OKINAWAN
OPISTHOBRANCH OF THE WEEK

Chelidonura pallida Risbec, 1951 (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:

        Chelidonura pallida is unknown from Okinawa Island as of mid-January, 2002, but the close proximity of the main island of Okinawa to the Kerama Islands, as well as the similar opisthofauna to that of the Kerama Islands, suggests the possibility that it is also present here on Okinawa proper. The above featured animal is one which was photographed in the waters of Amuro Island, one of a series of islands in the Kerama Islands Group, which are located 30 ~ 40 kilometers west of the Okinawa capitol, Naha. The featured animal was photographed by Atsushi Ono during July of 1999, on a rock in 5m of water. Atsushi's photograph is used here with his kind permission and he considers the species to be uncommon in the Kerama Islands; Atsushi reports (per. comm.) seeing in excess of ten individuals in the Keramas, but only a single individual has been collected (a second short-tailed form of the species was photographed but not collected).

        Chelidonura pallida is similar to C. electra, however C. electra lacks the bright yellow and black emarinations of the cephalic, parapoidal, and caudal edges of C. pallida. For comparison of these two similar species, Mike Miller (1999) has posted on his Slug Site an excellent image of C. electra, which was taken by Mary Jane Adams in Papua New Guinea.

        C. pallida is one of seven described members of the genus known from Okinawan waters. The seven species found here are:

Literature Cited:


Page Date: 21 Jan '02
Page Modification Date: 02 Jun '03
Digitally manipulated photo
Copyright © 2003 Robert F. Bolland