OKINAWAN
OPISTHOBRANCH OF THE WEEK

Chromodoris verrieri (Crosse, 1875) 6mm
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 Chromodoris verrieri here in the waters of Okinawa's main island. Atsushi Ono mentions (pers. comm.) that the above featured animal is the only one he's seen in the Keramas* and of course considers the species to be very rare there. Atsushi reports that this animal was found on rock in a reef environment.

        The following partial description of Chromodoris verrieri is taken from Rudman (1985):

        Colour: The mantle is opaque white with a bright red band at the edge and a submarginal bright yellow line of equal width. The rhinophore stalks are transparent, and the clubs red, the edge of each lamellae being white. The gills are translucent edged in white. The underside of the mantle is white except for the red and yellow border of the mantle showing through. The foot is also white.
        In photographs of specimens from Hawaii it appears that no red is present in the rhinophore club of Hawaiian specimens.
        Shape: The mantle is elongately oval with a broad mantle overlap, the foot extending behind the mantle when the animal is crawling. The simple gills are arranged in a circle around the anus.

        There are two similar appearing chromodorids found in the waters of Okinawa's main island, Chromodoris rubrocornuta and C. sinensis. However, the red and yellow bands of equal width near the mantle's edge of C. verrieri would appear to separate the above featured species from the other two. Of the two species most similar in appearance to C. verrieri, C. sinensis is the closest in terms of color. The red outer color band on the mantle is right at the edge in C. verrieri, however in C. sinensis it is submarginal, with a narrow, marginal band of translucent white.

Literature Cited:


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


Page Date: 28 Mar '05
Page Modification Date: 28 Mar '05
Digitally manipulated photo (image has been horizontally flipped)
Copyright © 2005 Robert F. Bolland