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El registro más antiguo de Chasicotatus ameghinoi Scillato-Yané, 1977 (Xenarthra, Dasypodidae) en el Tortoniano medio de La Quebrada de Amaicha (Tucumán, Argentina): consideraciones bioestratigráficas

2017; Volume: 20; Issue: 1 Linguagem: Inglês

10.4072/rbp.2017.1.09

2236-1715

Claudia M. Herrera, Graciela Irene Esteban,

Morphological variations and asymmetry

BIOSTRATIGRAPHIC CONSIDERATIONS.The aim of this work is to present the oldest record of the genus Chasicotatus in northwest Argentina and the first record of a mammal, in fluvio-lakeside sediments of San José Formation (upper Miocene-middle Tortonian).It corresponds to a fragment of the dorsal carapace with articulated movable and fixed osteoderms, which comes from the proximity of the stream La Quenquiada, about 7 km southeast of Amaicha del Valle, Tafí del Valle department, Tucumán province, Argentina.The specimen is assigned to Chasicotatus ameghinoi by the external morphology of the movable and fixed osteoderms.The bearing levels of the San José Formation are correlated with the middle and upper levels of the Arroyo Chasicó Formation, in Buenos Aires Province, and Los Baños Member (lower member) of Chiquimil Formation in the Hualfín-Belen valley, in Catamarca Province.Paleofloristic records allow to infer a warm, seasonal climate and an environment with open forests and savannas.