Chromodoris orientalis
Rudman, 1983

Order: NUDIBRANCHIA
Suborder: DORIDINA
Family: Chromodorididae

DISTRIBUTION

Originally reported from Japan, it is now known from Hong Kong (Orr 1981; Rudman 1983).

PHOTO

Shelter Is. (SE), Port Shelter, 10 m., Hong Kong. [Site 10.10]. 4 June 1983, AM C140157. PHOTO: Brian Darvell.

The white background, large black spots and orange-yellow border to the mantle clearly distinguish this species. The foot is similarly coloured with a few scattered black spots and a row of orange spots along the edge. The rhinophore clubs and the edges of the gills are orange. In Japanese material, at least, the inner edge of the gills can be lined with black rather than orange or yellow. It grows to at least 30 mm. It is similar in colour to Hypselodoris placida but one distinctive difference is the absence of a submarginal band of blue patches in C. orientalis.

This species is one of a group of species in which the egg ribbon is attached flat on the substrate rather than just along one edge (Baba et al, 1956).

References:
• Baba, K., Hamatani, I. & Hisai, K. (1956) Observations on the spawning habits of some of the Japanese Opisthobranchia. 2. Publications of the Seto Marine Biological Laboratory, 5(2): 209-220.
• Rudman, W.B. (1983a) The Chromodorididae (Opisthobranchia: Mollusca) of the Indo-West Pacific: Chromodoris splendida, C. aspersa and Hypselodoris placida colour groups. Zoological Journal of the Linnean Society, 78: 105-173.
• Rudman, W.B. & Darvell, B.W. (1990) Opisthobranch molluscs of Hong Kong. Part 1. Goniodorididae, Onchidorididae, Triophidae, Gymnodorididae, Chromodorididae, (Nudibranchia). Asian Marine Biology, 7: 31-79

Authorship details
Rudman, W.B., 2001 (July 5) Chromodoris orientalis Rudman, 1983. [In] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/factsheet/chroorie

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