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. 36d): GS4253, Q22/f7544, Upper Waipipi Shellbed, Waverley Beach, west of Wanganui, Waipipian (GNS) |
 (Pl. 36f): GS4253, Q22/f7544, Upper Waipipi Shellbed, Waverley Beach, west of Wanganui, Waipipian (GNS) |
Beu & Maxwell (1990): Chapter 14; p. 284; pl. 36 d,f.
Classification: Veneridae: Venerinae
Description: Moderately large for family (53-61 mm long), relatively high and inflated-oval, with umbones low, at anterior quarter of length; interior of ventral margin finely and closely crenulate; lunule short and moderately wide, not impressed, sculptured as remainder of disc, bordered by a deep, narrow groove. Sculpture of very prominent, high, narrow, smooth commarginal ridges, convex on ventral side and concave on dorsal side, separated by deep, smooth grooves each slightly wider than 1 ridge; ridges narrower and more closely spaced on ends, weakly anastomosing on anterior. Hinge narrow, with deep escutcheon and long, narrow ligamental nymph in each valve; right valve with a thick, slightly curved, grooved posterior cardinal tooth, a thick, strongly curved, deeply grooved median cardinal tooth, and a short, straight, thin anterior cardinal tooth; left valve with a thin, straight posterior cardinal tooth raised above nymph, a short, thick, straight, weakly grooved median cardinal tooth, and a high, thin, curved, weakly grooved anterior cardinal tooth; a short, rounded anterior lateral tooth in left valve and corresponding shallow socket in right valve. Adductor scars large, oval, subequal; pallial sinus short, narrowly triangular.
Comparison: The unnamed species is much more strongly sculptured than the Nukumaruan-Recent Dosina zelandica, and apparently descended from the much larger and more strongly sculptured Miocene species D. firmocosta (Altonian-Lillburnian). Another, apparently related, apparently unnamed, strongly sculptured species (but more elongate and with less prominent ridges than the Waipipi shells) occurs in Maraetotara Formation (early Castlecliffian) at Cape Kidnappers.
Distribution: Waipipian; common in the Waipipi Shellbeds, Waverley Beach, west of Wanganui, and in sandstone in the Wairoa Syncline, northern Hawke's Bay.
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)