ON THE PRESENCE OF THE CYCAD PSEUDOCTENIS DENTATA ARCHANGELSKY AND BALDONI IN THE PUNTA DEL BARCO FO RMATION (LATE APTIAN), SANTA CRUZ PROVINCE, ARGENTINA
Keywords:
Análisis de cutícula foliar, Pseudoctenis, Cycadales, Grupo Baqueró, Aptiano, CretácicoAbstract
In southern South America more than twenty species, referred to the cycad genus Pseudoctenis, have been recorded from Upper Triassic to Lower Cretaceous deposits. However only three, identified from the Baqueró Group (Aptian), have cuticle preserved. One of them, Pseudoctenis dentata Archangelsky and Baldoni, from the Anfiteatro de Ticó Formation (basal unit of the Baqueró Group) is here identified on the basis of well-preserved material collected in the same Group, but in its upper unit (Punta del Barco Formation). This record extends the presence of this taxon in the Cretaceous flora of Patagonia and reinforces the importance of the cuticular features in paleotaxonomical assignations. En el sur de América del Sur más de veinte especies de Pseudoctenis (Cycadales) han sido registradas en depósitos comprendidos entre el Triásico Superior y el Cretácico Inferior. Sin embargo, sólo tres especies, pertenecientes al Grupo Baqueró (Aptiano), conservan restos de cutícula. Uno de ellos, Pseudoctenis dentata Archangelsky y Baldoni, de la Formación Anfiteatro de Ticó (unidad inferior del Grupo Baqueró) se identifica aquí sobre la base de un nuevo espécimen bien conservado obtenido en depósitos del mismo grupo, pero en su unidad superior (Formación Punta del Barco). Este registro extiende la presencia de P. dentata en el Cretácico de Patagonia, a la vez que refuerza la importancia de considerar las características cuticulares en las asignaciones paleotaxonómicas.Downloads
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