OKINAWAN
OPISTHOBRANCH OF THE WEEK

Hydatina physis (Linnaeus, 1758) 61mm

Opisthobranch of the Week Data

Taxonomy:

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


Species Account:

        Hydatina physis is considered to be uncommon on Okinawa; I have seen and collected a total of four living individuals, and I've collected eight "shell only" specimens (15~29mm) over a period of more than twenty years of diving here. Three of the living animals were collected from Horseshoe Cliffs (4~10ft) and one from Tengan Pier (40ft).


Copyright © 1999 Robert F. Bolland
Digitally manipulated photo