March 12, 2000
From: Yasuhiro Shirai
I attached 2 image file in this mail. I think this animal is Rostanga sp perhaps Rostanga orientalis?.
Could you please identify it for me?
Location: Shima Pref. Mie, Japan (Kii Peninsula, east coast)
Water temperature: 15C
Depth: 3m Crawling on rock.
firstname.lastname@example.orgShirai, Y., 2000 (Mar 12) Rostanga orientalis? from Japan. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/2059
Your animal is definitely a species of Rostanga and could easily be Rostanga orientalis, which has similarly shaped rhinophores, and can have scattered white and/or brown specks.
Unfortunately, species of Rostanga are quite difficult to separate on external characters, although very simple to distinguish anatomically. All the species we have information on are also easy to distinguish on the shape of their egg masses.
So at this stage all I can say is it is possibly Rostanga orientalis.