Chromodoris orientalis from Hong Kong

July 15, 2001
From: Bill Rudman & Brian Darvell

To accompany Leslie Chan's photos, here is some information and photos on Chromodoris orientalis from Brian Darvell's Hong Kong collections.

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. It grows to at least 30 mm. Originally reported from Japan, as Chromodoris pallescens (Eliot, 1913) it has also been recorded from Hong Kong (Orr 1981; Rudman 1983).

Hong Kong Collection Records:
AM Cl33721, 28 February 1982, Site 8.17, Bluff Is. (NE), 6 m. AM C 133722, 3 specimens, 6 March 1982, Site 10. 18, Shelter Is. (SE), Port Shelter, 7-14 m. AM C135232, 11 July 1982, Site 8.31, Kong Tau Pai (N of Wang Chau), 9 m. AM C138130,2 January 1983, Site 8.38, Long Ke Wan (NE side), 6 m. AM C138131, 8 January 1983, Site 11.39, Tiu Chung Chau (SW), Port Shelter, 10 m. AM C138132, 2 specimens, 6 February 1983, Site 11.42, Ping Min Chau (S), Port Shelter, 11 m. AM C138133, 2 specimens, 20 February 1983, Site 9.44, reef, Rocky Harbour, 9 m. AM C140157, 4 June 1983, Site 10.10, Shelter Is. (SE), Port Shelter, 10 m. AM C142157, 2 specimens, 24 March 1984, Site I 1. I 00, rock E of Ma Tsai Pai, Rocky Harbour, 10 m. AM C145289, 2 specimens, 23 September 1984, Site 2.155, Round Is. (S), Mirs Bay, 12 m. AM C150349, 3 specimens, 4-20 April 1986, (Tolo Harbour, Mirs Bay). Depth range: 2-20 m.

Reference:
• 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.

Best wishes,
Bill Rudman & Brian Darvell

Rudman, W.B. & Darvell, B.W., 2001 (Jul 15) Chromodoris orientalis from Hong Kong. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/4803

Factsheet

Chromodoris orientalis

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