Coriocella sp. 1 (68mm)

Opisthobranch-like Animal of the Week Data


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

Species Account:

        I've decided to depart from the usual opisthobranch presentation with the above featured animal. Although it superficially resembles an opisthobranch, it in fact is classified into an entirely different group of molluscs, the Prosobranchia. The conventional schema of mollusc classification is to divide the Class Gastropoda into the following three Subclasses:

        There is a fair amount of confusion concerning the family designation of this group of prosobranchs. I've opted to use the Family Lamellariidae which is composed of about six genera (Dave Behrens, pers. comm.), including, Coriocella, Lamellaria, Marsenina, Marseniopsis, and Mystinconchya.

        Coriocella sp. 1 is considered to be very rare on Okinawa's main island as I have seen and collected only the above featured animal. This unusual animal was found during a mid-morning dive from beneath a large slab of coral rubble in an area of mixed sand and strewn coral rubble. Atsushi Ono (1999) has an apparent identical animal (80mm) which was photographed in the Kerama Islands (located 30 ~ 40 kilometers west of the Okinawa Capitol, Naha) depicted in his book on page ten. I've added a second page with a "foot view" of the same featured animal; this image shows a bit of the lower head detail as well as the crawling surface of the foot.

        I've recorded two separate species of Coriocella here on Okinawa's main island:

Literature Cited:

Page Date: 18 Nov '02
Page Modification Date: 25 Aug '03
Digitally manipulated photo
Copyright © 2003 Robert F. Bolland