Revised descriptions of New Zealand Cenozoic Mollusca from Beu and Maxwell (1990)
| | Revised descriptions of New Zealand Cenozoic Mollusca from Beu and Maxwell (1990) |
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  (Pl. 9k): holotype, GS1982, J42/f6493, Gee's Point, Kakanui, Whaingaroan (TM5149, GNS) |
Beu & Maxwell (1990): Chapter 9; p. 134; pl. 9 k.
Synonymy: Tatara flemingi Beu & Maxwell 1987, p. 53
Classification: Cancellariidae: Cancellariinae
Description: Size moderate for family (height 35 mm), very similar to T. revoluta (Pl. 8k) but smaller, a little wider, with a shorter spire, finer sculpture caused by weaker axial costae and the presence of a prominent secondary spiral cord in each interspace, a similar but slightly flatter, laterally sinuous outer lip inclined at 20° to the coiling axis, and with more numerous transverse ridges on outer lip (18-20 compared with 14 in T. revoluta), only 2 rather than 3 prominent columellar plaits, and weaker varices than T. revoluta.
Comparison: Except for a doubtful Whaingaroan occurrence, the similar but more coarsely sculptured species Tatara revoluta is recorded only from late Kaiatan tuffs at Lorne. Other taxa are distinguished and the family relationship discussed under T. revoluta, above.
Distribution: Runangan-Whaingaroan; Whaingaroan, Deborah volcanic Formation, Gee's Point, Kakanui (type); tuffs below limestone, Everett's Quarry, Kakanui; Totara Limestone, Trig M, Totara. Rare at all localities.
Cite this publication as: "A.G. Beu and J.I. Raine (2009). Revised
descriptions of New Zealand Cenozoic Mollusca from Beu and Maxwell (1990). GNS
Science miscellaneous series no. 27."
© GNS Science, 2009
ISBN
978-0-478-19705-1
ISSN 1177-2441
(Included with a PDF facsimile file
copy of New Zealand Geological Survey Paleontological Bulletin 58 in CD version
from: Publications Officer, GNS Science, P.O. Box 30368 Lower Hutt, New
Zealand)