(Baba & Tokioka, 1965)
Known only from Japan.
Shima Pref. Mie, Japan (Kii Peninsula), Depth: 2-3m, Length: 4-10mm, Jan - Feb. 2000. PHOTO: Yasuhiro Shirai.
Originally described from a single 4mm long specimen [Etizen Coast, Japan Sea side of Honshu Id]. The dorsal hump and outer surfaces of the parapodia were deep choclate brown and their were irregular white markings, towards the margin in the case of the paraoodia. The tip of the siphon and the edge of foot and parapodia were described as deep vermillion. I don't think there is much doubt that the animal photographed here is S. fuscum.
•Baba, K. & Tokioka, T. (1965). Two more species of Gastropteron from Japan, with further notes on G. flavum (Gastropoda: Opisthobranchia). Publications of the Seto Marine Laboratory, 12(5): 363-379.
Rudman, W.B., 2000 (February 25) Siphopteron fuscum (Baba & Tokioka, 1965). [In] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/siphfusc
February 26, 2000
From: Yasuhiro Shirai
Thanks for your help. I have sometimes found this opisthobranch at Shima Prefecture, Mie, Japan. I think that it is Siphopteron sp. but I don't know this animal's real name. I searched in some books, but without success. Could you please identify it for me?
Location: Shima Pref. Mie, Japan (Kii Peninsula, east coast)
Water temperature: 14C
Date Jan. 2000-Feb.2000
Crawling on rock or crawling on seaweed.
email@example.comShirai, Y., 2000 (Feb 26) Siphopteron fuscum from Japan. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/1968
This is an interesting find. I think it is an animal described by Baba & Tokioka in 1965 as Gastropteron fuscum. I don't know of any record of it being found since then.
In Terry Gosliner's revision of the family (1989) he placed it in the genus Siphopteron. It is certainly a spectacular looking, and easily recognised, species.