Elysia trisinuata
Baba, 1949

Superfamily: ELYSIOIDEA
Family: Elysiidae


Japan, Hong Kong, Hainan Is.


On intertidal encrusting green alga Codium arabicum, Miura Peninsula, Japan. Photo: Yoshi Hirano.

First described by Baba (1949) from Sagami Bay, it has since been reported by Jensen (1998) from southern China. It is a fairly uniform grass green with fine orange red spots scattered all over the body and outside of the parapodia. It also has scattered white conical, unbranched papillae. The rhinophores are tipped with black or grey. The uniform green colour of the body and parapodia results from a fine network of ducts, packed with chloroplasts, scattered throughout the body wall (see lower photo). This species usually has three raised folds along the parapodial edge which is the reason for the name trisinuata. The specimen photographed has only two folds, perhaps because of damage to the posterior part of the parapodia.

See Cynthia Trowbridge's message below.

• Baba, K. (1949) Opisthobranchia of Sagami Bay collected by His Majesty, the Emperor of Japan. Iwanami Shoten, Tokyo.
• Jensen, K.R. (1985) Annotated checklist of Hong Kong Ascoglossa (Mollusca:
Opisthobranchia), with descriptions of four new species. In: Proceedings of the 2nd International Workshop on the Malacofauna of Hong Kong and Southern China, Hong Kong, 1983. (Eds: Morton,B; Dudgeon,D) Hong Kong University Press, Hong Kong, 77-107.
• Jensen, K.R. (1992). Anatomy of some Indo-Pacific Elysiidae (Opisthobranchia: Sacoglossa [=Ascoglossa]), with a discussion of the generic division and phylogeny. Mal. Soc. London, 58: 257-96.
• Jensen, K.R. (1998) Zoogeographic affinities of Hong Kong Opisthobranchia (Mollusca, Gastropoda). In: Morton B (ed.) The Marine Biology of the South China Sea. Hong Kong University Press, Hong Kong, p 43-55.

Authorship details
Rudman, W.B., 2000 (September 24) Elysia trisinuata Baba, 1949 . [In] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/factsheet/elystris

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