Abstract
Remains of Alvarezsauridae (Theropoda, Coelurosauria) in the Allen Formation (Campanian- Maastrichthian), in Salitral Ojo de Agua, Rio Negro Province, Argentina. We present new remains from the Cam- panian-Maastrichtian beds of the Allen Formation, in Salitral Ojo de Agua (Rio Negro, Argentina), which are assignable to Alvarezsauridae indet. This clade of small coelurosaurian theropods is known from strata of similar age in Mongolia, and from older sediments (Turonian and Coniacian in age) in Argentina. Thus, the material presented here extends the temporal record of the alvarezsaurids from the Southern Hemisphere up to the Latest Cretaceous. The fossil bones reported were associated to eggshells of the oofamily Elongatoolithidae, which are actually attributed to Theropoda.
Highlights
We present new remains from the Campanian-Maastrichtian beds of the Allen Formation, in Salitral Ojo de Agua (Río Negro, Argentina), which are assignable to Alvarezsauridae indet
This clade of small coelurosaurian theropods is known from strata of similar age in Mongolia, and from older sediments (Turonian and Coniacian in age) in Argentina
The fossil bones reported were associated to eggshells of the oofamily Elongatoolithidae, which are attributed to Theropoda
Summary
Las rocas pertenecientes a unidades campaniano-maastrichtianas expuestas en el norte de la Patagonia Argentina son prolíficas en restos fósiles de tetrápodos continentales (Casamiquela, 1964; Bonaparte et al, 1984; Albino, 1986; Bonaparte, 1987; Powell, 1992; Salgado y Coria, 1996; Salgado y Azpilicueta, 2000; de la Fuente et al, 2001; Martinelli y Forasiepi, 2004; Coria, 2001; Coria y Salgado, 2005; Coria et al, 2007; Salgado et al, 2007a, b). El conocimiento que aportan estos restos ayuda a una mejor comprensión de la evolución de los linajes de dinosaurios carnívoros cretácicos de la Patagonia, como así también extiende significativamente el registro temporal sudamericano de los alvarezsáuridos, considerados como el taxón hermano de las aves (Chiappe et al, 2002), o como un clado de Maniraptoriformes basales (Norell et al, 2001; Novas y Pol, 2002; Clark et al, 2002; Hwang et al, 2002; Makovicky et al, 2005; Göhlich y Chiappe, 2006). Acrónimos Institucionales: LACM: Los Angeles County Museum of Natural History, Los Angeles, California, Estados Unidos; MCF-PVPH: Museo ‘Carmen Funes’, Plaza Huincul, Neuquén, Argentina, Paleontología de Vertebrados; MGPIFD-GR: Museo de Geología y Paleontología, Instituto de Formación Docente Continua de General Roca, Río Negro, Argentina
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