Shima Pref. Mie Japan, (Kii Peninsula, east coast). 25mm long, Jan. 2000. Depth: 3m. PHOTO: Yasuhiro Shirai.
I think this is Elysia amakusana Baba, 1955 . [Sagami Bay Supplement], which Baba introduced as a 'new name' for the animal figured on Plate 9, fig 27. in Baba, 1949 [Opisthobranchs of Sagami Bay] as Elysia japonica but which is not Eliot's Elysia japonica.
The painting shows brownish mottling on the parapodia and blue on the upper half of the rhinophores and a dark mark at the posterior tip of the body - very like the photo in 19 Feb 2000 message below. Also in the painting there are whitish papillae over parapodia.
See message below.
NOTE: This species was previously labelled Elysia sp. 6.
• Baba, K. (1955) Opisthobranchia of Sagami Bay, Supplement. Iwanami Shoten, Tokyo. 59pp.
Rudman, W.B., 2000 (February 27) Elysia amakusana Baba, 1955. [In] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/factsheet/elysamak
Elysia amakusana from South Korea
From: Dong Bum, Koh, December 3, 2002
Elysia sp. 6. = Elysia amakusana
From: Bill Rudman, February 29, 2000
Re: Elysia sp. 6.
From: Yasuhiro Shirai, February 19, 2000
Elysia from Japan
From: Yasuhiro Shirai, January 30, 2000