Samoan Glossodoris atromarginata?

August 29, 2000
From: Don Barclay

Hi Bill,

Larry Madrigal and I went diving on the north side of Tutuila, American Samoa today and found a few nudibranchs we hadn't found here before. One slug we found was Chelidonura pallida, which may be a range extension to the east. Another that we found is attached, probably Glossodoris atromarginata, but it doesn't look exactly like any of the photos I've seen. It does seem closer to that species than any other, though. It was about 20mm long when crawling.

This one was collected about one kilometer east of Fagamalo village, northwest Tutuila Island, in 10 to 15 meters of water under rocks on sponge, 3 pm local time, 27 August 2000.

Thanks a lot,
Don

n5ols@samoatelco.com

Barclay, D., 2000 (Aug 29) Samoan Glossodoris atromarginata?. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/2939

Dear Don,
I think this is Glossodoris atromarginata, but there are a number of similarly coloured species which cannot be confidently identified just on photographs. Your animal though, looks quite like a colour form of G. atromarginata which I found in Tanzania. Although this is from the other side of the Indo-West Pacific, I suspect it may represent a coastal colour form, much like the brown-mottled Dendrodoris nigra you collected at the same place.

If you find animals on potential food, like the sponge you mention here, a photo of the sponge is always useful. I realise of course that that is nor always possible. I would also love to see a photo of your Chelidonura pallida.

Other similarly coloured species of Glossodoris include Glossodoris angasi which seems to be restricted to south eastern Australia, and Glossodoris paladentatus which has much much smaller white tubercles and some brownish mottling, but can only be definitively identified by the shape of its most distinctive radular teeth.

Best wishes,
Bill Rudman.

Rudman, W.B., 2000 (Aug 29). Comment on Samoan Glossodoris atromarginata? by Don Barclay. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/2939

Factsheet

Glossodoris atromarginata

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