Gastropteron bicornutum from Koumac

January 16, 2004
From: Bill Rudman

Here is a record of Gastropteron bicornutum from Koumac in northern New Caledonia.

• Chenal de la Passe de Koumac, N of Ilot Kendac, 20°38.8'S, 164°15.6'E, New Caledonia. 32-37m, 8 Oct. 1993. 6mm live length 1 specimen, AM C200414

The animal was translucent with scattered spots of yellow, brown and white. It agrees with G. bicornutum in colour and radular morphology [see separate message], but lacks the second papilla on posterior visceral hump which gives this species it name. I can only assume that the papillae has either been lost through damage or is absent trhough some developmental mistake. This is the first record of the species from New Caledonia and with other recent records on the Forum suggests it has a wide distribution at least in the tropical and subtropical western Pacific
Best wishes
Bill Rudman

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

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