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. 51e): Cosa wanganuica Finlay, 1930; topotype?, GS4104, R22/f6518, Pinnacle Sand, Castlecliff, Wanganui (Castlecliffian) |
  (Pl. 51g): Cosa wanganuica Finlay, 1930; topotype?, GS4104, R22/f6518, Pinnacle Sand, Castlecliff, Wanganui (Castlecliffian) |
 (Pl. 51h): Cosa wanganuica Finlay, 1930; topotype?, GS4104, R22/f6518, Pinnacle Sand, Castlecliff, Wanganui (Castlecliffian) |
Beu & Maxwell (1990): Chapter 17; p. 374; pl. 51 e,g,h.
Classification: Philobryidae
Description: Height 2.2 — 3.8 mm, quadrate, strongly inflated, beaks situated close to anterior end. Prodissoconch prominent, strongly marked off from rest of shell. Radial sculpture of prominent costae of flattened, rounded or triangular section, scaly in some species, bearing a median groove in others. Commarginal sculpture of fine ridges or lamellae. Hinge line with numerous taxodont teeth, bearing an obliquely triangular resilifer beneath beak. Ventral margin strongly crenulate.
Comparison: Cosa is distinguished from Philobrya by its more robust shell and prominent radial sculpture.
Distribution: Waitakian-Recent, New Zealand; Recent, south-eastern Australia. Recent species range from shallow waters down to the upper bathyal zone.
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)