Hypselodoris kanga from Hong Kong
July 16, 2001
From: Bill Rudman & Brian Darvell
Here is some information and photos on Hypselodoris kanga from Brian Darvell's Hong Kong collections to accompany Leslie Chan's photo.
PHOTO: UPPER: S.Lamma Is, Shum Wan, Hong Kong, 28 Feb 1987 AM C153329. On sponge, Photo: Brian Darvell. LOWER: Hong Kong, April 1983. Photo: B.E Picton.
This is one of a group of similarly coloured species of Hypselodoris which have a bluish background colour and dark blue and yellow spots. Specimens from Hong Kong have a very pale blue or white background colour whereas east African specimens of the same species are a darker blue. The most characteristic feature of H. kanga is that there is a series of bright yellow spots up the outer face of each triangular gill. Each gill is edged in blue. It grows to 40 mm. Of particular interest is the sponge that Brian Darvell has photographed feeding on. I am not sure of its name but it is a dull khaki yellow with a skeleton of dark purple-black fibres. The same, or a very similar sponge has been recorded in eastern Australia as the food of Chromodoris collingwoodi.
Hong Kong Collection Records:
AM C137067, 3 specimens, 14 November 1982, Site 2.32, Round Is. (E), Mirs Bay, 7-12 m. AM C140153, I May 1983, Site 8.38, Long Ke Wan (NE side), 6 m. AM C153328, 14 September 1986, Site 8.175, Kei Kok Tau, nr. Tai Long Wan, 6 m. AM C153329, 28 February 1987, Site 13.96, Shum Wan (W), Lamma Is., 6 m. Depth range: 0-12 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
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