OKINAWAN
OPISTHOBRANCH OF THE WEEK

Facelina rhodopos Yonow, 2000 (25mm)
Photo by Atsushi Ono

Opisthobranch of the Week Data

Taxonomy:

Frequency on Okinawa: Collection Data:
[brackets indicate range for all Okinawa-collected specimens of the species]


Species Account:

        I've not personally seen Facelina rhodopos here in the waters of Okinawa's main island, however Atsushi Ono mentions (pers. comm.) seeing "many specimens" in the Keramas* and he of course considers the species to be common there. Atsushi also reports the above featured animal was found on fire coral (Millepora sp.) during a night dive from 2 meters of water off Zamami Island.

        I've added a second page with addition images of F. rhodopos, these images are also from the Keramas and kindly furnished by Atsushi.

        Facelina rhodopos was originally described by Yonow (2000). Unfortunately I don't have Yonow's publication available and I've taken the following description of the species from comments by Yonow (2003) on Bill Rudman's Sea Slug Forum:

Body, cerata and tentacles translucent yellow to orange. Body moderately narrow with wider foot. Foot much longer than body and marked with a central longitudinal peach or pink band. Cerata, in seven or eight clusters of 6-15, usually club-shaped with a terminal nipple, sometimes fusiform, are translucent with an opaque peach or pink ring distally. The tip always white.
Rhinophores, propodial tentacles and long oral tentacles pale to bright orange with white distal speckling. Rhinophores obliquely lamellated and slightly longer than the large propodial tentacles but only one third the length of the oral tentacles. Tentacle tips may be white. Head and cardiac region brighter in colour and eyes visible at base of rhinophores. Reddish brown digestive gland visible as a central extension only. Genital swelling observed under or among the first cluster of cerata.

Literature Cited:


        * Keramas = the Kerama Islands Group, located 30 ~ 40 kilometers west of the Okinawa capitol, Naha.


Page Date: 23 May '05
Page Modification Date: 23 May '05
Digitally manipulated photo
Copyright © 2005 Robert F. Bolland