Rhytida greenwoodi webbi
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| Rhytida greenwoodi webbi Powell, 1949 |
Rhytida greenwoodi webbi is a terrestrial gastropod in the family Rhytididae, endemic to the South Island of New Zealand. It is found around the Nelson area, at the north of the South Island, typically under clumps of Astelia.
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. Sculpture is as in typical greenwoodi subspecies. 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.
Major diameter is up to 26 mm, and height up to 13 mm.
[edit] References
- Powell A W B, New Zealand Mollusca, William Collins Publishers Ltd, Auckland, New Zealand 1979 ISBN 0-00-216906-1
