Re: Glossodoris cf. atromarginata from Guam

June 29, 2002
From: Clay Carlson

Bill,
Concerning our earlier message on this animal without a black border which we think is a variety of G. atromarginata. Here are some other Guam examples. Photo 1a doesn't show much except it is the whole animal for Photo 1b. This is an example of the faint marginal line. It actually extends further on the animal but the scanning process wiped some of it out.

• Photo 1a: 24mm; Guam, Pago Bay, 24m; 31 July 1987. Showing indistinct line along mantle edge]. Photo 1b: Enlargment of head area of Photo 1a.
• Photo 2: Glossodoris atromarginata (Cuvier, 1804); 29mm; Guam, Bile Bay, 6m; 23 May 1971. Typical G.atromarginata with black mantle border.
• Photo 3a: size?; Guam, Tanguisson, 8m; 5 March 1971. No black margin except for trace around posterior edge (see Photo 3b).

Clay

clay.carlson@kuentos.guam.net

Carlson, C., 2002 (Jun 29) Re: Glossodoris cf. atromarginata from Guam. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/7387

Note added 5 Feb 2007: This is most probably Glossodoris tibboeli [see message #19385]

Thanks Clay,
I have hunted through all my records and have never seen a specimen of G. atromarginata which even looks like it is losing its black margin. That is not to say it doesn't occur in Guam. It would certainly be worth looking at least at the radula to see if there was some obvious difference in shape or size from 'typical' G. atromarginata. I have added an enlargement (3b) which seems to show a black edge to the posterior part of the mantle. It may represent the upper edge of dark pigmentation on the sides of the body but from above certainly looks like a black edge.
Cheers,
Bill Rudman

Rudman, W.B., 2002 (Jun 29). Comment on Re: Glossodoris cf. atromarginata from Guam by Clay Carlson. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/7387

Factsheet

Glossodoris tibboeli

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