GNS Science

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

New Zealand Cenozoic Mollusca

Polinices (Polinella) finlayi (Marwick, 1924)


(Pl. 2j): GS10195, I44/f8486, Boulder Hill, Wangaloan (GNS)


(Pl. 2k): GS10195, I44/f8486, Boulder Hill, Wangaloan (GNS)

Beu & Maxwell (1990): Chapter 5; p. 81; pl. 2 j, k.

Synonymy: Uber finlayi Marwick 1924d, p. 565; Polinella finlayi

Classification: Naticidae: Poliniceinae

Description: Size moderate for genus (height 25-45 mm), ovate or globose, spire low, pointed. Protoconch not distinguishable from teleoconch in available material, about 6 whorls in all, last strongly convex, capacious. No sculpture apart from growth lines. Aperture semicircular, inner lip almost straight except for shallow excavation near adapical end in most specimens. Inner-lip callus relatively narrow for genus, typically parallel-sided over most of its length, lacking definite transverse grooves, filling umbilicus completely in some shells, but leaving a shallow depression or groove in others. Outer lip slightly sinuous, strongly prosocline, inclined at about 35° from shell axis.

Comparison: Polinices (Polinella) finlayi differs from younger species of Polinices (Polinella) in having a much more strongly inclined outer lip and in lacking transverse grooves on the inner-lip callus. Except for a possible occurrence in the Late Cretaceous Quiriquina fauna of Chile, Polinella appears to be endemic to New Zealand, where it ranges from Wangaloan to Waipipian. Polinella is generally regarded as a subgenus of Polinices, differing from typical species of that taxon in having a much more restricted callus and, in most species, transverse grooves on the callus, although the difference is subtle. Polinella seems to have been bathymetrically more tolerant than Polinices (sensu stricto); the two taxa occur together in some shallow-water (inner or middle shelf) assemblages, but species of Polinella are more characteristic of outer shelf or upper bathyal sediments.

Distribution: Wangaloan, Boulder Hill (type); Wangaloa (common at both 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)


Back to index page