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. 31b): GS7176, M34/f7302, Middle Waipara River opposite "The Deans", North Canterbury, Waipipian or Mangapanian (GNS) |
 (Pl. 31e): GS7176, M34/f7302, Middle Waipara River opposite "The Deans", North Canterbury, Waipipian or Mangapanian (GNS) |
 (Pl. 31h): GS7176, M34/f7302, Middle Waipara River opposite "The Deans", North Canterbury, Waipipian or Mangapanian (GNS) |
Beu & Maxwell (1990): Chapter 14; p. 274; pl. 31 b,e,h.
Synonymy: Acanthochitona (Notoplax) n. sp. C, Beu & Maxwell 1990, p. 274, pl. 31b, e, h.
Classification: Acanthochitonidae
Description: Similar to Notoplax mariae (Nukumaruan-Recent; Pl. 44a, d, h) but reaching a larger size (median valve to 14 mm wide, 9 mm long), having markedly thicker and heavier valves, all valves are a little shorter and wider, the tegmental granules are more nearly oval or subcircular, and the tegmentum of the very large anterior valve (10.0 mm wide, 6.5 mm long) is more weakly lobate and bears lower radial ridges than that of N. mariae. The large size, thick shell, and very shallow-water environment suggest that this species may be more closely related to the living intertidal species N. violacea (Quoy & Gaimard) than to N. mariae.
Comparison: See description.
Distribution: Waipipian or perhaps Mangapanian, Middle Waipara River at end of ridge opposite "The Deans", North Canterbury, fairly common in shallow-water sandstone with diverse Mollusca (see also Chiton n. sp. aff. glaucus, below); we have not seen similar specimens from any other locality.
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)