Abstract
Abstract Fossil bivalves of the family Pholadomyidae are described from Jurassic sequences of the Murihiku T errane 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. teaumontensis 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.
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