An armadillo-like sphagesaurid crocodyliform from the Late Cretaceous of Brazil |
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| Authors: | Thiago S Marinho Ismar S Carvalho |
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| Institution: | 1. CONICET-Sección Paleontología de Vertebrados, Museo Argentino de Ciencias Naturales ‘Bernardino Rivadavia’, Av. Ángel Gallardo 470, Buenos Aires C1405DJR, Argentina;2. Centro de Pesquisas Paleontológicas L. I. Price, Complexo Cultural e Científico Peirópolis (CCCP), Pró-Reitoria de Extensão Universitária (PROEXT), Universidade Federal do Triângulo Mineiro (UFTM), BR-262, Km 784, Bairro Peirópolis, 38039-755 Uberaba, Minas Gerais, Brazil;3. Departamento de Geologia e Recursos Naturais, Instituto de Geociências, Universidade Estadual de Campinas, 13083-870 Campinas, São Paulo, Brazil;4. CONICET-Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja (CRILAR), Provincia de La Rioja, UNLAR, SEGEMAR, UNCa, CONICET, Entre Ríos y Mendoza s/n, 5301 Anillaco, La Rioja, Argentina;5. Departamento de Geologia, Universidade Federal de Minas Gerais, Belo Horizonte 31270-901, Minas Gerais, Brazil;6. Departamento de Geologia, Escola de Minas, Universidade Federal de Ouro Preto, Campus Morro do Cruzeiro, 35400000 Ouro Preto, Minas Gerais, Brazil;7. Fundação Cultural de Uberaba, Prefeitura Municipal de Uberaba, Praça Rui Barbosa, 356, Centro, CEP. 38010-240 Uberaba, Minas Gerais, Brazil;8. Instituto de Ciências Exatas, Naturais e Educação, Universidade Federal do Triângulo Mineiro, Departamento de Ciências Biológicas, Avenida Doutor Randolfo Borges Júnior, 38064-200 Uberaba, Minas Gerais, Brazil |
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| Abstract: | The Sphagesauridae is a family of Crocodyliformes exclusively known for the Brazilian Late Cretaceous Bauru Basin. This lineage reveals how diverse was the morphology and ecology of terrestrial Crocodyliformes during the Late Cretaceous of Gondwana. Here is described Armadillosuchus arrudai gen. et sp. nov., a sphagesaurid that presents some mammal-like morphological features, such as propalinal and alternate unilateral jaw occlusion pattern and heavy body armor, composed of a rigid shield and mobile-banded section as in extant armadillos (Xenarthra, Dasypodidae). These unusual morphological features contrast to the double row of osteoderms observed on the closest relatives of A. arrudai. As its mammal analogs, A. arrudai presents some evidence of fossoriality and an exclusive terrestrial life style in contrast to the extant alligatorids and crocodylids. |
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