GNS Science

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

New Zealand Cenozoic Mollusca

Dosinia (Austrodosinia) sodalis Marwick, 1929


(Pl. 11c): GS9806, F45/f9668, Shell Gully, Chatton, Duntroonian (GNS)


(Pl. 11e): GS9806, F45/f9668, Shell Gully, Chatton, Duntroonian (GNS)

Beu & Maxwell (1990): Chapter 10; p. 148; pl. 11 c, e.

Synonymy: D. (Raina) sodalis Marwick 1929, p. 913

Classification: Veneridae: Dosiniinae

Description: Size moderate for genus (length 50-60 mm), subcircular, moderately inflated, posterior area slightly concave, posterior end weakly truncate. Lunule small, pouting; escutcheon very well defined, particularly in left valve. Commarginal sculpture of thin, well spaced, erect ridges elevated into prominent lamellae posteriorly and near anterodorsal margin, extending across right escutcheon but stopping abruptly at edge of left escutcheon. Left hinge with a small anterior lateral tooth, a thin anterior cardinal, a narrowly triangular median cardinal, and a thin, grooved posterior cardinal. Right hinge with a shallow anterior lateral socket, a very short anterior cardinal tooth, a narrowly triangular median cardinal and a narrow, bifid posterior cardinal. Pallial sinus moderately deep, triangular, horizontal.

Comparison: Although Dosinia sodalis was originally assigned to the subgenus Dosinia (Raina), the nature of the sculpture (raised into lamellae near the escutcheon), the narrow right posterior cardinal tooth and the horizontal pallial sinus indicate a location in Austrodosinia. It differs from D. (Austrodosinia) anus (Nukumaruan-Recent) in being more strongly inflated and in having coarser sculpture, a more sharply defined escutcheon (particularly in the right valve) and a much smaller left anterior lateral tooth.

Distribution: Duntroonian, Chatton Formation, Shell Gully, Chatton (type) (not uncommon).

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)


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