May 29, 2002
From: Atsushi Ono
About "Hopkinsia? or Okenia?". I'm sorry I did not count their appendages. I also should have use my both hands ....
I think attached is Siphopteron citrinum. This species has long pointed posterior projection.
Is this idea right?
3mm long, at 5m depth, Kerama Is. near Okinawa Japan.
email@example.comOno, A., 2002 (May 29) Gastropteron from Japan. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/6427
I suspect this may be the same as your Siphopteron sp. 2. Certainly it is very similar in body shape, and lacks any colour pattern. Siphopteron citrinum (Carlson & Hoff, 1974) from the original description seems to be a more elongate species with the posterior flagellum being dorsally placed rather than posteriorly as in your animal. Also in S. citrinum the the animal has a distinctly golden yellow colour, and the posterior flagellum and the tip of the siphon are dark brown or black.