Onchidoris depressa from New Caledonia

October 15, 2003
From: Bill Rudman

Colin Redfern's photos of the Corambe-like onchidorid? from the Caribbean, reminded me of these occurrences of what, I am pretty sure, is Onchidoris depressa, far away from its north Atlantic home.

These photos are from Noumea in tropical New Caledonia and show an animal, which in all external aspects matches O. depressa. It has the soft tapering papillae, the red-brown spots on the mantle, and the closely packed spicules ate clearly visible. I found it at two different sites, and one population were laying eggs which match thise of North Atlantic animals, and also the eggs of animals I have found in the cooler waters of southern Tasmania, Australia, which I describe in a separate message.

• North point of Île Nou, Nouméa, 11 October 1988, intertidal, on bryozoan with many egg masses, AM C156621.
• Îlot Freycinet, Nouméa, 1m, 23 October 1988, on bryozoan, AM C156672.

Bill Rudman

Rudman, W.B., 2003 (Oct 15) Onchidoris depressa from New Caledonia. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/8643

PHOTOS: All photos are of the Île Nou animals. The centre photo shows animal and egg ribbon on bryozoan colony. Lower photo shows animal on bryozoan. Photos: Bill Rudman

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