September 4, 2000
From: Mary Jane Adams
Here are some Chromodoris daphne I found on a silty sand slope near Alotau, Papua New Guinea.
Depth: 5 meters
Crawling length of larger one: 22 mm
The spots on the smaller slug are numerous tiny pinpoints. There some opaque white spots near the edge of the mantle that I am guessing are poison glands. There are three bands of color on the mantle edge; yellow, maroon and a thin discontinuous bluish purple which is more prominent around the head.
One of my other shots of these slugs shows the gills partially retracted. I just discovered that C. daphne is supposed to be endemic to NSW, so I guess that presents a problem.
Thanks so much for keeping up the Forum.
Adams, M.J., 2000 (Sep 4) Chromodoris daphne? from Papua New Guinea. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/2953
Dear Mary Jane,
This is an interesting find. I think it is Chromodoris preciosa. Chromodoris daphne seems to be restricted to south-eastern Australia, although Marshall & Willan (1999) record it from the southernmost end of the Great Barrier Reef. It does not have a white or clear band at the sdge of the mantle and no white edging to the gills or rhinophores. In your photos there is some trace of a whitish mantle border outside the red, and white edging to the gills and rhinophores. I have not seen distinct red spots, as in your photo, in Chromodoris preciosa but the mottled animal certainly is characteristic of that species.
It also has similarities to Chromodoris trimarginata but in that species the gills and rhinophores are white or colourless. Alternatively we have to begin thinking that some of these species are just colour forms of each other, but as I commented recently about Glossodoris cincta, sometimes, when internal anatomy doesn't help with clearcut differences, it is difficult to decide where one species ends and another begins.
Photos like yours, although they complicate the picture, are extremely welcome because what we really want is the actual picture, not the easy answer.
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