Thorunna horologia
Rudman, 1984

Order: NUDIBRANCHIA
Suborder: DORIDINA
Family: Chromodorididae

DISTRIBUTION

At present known from Tanzania and northeastern South Africa.

PHOTO

Dar es Salaam, Tanzania, 8, 12mm long alive, November, 1976. PHOTO: Bill Rudman.

This white species is characterised by a red outer line and a yellow-orange inner line at the mantle edge. about midway down the mantle on each side there is a thicker reddish purple patch which gives the body a "waist". The 'hour-glass' appearance of the mantle gave me the idea of horologia (= clock) for its species name.

References:
•Rudman, W.B. (1984) The Chromodorididae (Opisthobranchia: Mollusca) of the Indo-West Pacific: a review of the genera. Zoological Journal of the Linnean Society 81: 115-273.
•Rudman, W.B. (1985) The Chromodorididae (Opisthobranchia: Mollusca) of the Indo-West Pacific: Chromodoris aureomarginata, C. verrieri and C. fidelis colour groups. Zoological Journal of the Linnean Society, 83: 241-299.
•Gosliner, T. (1987) Nudibranchs of Southern Africa. A guide to opisthobranch molluscs of Southern Africa. California: Sea Challengers & Jeff Hamann.

Authorship details
Rudman, W.B., 1998 (November 11) Thorunna horologia Rudman, 1984. [In] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/factsheet/thorhoro

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