Rhytida greenwoodi stephenensis is a subspecies of medium-sized, air-breathing, predatory land snail, a terrestrial pulmonate gastropod mollusc in the family Rhytididae.
This snail is endemic
to Stephens Island
in Cook Strait
, New Zealand
The shell is larger than typical Rhytida greenwoodi
subspecies, but much more loosely coiled, and with considerable acceleration of the last whorl
. The oblique spiral ridges extend strongly on to the dorsal
surface, thereby intensifying the malleated appearance of the subsidiary sculpture
. The shell colour is olive-green, without an umbilicus
The shell diameter is up to 34 mm
, and height up to 19 mm.
- Powell A. W. B., New Zealand Mollusca, William Collins Publishers Ltd, Auckland, New Zealand 1979 ISBN 0-00-216906-1