February 4, 2002
From: Bill Rudman & Brian Darvell
Very similar to Hopkinsia pilosa in shape and colour but differs in having only a few long rounded papillae on the mantle. There is usually one in the middle of the back and about five down each side near the mantle edge. In Japanese and Hong Kong specimens there are small brown specks all over the mantle and body but in Australia and New Zealand there are much larger brown patches. Hopkinsia plana is reported to feed on the colonial bryozoan Membranipora membranacea, a common fouling organism on wharf piles, and algae. Specimens from Hong Kong, 10 mm long preserved, have been found on an as yet unidentified bryozoan.
AM C150268, 5 April 1986, Site 5.128, Heung Lo Po (E), Tolo Channel, 1 m . Photos: Brian Darvell.
Hong Kong Collection Records:
AM C150268, 5 April 1986, Site 5.128, Heung Lo Po (E), Tolo Channel, 1 m (prey only). AM C138144, 20 February 1983, Site 14.41, Tai Tam Harbour, Hong Kong Is., 1 m. AM C139053, 19 specimens, 11 April 1983, Site 4.59, Gau Tau (N), Mirs Bay, 5-12 m. AM C139054, 12 April 1983, Site 2.61, Bluff Head, Tolo Channel, 4-7 m. AM C139055, 6 specimens, 14 April 1983, Site 2.32, Round Is. (E), Mirs Bay, 3-10 m. AM C141489, 5 specimens, 25 February 1984, Site 10.99, Kiu Tau (W), Kiu Tsui Chau, Port Shelter, 4-7 m. Depth range: 0.5-12 m.
• 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
Bill Rudman & Brian Darvell