Gastropteron bicornutum from Sydney

January 16, 2004
From: Bill Rudman

To accompany my record of Gastropteron bicornutum from New Caledonia, here is a reocrd of an animal from the temperate waters of Sydney, Australia.

• Long Reef, Collaroy, Sydney, New South Wales, Australia. 20 January 1992. Coolected from algal washings, low tide. AM C172761

The body is translucent with clear and dark regions. In the clear regions there are small yellow & opaline green spots (yellow predominate) and scattered larger dark brown diffuse spots. In dark regions the dark brown spots all tend to coalesce. In the translucent regions are larger yellow spots and some greeny blue patches.

Down the midline of the visceral hump there are 4 rounded but raised tubercles, 2 of which have white tips. There is a very distinctive large floppy papilla off the edge of the mantle flap. I presume this is the upper of the two papillae normally found in this species. As with the animal from New Caledonia, this specimen had only one of the two posterior papillae considered characteristic of this species
Best wishes
Bill Rudman

Rudman, W.B., 2004 (Jan 16) Gastropteron bicornutum from Sydney. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

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