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The Cretaceous actinistian Mawsonia is represented by more than 360 dissociated, but well-preserved, bones obtained from the Areado Group in the Sanfranciscana Basin of Minas Gerais, Brazil. These are among the oldest records of Mawsonia (Berriasian, Lower Neocomian) and include previously undescribed or poorly known skeletal elements (e.g. splenial, dentary, autopalatine, zygals). The new material is referred to the type species, M. gigas. Morphological variation in the sample blurs some of the distinctions formerly drawn between nominal species of Mawsonia, and species level diversity in the genus is difficult to establish. Mawsonia ubangiensis, M. libyca,...

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