Halgerda tessellata (Bergh, 1880) 19mm

Opisthobranch of the Week Data


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

Species Account:

        Halgerda tessellata is considered to be uncommon on Okinawa; I have collected a total of thirteen individuals, but dozens of others have been seen but not collected over a period of many years of diving here. The triangular, orange colored ridges on the animal's upper surface set this dorid apart from all other opisthobranchs found on Okinawa. The specific name of this immediately identifiable dorid means "to form a mosaic pattern", which is quite apparent.

        The featured animal was found in 30ft of water on the wall of a surge channel, amid spur & groove formations near drop off at the reef forefront.

Page Date: 26 January '98
Page Modification Date: 26 January '98
Digitally manipulated photo
Copyright © 1998 Robert F. Bolland