Opisthobranch of the Week Data
I've not personally seen Eubranchopsis virginalis here in the waters of Okinawa's main island. Atsushi Ono has seen only the above featured animal as of March, 2005 and of course considers the species to be very rare in the Keramas.* Atsushi reports (pers. comm.) finding the above featured animal on a buoy chain in seven meters.
Baba (1949) described Eubranchopsis virginalis from three specimens collected during August of 1939 from shallow waters of Hayama, Sagami Bay. Baba (1971) also presents anatomical information from supplimental material concerning the species. The following is taken from Baba's original description:
Length about 12 mm in length. Cephalic tentacles and rhinophores long and slender, the latter simple. Branchial papillae elongate-claviform in 6 oblique rows on either side, about 3 in the 1st and 2nd, 4 in the 3rd, 3 in the 4th, 2 in the 5th. and 1 in the last rows, the outer ones short, the innermost largest, all easily falling off. Tubercles on the papillae acutely conical, usually in 3 circlets with 5-8 in each circlet. No branchial folds are present on the papillae; a cnidosac on the apex of the papillae; foot corners tentaculiform; tall exceedingly long and tapering. General body colour olive-yellow, beautifully ornimented with round spots of deep blue on the back, sides, papillae and tentacles. Vein of papillae faintly vermillion-tinted . . . .
I've added a second page with an image of a drawing from Baba's original description from Hayama, Sagami bay.
Mike Miller has a beautiful photograph of E. virginalis from Lembeh Straits, Indonesia. Additionally, see the following sites for animals from Japanese waters:
Bill Rudman's Sea Slug Forum Jun Imamoto's Sea Slug Site Tomohiko Kurihara's Nudibranch Site
* Keramas = the Kerama Islands Group, located 30 ~ 40 kilometers west of the Okinawa capitol, Naha.