Glossodoris at Fly Point

January 7, 1998
From: David & Leanne Atkinson

We found these at Fly Point, Port Stephens, New South Wales over Christmas. The first is a nudi that looks like a Glossodoris atromarginata but has a red frill where the other has black. Gills and rhinophores are black in both cases. Is this a colour variation?
David & Leanne Atkinson.

Atkinson, D. & L., 1998 (Jan 7) Glossodoris at Fly Point. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

This is Glossodoris angasi which does indeed look like Glossodoris atromarginata and has been mistaken for it since 1864 when George Angas published his account on nudibranchs from Sydney Harbour. I named this species after Angas. The internal anatomy of these species is quite different but externally their colour is very similar. Glossodoris angasi has a much softer body than G. atromarginata, the edge of the mantle is less folded, and the colour band ranges from reddish brown to a light pink. In G. atromarginata the colour border is black...Bill Rudman

Rudman, W.B., 1998 (Jan 7). Comment on Glossodoris at Fly Point by David & Leanne Atkinson. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from


Glossodoris angasi

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