Cerberilla annulata (Quoy & Gaimard, 1832) 10mm
Photo by Atsushi Ono

Opisthobranch of the Week Data


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

Species Account:

        Cerberilla annulata is unknown from Okinawa's main island as of early-December, 2005. The only Cerberilla species I've collected from Okinawa's main island, as of the current date, is C. affinis. The above featured animal is one which was photographed from a sandy bottom environment off of Aka Island, one of a series of islands in the Kerama Islands Group, which are located 30 ~ 40 kilometers west of the Okinawa capitol, Naha. This featured animal was photographed by Atsushi Ono during May of 2004 in seven meters of water. Atsushi's photograph is used here with his kind permission. It should be noted that Atsushi considers the species to be very rare in the Kerama Islands as he has seen only the above featured individual (pers. comm.).

        This attractive sand-dwelling aeolid apparently has a wide tropical Indo-West Pacific distribution. Bill Rudman (1999) reports in the Sea Slug Forum on published records of the species from New Guinea and Tahiti. Rudman has found it in Zanzibar, Tanzania and New Caledonia. In addition, there are image links on the Sea Slug Forum suggesting the species may well be found in Australia, the Marshall Islands, and the Red Sea.

        The relatively long cerata, white body and cerata, and the upper yellow and lower black band near the ceratal tip characterize the species.

        In addition to the above featured C. annulata, the following Cerberilla species have been previously featured on these pages:

Literature Cited:

  • Rudman, W.B., 1999 (November 25). Cerberilla annulata (Quoy & Gaimard, 1832). [In] Sea Slug Forum. Australian Museum, Sydney. Available from:

Page Date: 05 Dec '05
Page Modification Date: 01 Aug '16
Digitally manipulated photo
Copyright © 2016 Robert F. Bolland