Radula of Okenia nakamotoensis

December 21, 2004
From: Bill Rudman

In Gosliner's recent review of Okenia, Hopkinsia nakamotoensis Hamatani, 2001 was one of the species which he considered was more appropriately placed in Okenia. One major difference from most members of that genus is the shape of the radular teeth which I have posted here thanks to the permission of Terry Gosliner.

The radular formula of this animal is 16 x  1.1.0.1.1. The inner lateral teeth are extremely thin and elongate and have recurved hook-like tip. They also lack denticles. The outer laterals are small and reduced with a forward pointed cusp.

PHOTO: Scanning electron micrograph showing long slender inner lateral
teeth, scale = 150 µm. (CASIZ 096238). Photo: T.M.Gosliner.

Gosliner, T. M. (2004) Phylogenetic Systematics of Okenia, Sakishimaia, Hopkinsiella and Hopkinsia (Nudibranchia: Goniodorididae) with descriptions of new species from the tropical Indo-Pacific. Proceedings of the California Academy of Sciences, 55: 125-161.

Bill Rudman

Rudman, W.B., 2004 (Dec 21) Radula of Okenia nakamotoensis. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/12637

Factsheet

Okenia nakamotoensis

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