Palabras clave. Cladosictis patagonica. Formación Collón Cura. Mioceno Medio.Variabilidad intraespecífica SPARASSODONTA (METATHERIA) was the major mammalian predator group in terrestrial ecosystems of South America during most of the Cenozoic. Currently, nearly 60 species are valid. By the late early Miocene (Burdigalian, Santacrucian age), their richness had peaked at eleven species (Prevosti et al., 2012a). Subsequently (Burdigalian-Langhian Friasian and Langhian Colloncuran ages) their richness curve steeply declined; however, this pattern is likely the result of sampling bias (Prevosti & Forasiepi, 2018).One classical middle Miocene vertebrate association occurs in the Collón Cura Formation (CCF), exposed in northwestern Patagonia (Río Negro, Neuquén, and Chubut provinces) (e.g.,
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