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. 22c): GS9685, J41/f9499B, Pukeuri road cutting, Oamaru, Altonian (GNS) |
Beu & Maxwell (1990): Chapter 11; p. 214; pl. 22 c.
Synonymy: Ptychatractus pukeuriensis Suter 1917, p. 26; Brocchina [sic] pukeuriensis; Narona (Inglisella) pukeuriensis
Type species of Inglisella Finlay, 1924
Classification: Cancellariidae: Cancellariinae
Description: Very small for family (height 5-7.7 mm), elongate-ovate, spire 0.6 total height. Protoconch dome-shaped, of about 3 whorls, last quarter whorl with axial costellae, remainder smooth. Teleoconch of 5-5.5 whorls, early whorls biangulate, later ones evenly convex or weakly shouldered; last whorl feebly excavated. Axial sculpture of prominent rounded costae reaching from suture to suture on spire, dying out on base of last whorl; varices at irregular intervals; 9-10 costae and varices on penultimate whorl. Spiral sculpture of narrow cords, 6-10 on penultimate whorl, an additional 8-12 on last whorl. Aperture pyriform, anterior end narrowly rounded; columella subvertical, almost straight except for slight twist to left near anterior end, defining a short siphonal spout, bearing 2 plaits of variable strength. Inner lip thinly callused; outer lip with heavy rounded varix behind leading edge and a shallow V-shaped notch above middle, bearing in most specimens 4 or 5 (as many as 7) lirae within.
Comparison: Inglisella pukeuriensis is distinguished from other New Zealand species of Inglisella by its relatively small protoconch, its slender shape, its convex adult teleoconch whorls, and its prominent axial sculpture. Inglisella ranges from about mid-Dannevirke Series (? Mangaorapan) to Opoitian in New Zealand and seems to have been particularly speciose during the Otaian and Altonian; at several localities (including Pukeuri road cutting) from two to four species occur together and require careful examination before they can be separated. The genus seems to have been bathymetrically tolerant—some species occur in very shallow-water faunules, but most species are recorded from mid to outer shelf or upper bathyal deposits.
Distribution: Altonian; Mount Harris Formation, Pukeuri road cutting, Oamaru (type); Awamoa Creek; Old Rifle Butts; Ardgowan Shellbed; Target Gully Shellbed, 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
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Zealand)