GNS Science

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

New Zealand Cenozoic Mollusca

Conominolia sulcatina (Suter, 1917)


(Pl. 9l): GS9535, J42/f6031, beach below Everett's Quarry, Kakanui, Whaingaroan (GNS)

Beu & Maxwell (1990): Chapter 9; p. 132; pl. 9 l.

Synonymy: Solariella sulcatina Suter 1917, p. 5

Classification: Solariellidae

Description: Size moderate for family (height 10-12 mm), turbiniform, spire 0.6 total height. Protoconch small, of slightly more than 1 smooth whorl. Teleoconch whorls 6, strongly convex except for a narrow, well-defined sutural shelf; last whorl widely umbilicate. Axial sculpture of weak costellae on sutural shelf of early whorls, obsolete on last 2 or 3 whorls. Spiral sculpture of thin, rather crisp, subequal cords, some with interstitial threads, 1 marking edge of shelf finely beaded by axial costellae on early whorls; 7-9 cords on penultimate whorl. Base of last whorl with 7 or 8 additional cords similar in strength to those above, one on edge of umbilicus somewhat stronger than others. Umbilicus with about 7 cords within, slightly weaker than those on base, and finely beaded in some shells. Aperture circular.

Comparison: Conominolia sulcatina differs from C. conica (Pl. 2a) in having a narrower sutural shelf, crisper spiral sculpture but much weaker axial sculpture, and stronger basal spiral sculpture.

Distribution: Whaingaroan, Deborah Volcanic Formation, Everett's Quarry, Kakanui (type) (moderately common).

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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