so many sea animals show always was a bit mysterious to me. Since the sunlight is filtered selectively by the water in a depth of five meters there is not red any more. So, anything that "is red" appears black. At least as long as there is no curious diver with an artficial light source.
Ciao,
Andreas
Andreas.Ahrens@hamburg.de
Ahrens, A., 2002 (Jul 30) Re: Mating Thuridilla hopei from Croatia. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/7654Thanks Andreas,
I wasn't expecting an answer from you. My question was more in the way of 'thinking aloud'. You are right to bring up the question of colour. It's not only a question of how we see different colours at different depths but how other animals, such as fish, 'see' colours. A very fascinating area for research.
Best wishes,
Bill Rudman
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