OKINAWAN
OPISTHOBRANCH OF THE WEEK

Platydoris sp. 1 (35mm)
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:

        Platydoris sp. 1 is considered to be uncommon in Okinawa waters. I've not personally seen this platydorid here in the waters of Okinawa's main island. Atsushi mentions (pers. comm.) seeing in excess of ten individuals in the Keramas* and considers this animal to be uncommon there. Atsushi found the above featured animal on the underside of a rock in 18m of water.

        This same animal is seen in Atsushi Ono's recent book (2004, p. 147, as Platydoris tabulata). Atsushi mentions (pers. comm.) that he has made an error in the book and agrees with Dorgan, et. al. (2002) that P. tabulata should be considered to be nomen dubium. Atsushi now considers this animal to be Platydoris species.

        The following information concerning the status of P. tabulata is taken from Dorgan et. al. (2002):

Remarks. Platydoris tabulata is only known from a single preserved specimen. Abraham's (1877) original description of P. tabulata is very incomplete and does not include colour or anatomical data. The holotype of this species (BMNH 19990446), was reexamined here, but the external coloration was almost completely faded. Also, the anterior part of the viscera of the specimen had been removed, and it lacked the radula and the reproductive system.

        As it is impossible to identify the type material of P. tabulata with any species of Platydoris, there are no subsequent records of this species, and the original description is too incomplete to allow a positive identification, this name is here regarded as a nomen dubium.

        I've previously featured on these pages the following Platydoris species:

  • P. cruenta
  • P. formosa
  • P. sanguinea
  • P. scabra
  • Literature Cited:


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


    Page Date: 13 Dec '04
    Page Modification Date: 13 Dec '04
    Digitally manipulated photo
    Copyright © 2004 Robert F. Bolland