Revised descriptions of New Zealand Cenozoic Mollusca from Beu and Maxwell (1990)

Purpurocardia perscrupulosa (Marwick, 1932)

(Pl. 17d): holotype, GS951A, J41/f8475, Target Gully Shellbed, Oamaru, Altonian (TM4320, GNS)

(Pl. 17e): holotype, GS951A, J41/f8475, Target Gully Shellbed, Oamaru, Altonian (TM4320, GNS)

Beu & Maxwell (1990): Chapter 11; p. 184; pl. 17 d,e.

Synonymy: Venericardia perscrupulosa Marwick 1932, p. 497; V. (Purpurocardia) perscrupulosa

Classification: Carditidae: Venericardiinae

Description: Size moderate for family (length 47-57 mm), suboblong, considerably longer than high, beaks situated at about 0.25 anterior-posterior distance; posterior area slightly concave. Lunule small, pouting. Radial sculpture of 25-28 very prominent tuberculate or spinose costae of triangular section, the third one from posterodorsal margin considerably stronger than those on either side and having more prominent scales than other costae. Left hinge with a strong, erect, triangular anterior cardinal tooth free of lunular margin, and a long, slender, slightly arched posterior cardinal. Right hinge with anterior cardinal tooth confluent with lunular margin, a prominent, broadly triangular median cardinal, and a thin posterior cardinal fused to the nymph.

Comparison: Purpurocardia perscrupulosa differs from other New Zealand venericardiines in its relatively elongate shape, its truncate posterior end, and its very prominent, triangular-sectioned, tuberculate radial costae.

Distribution: Altonian-Waiauan; Altonian, Target Gully Shellbed, Oamaru (type); Ardgowan Shellbed, Oamaru; Glenmark Limestone, Weka Pass; Burnt Hill, Oxford; Double Corner shellbeds, Lower Waipara Gorge; "Nissen no. 1 shellbed", Clifden. Uncommon at all 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
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)

References

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