Re: Chromodoris magnifica vs. C. annae

August 1, 2002
From: Erwin Koehler

Dear Bill,
Re your comment - Like many other uw-photographers am I working with a digital camera. There is no possibility of influence on a film ... I always use 1/250 sec. and the smallest diaphragm, correcting the exposures with the power of my flashgun. Bernard Picton sent to you some similar looking shots at March 13, 2002 - which you IDed also as possible Chromodoris annae.
Cheers,
Erwin

Erwin@medslugs

Koehler, E., 2002 (Aug 1) Re: Chromodoris magnifica vs. C. annae. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/7680

Dear Erwin,
I was going to mention variation in digital cameras as well but didn't want to overemphasise the point that whatever system we use to record an animal's colour, there is no such thing as a perfect or 'absolute' method. I recently, as a test, photographed a colouful shell with two digital cameras and two flatbed scanners. All produced rather different results - and one of the scanners produced the most accurate results, although I admit that using a flatbed scanner for nudibranchs, either above or in the water, wouldn't be very practical!

I am quite happy to accept your photo is an accurate colour record of the animal you saw, as it is quite clear that many of these species do show colour variability. That is why I suggested it is usually more important to look at the total colour pattern and combination of colours rather than think that a light orange gill means one species, and a reddish gill means a different species. Interestingly Chromodoris magnifica shows a similar variation in the gill and rhinophore colour, some being almost red, other light orange. In this case, I think the spotted pattern on the blue is pretty convincing evidence that your animal is a colour form of C. annae.
Cheers,
Bill Rudman

Rudman, W.B., 2002 (Aug 1). Comment on Re: Chromodoris magnifica vs. C. annae by Erwin Koehler. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/7680

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