IANIGLA   20881
INSTITUTO ARGENTINO DE NIVOLOGIA, GLACIOLOGIA Y CIENCIAS AMBIENTALES
Unidad Ejecutora - UE
artículos
Título:
EARLY ORTHOCERATOID CEPHALOPODS FROM THE ARGENTINE PRECORDILLERA
Autor/es:
BJÖRN KRÖGER,; MATILDE S. BERESI; ED LANDING
Revista:
JOURNAL OF PALEONTOLOGY
Editorial:
The Paleontological Society
Referencias:
Lugar: IOWA; Año: 2007 vol. 81 p. 1266 - 1266
ISSN:
0022-3360
Resumen:
ABSTRACT—The Early and Middle Ordovician Orthocerida and Lituitida of Precordilleran Argentina are described, and their systematics and paleogeographic significance are revised. These cephalopods show a strong affinity to coeval faunas of North China, suggesting a location of the Precordillera at middle latitudes in the Southern Hemisphere east of the North China block and relatively close to the Gondwanan margin during the early Middle Ordovician. The descriptive terminology of characters of the septal necks, the position and shape of the siphuncule, and the shape of the connecting ring is improved. The distribution of these characters supports an emendation of the Baltoceratidae, Sactorthoceratidae, and Proteoceratidae. Braulioceras n. gen. (Sactorthoceratidae) and Palorthoceras n. gen. (Orthoceratidae) are erected. The new species Braulioceras sanjuanense, Eosomichelinoceras baldisii, Gangshanoceras villicumense, and Rhynchorthoceras minor are proposed. Palorthoceras  n. gen. from the Lower Ordovician Oepikodus evae Zone represents the earliest known orthocerid.