Ucumariidae new family (Bivalvia, Anomalodesmata) and other bivalves from the Early Ordovician (Tremadocian) of northwestern Argentina

SANCHEZ, T.M.; VACCARI, N. E.

AMEGHINIANA

ASOCIACION PALEONTOLOGICA ARGENTINA

Lugar: Buenos Aires; Año: 2003 vol. 40 p. 415 - 424

0002-7014

A new Tremadocian bivalve fauna is described from the Floresta Formation at Sierra de Mojotoro, Jujuy Province. The new genus Ucumaris is described and is the basis for a new family of Anomalodesmata, the Ucumariidae, extending the record of the anomalodesmatans back to the Tremadocian. Intihuarella simplicidentata nov. gen. et sp. included in a new family of Actinodontoida, the Intihuarellidae nov. and an undetermined Redoniidae?, are also described. Additionally, several specimens of Goniophorina (Cosmogoniophorina) cf. tenuicostata Harrington are described and illustrated. These taxa indicate a significant diversification of bivalves in Gondwanan shelves at the beginning of the early Ordovician.