New Zealand Journal of Geology and Geophysics abstracts

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Jurassic Pholadomyidae (Bivalvia) from New Zealand and New Caledonia

H. J. CAMPBELL

Institute of Geological & Nuclear Sciences Ltd
P.O. Box 30 368
Lower Hutt, New Zealand

J. A. GRANT-MACKIE

Department of Geology
The University of Auckland
Private Bag 92019
Auckland, New Zealand

Abstract  Fossil bivalves of the family Pholadomyidae are described from Jurassic sequences of the Murihiku Terrane of New Zealand (Murihiku Supergroup) and New Caledonia (Baie de St-Vincent Group). Four new species and two new subgenera are erected: Pholadomya (Pholadomya) oretiensis n. sp., Hettangian-Sinemurian (Aratauran local stage); Pholadomya (P.) beaumontensis n. sp., probably Aalenian-Callovian (Temaikan); Pholadomya (Kanakimya) uitoe n. subgen. et sp., Aalenian-Callovian (Temaikan); and Pholadomya (Moewakamya) hudsoni n. subgen. et sp., Oxfordian (Heterian). An isolated specimen from the type Temaikan sequence (c. Aalenian), Kawhia Harbour, does not warrant formal naming but is closely related to P. oretiensis. Neither of the new subgenera is yet recognised elsewhere but an exhaustive review of relations within this large genus is long overdue. P. oretiensis and P. beaumontensis show some similarities with contemporary English species, but this is not thought to imply any particularly close evolutionary relationship.

The presence of P. beaumontensis in strata in western Southland previously mapped as Permian supports earlier evidence from absolute dating and palynology for the Barretts Conglomerate being of Jurassic age.

Keywords  Bivalvia; Pholadomya; new taxa; Kanakimya; Moewakamya; New Zealand; New Caledonia; Murihiku Terrane; Jurassic

New Zealand Journal of Geology and Geophysics, 1995, Vol. 38: 47-59

0028-8306/95/3801-0047 $2.50/0 (c) The Royal Society of New Zealand 1995

PDF file of entire paper: medium quality (3136K); (scanned from paper original: notes about this process)

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