Rhytida greenwoodi webbi

Taxobox
name = "Rhytida greenwoodi webbi"


image_caption =
status = Endangered
regnum = Animalia
phylum = Mollusca
classis = Gastropoda
ordo = Pulmonata
familia = Rhytididae
genus = "Rhytida"
species = "R. greenwoodi"
subspecies = "R. greenwoodi webbi"
trinomial = "Rhytida greenwoodi webbi"
trinomial_authority = Powell, 1949

"Rhytida greenwoodi webbi" is a subspecies of medium-sized, air-breathing, predatory land snail, a terrestrial pulmonate gastropod mollusc in the family Rhytididae.

Distribution

This subspecies of land snail is endemic to the South Island of New Zealand. It is found around the Nelson area, at the north of the South Island.

Habitat

This snail is typically found under clumps of Astelia.

hell description

The shell is of similar size and shape to the typical "greenwoodi" subspecies, but with a more depressed spire, more vertically compressed whorls and only obsolescent oblique ridges over the peripheral area. Umbilicus one fifth to one sixth major diameter of base, and lacking a subangular bounding ridge. The sculpture is as in the typical "greenwoodi" subspecies. The shell coloration is reddish-brown above, yellowish-brown below, without an umbilical dark zone.

The egg is almost double the size of that of typical "greenwoodi" subspecies. The shell diameter is up to 26 mm, and height up to 13 mm.

References

* Powell A. W. B., "New Zealand Mollusca", William Collins Publishers Ltd, Auckland, New Zealand 1979 ISBN 0-00-216906-1