Radula of Onchidoris depressa

October 15, 2003
From: Bill Rudman

To accompany my message about Onchidoris depressa from Tasmania, here is a scanning electron micrograph of the radula of a specimen from there. The radula looks identical to Thompson & Brown's (1984) illustration of the radula of Onchidoris depressa. In this species the large inner tooth has a large quadrangular base and a small denticulate hook on the outer corner. As usual in the genus, there is one small outer lateral tooth. In this photo there appears in some rows to be two small lateral teeth, but in fact the inner one of these 'teeth' is the broken outer edge of the large inner tooth. It has broken during the preparation of the teeth for the scanning electron microscope.

PHOTO: near Lauderdale, Hobart, Tasmania, Australia. 16 February 1984. AM C141255. Photo: Geoff Avern.

Best wishes,
Bill Rudman

Rudman, W.B., 2003 (Oct 15) Radula of Onchidoris depressa. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/8641

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