NEW EARLY ORDOVICIAN LEPTELLINAE (BRACHIOPODA) FROM THE SAN JUAN FORMATION, WEST-CENTRAL ARGENTINA

Juan L. Benedetto, Zarela A. Herrera

Abstract


Brachiopods of the Subfamily Leptollinae are described from the Arenig carbonate rocks of the Precordillera mountain belt, West-Central Argentina. The new monotypic genera Huacoella and Niquivilia are described. The subgenus Leptella (Leptella) is represented in the San Juan Formation by four new species, L. (L.) variabilis, L. (L.) plana, L. (L) alata and L. (L.) costellata and a form related to (L.) alata. The associated brachiopod fauna indicates affinities with the Scoto-Appalachian Province, although the presence of an endemic stock of leptellinids suggests a certain degree of isolation between the Precordillera basin and the carbonate platform of the Laurentian margin during the Arenig.

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