Revised descriptions of New Zealand Cenozoic Mollusca from Beu and Maxwell (1990)
(Pl. 13a): GS9514, I40/f6678, head of Lake Waitaki, Duntroonian (GNS)
(Pl. 13b): GS9514, I40/f6678, head of Lake Waitaki, Duntroonian (GNS)
Beu & Maxwell (1990): Chapter 10; p. 149; pl. 13 a, b.
Synonymy: Miltha parki Marshall & Murdoch 1921a, p. 79
Classification: Veneridae: Tapetinae
Description: Moderately large for family (length 65-90 mm), ovate, moderately inflated; posterior area well defined. Lunule small, impressed; escutcheon broad, strongly differentiated. Sculpture of closely spaced, thin, low commarginal ridges crossed by numerous radial costellae similar in strength to, or slightly coarser than ridges, producing a finely reticulate effect. Left hinge with a narrow anterior cardinal tooth, a bifid, triangular median cardinal and a thin posterior cardinal. Right hinge unknown. Pallial sinus moderately deep, horizontal, apex rounded. Internal margins smooth.
Comparison: The type material and available topotypes of Tapes parki are poorly preserved steinkerns retaining traces of external sculpture and possibly are not conspecific with the South Island specimens. Tapes parki differs from typical species of the genus in having relatively prominent radial sculpture. Another, related species occurs in the Gee Greensand (Altonian) at Target Gully, Oamaru, differing from T. parki in its smaller and more elongate shell. This warm-water group has been little-known in the New Zealand fossil record, and needs further study.
Distribution: Duntroonian; "Aotea" Sandstone?, Okoko-Kawhia Road, Southwest Auckland (type); Wharekuri Greensand, head of Lake Waitaki; Chatton Formation, Wendon Valley, Southland; ? Shell Gully, Chatton. Moderately common at type locality, uncommon at other 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
(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)