OKINAWAN
OPISTHOBRANCH OF THE WEEK

Tambja morosa (Bergh, 1877) size unrecorded, TL ca. 60mm

Opisthobranch of the Week Data

Taxonomy:

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


Species Account:

        Tambja morosa is considered to be rare on Okinawa as I have collected only two individuals over a period of many years of diving here. In addition to the two collected individuals, eight others have been photographed between 3m and 38m of depth. The two collected animals were diminutive in size (at 17 & 26mm), but the majority of photographed animals appeared to have a total length within 40~60mm. All of the Okinawa material which I've observed here is consistent with the color pattern and darkness of the featured animal; the deep blue head band and irregular body spots add a pleasant color contrast the the otherwise dark body. The above featured animal was photographed in 3m of water at the reef forefront in an area made up of a dense stand of arborescent bryozoan colonies.

        The only other large species of Tambja found here is T. sagamiana but the obvious bright orange or yellow pustules covering the mantle surface on T. sagamiana immediately separate the two animals.

        I've collected to date (August, 1999) four species of Okinawa Tambja. The four are:

  • T. amakusana
  • T. limaciformis
  • T. morosa(See featured animal above)
  • T. sagamiana

  • Copyright © 1999 Robert F. Bolland
    Digitally manipulated photo