GNS Science

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

New Zealand Cenozoic Mollusca

Latirogona ornata (Marshall, 1918)


(Pl. 25s): holotype, Pakaurangi Point, Kaipara Harbour, Altonian (TM 6855, GNS)

Beu & Maxwell (1990): Chapter 11; p. 230; pl. 25 s.

Synonymy: Dolicholatirus ornatus Marshall 1918, p. 264

Type species of Latirogona Laws, 1944

Classification: Turbinellidae

Description: Rather small for family (height 25 mm), fusiform, spire half total height. Protoconch conical, of 3.5 whorls, lower suture margined by a narrow cord, last fifth of a whorl with axial costae, otherwise smooth. Teleoconch of about 6 whorls, spire whorls strongly convex, last whorl excavated with a long, slender neck. Axial sculpture of very prominent, rounded, prosocline costae with broad interspaces, reaching from suture to suture on spire, and over base on last whorl; 7 costae on penultimate whorl. Spiral sculpture of numerous closely spaced fine cords and threads, the coarser ones slightly thickened where they surmount axial costae, all finely granulated by growth lines. Aperture ovate, very constricted, with a long, almost straight siphonal canal. Inner lip thinly callused, columella with 2 or 3 definite plaits and 3-6 additional short ridges and tubercles; parietal region with 2-4 short ridges. Outer lip with 9-11 narrow lirae within.

Comparison: Latirogona is a monotypic genus similar to Dolicholatirus Bellardi, 1884, but apparently differing in having a conical rather than a mamillate protoconch, in being less slender, and in having a more strongly and elaborately armoured aperture. Dolicholatirus was transferred to the Turbinellidae by Vermeij & Snyder (2006), who are followed here.

Distribution: Altonian, Pakaurangi Formation, Pakaurangi Point, Kaipara Harbour (type) (uncommon).

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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