Revised descriptions of New Zealand Cenozoic Mollusca from Beu and Maxwell (1990)
(Pl. 3k, l): GS9957, J40/f6608, South Branch, Waihao River near "Pentland Hills", Mangaorapan ? (GNS)
Beu & Maxwell (1990): Chapter 6; p. 92; pl. 3 k, l.
Synonymy: Notocallista hectori Finlay & Marwick 1937, p. 101
Classification: Veneridae: Pitarinae
Description: Rather small for family (length 12-25 mm), ovate, moderately inflated. Lunule small, scarcely impressed; no escutcheon. Commarginal sculpture of prominent rounded costae, interspaces typically similar in width to costae, or wider. Left hinge with prominent anterior lateral tooth parallel to lunular margin, a thin, vertical anterior cardinal, a triangular median cardinal and a horizontal, lamellar posterior cardinal tooth. Right hinge with deep anterior lateral socket bounded by low lateral teeth, parallel narrow anterior and median cardinals, and a thin, bifid posterior cardinal tooth. Pallial sinus moderately deep, rounded, slightly ascending. Inner margins smooth.
Comparison: The type species of Costacallista is a relatively large Recent Indo-Pacific species, C. erycina (Linne, 1758), but in New Zealand the genus is not known later than Bortonian, and all assigned species are relatively small. The similarity to Recent species, therefore, is possibly due to convergence.
Distribution: Dannevirke Series, probably about Mangaorapan-Porangan, Castle Hill Shaft, Kaitangata (type); Kauru Formation, Otaio Gorge; South Branch, Waihao River near "Pentland Hills" (common). The type material consists of badly decorticated shells imbedded in very hard matrix, and is rather less elongate than the Otaio Gorge or Waihao specimens, which suggests that the latter material may not be conspecific.
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)