GNS Science

Revised descriptions of New Zealand Cenozoic Mollusca from Beu and Maxwell (1990)

New Zealand Cenozoic Mollusca

Ongleya tholispira Finlay & Marwick, 1937


(Pl. 2x): paratype, GS1494, M46/f9500, Wangaloa, Wangaloan (TM5748, GNS)

Beu & Maxwell (1990): Chapter 5; p. 86; pl. 2 x.

Synonymy: Ongleya tholispira Finlay & Marwick 1937, p. 91

Type species of Ongleya Finlay & Marwick, 1937

Classification: Acteonidae

Description: Moderately large for family (height c. 14 mm), broadly ovate. Protoconch heterostrophic, initial whorl small. Teleoconch of about 4 strongly convex whorls, last whorl very large, oval, with small pseudumbilicus. Sculpture of numerous strong spiral cords (c. 40 on last whorl) separated by deep, wide grooves that form regular pits where intersected by axial costellae. Aperture large, columella rather short with 2 distant, high plaits. Outer lip thin, not denticulate, strongly prosocline except near suture.

Comparison: Ongleya is monotypic, but is closely related to Tornatellaea Conrad, 1860 — which also occurs at Wangaloa and Boulder Hill — differing from it in having a domed rather than a conic spire, and a strongly prosocline rather than an opisthocline outer lip.

Distribution: Wangaloan, Wangaloa Formation, Wangaloa (type) (rare).

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)


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