OKINAWAN
OPISTHOBRANCH OF THE WEEK

Thuridilla livida (Baba, 1955) 15mm

Opisthobranch of the Week Data

Taxonomy:

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


Species Account:

        Thuridilla livida is considered to be rare on Okinawa as I have seen and collected a total of six individuals, although others have been seen but neither photographed nor collected. The species has been reported from Enewetak {Marshall Islands}, Japan (including Okinawa, the Kerama Islands, and mainland Japan), Guam, Aldabra Atoll {Seychelles}, and South Africa.

        T. livida was originally described by Baba (1955), as Elysia livida; Baba's original description was based on a single specimen from Kasajima, Sagami Bay, Japan, in August of 1950. I've included a replication of the original species illustration from Baba (1955).

        T. livida is characterized by the orange, black, and bright blue lines along the outer edge of the parapodia. On Okinawa T. livida most closely resembles T. hoffae, but in the case of T. hoffae there is a series of blue to blue-green patches (Gosliner 1995) on the sides of the parapodia. External appearance of the Okinawa material is consistent with that of animals found on Guam (Carlson & Hoff, 1978).

        Thuridilla undula is one of eleven described species of Thuridilla found in Okinawan waters. The eleven species are:

  • T. albopustulosa
  • T. bayeri
  • T. carlsoni
  • T. flavomaculata
  • T. gracilis To be featured at an later date
  • T. hoffae
  • T. kathae
  • T. livida (the above featured animal)
  • T. splendens
  • T. undula
  • T. vatae
  • Literature Cited:


    Page Date: 02 Apr '01
    Page Modification Date: 04 Mar '02
    Digitally manipulated photo
    Copyright © 2002 Robert F. Bolland