A revision of the putative Late Cretaceous triconodonts from South America |
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| Affiliation: | 1. Instituto de Estudios Andinos “Don Pablo Groeber” (UBA – CONICET), Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Intendente Güiraldes 2160, Ciudad Universitaria, Pabellón II, C1428EGA Ciudad Autónoma de Buenos Aires, Argentina;2. Department of Anatomical Sciences and Neurobiology, University of Louisville, 500 S. Preston St., Louisville, KY 40292, USA;1. Institut Català de Paleontologia Miquel Crusafont (ICP), Edifici Z ICTA-ICP, Carrer de les Columnes s/n, Campus de la Universitat Autònoma de Barcelona, Cerdanyola del Vallès, 08193 Barcelona, Spain;2. Unitat d’Antropologia, Departament de Biologia Animal, Biologia Vegetal i Ecologia, Universitat Autònoma de Barcelona, Cerdanyola del Vallès, 08193 Barcelona, Spain;3. ICREA, Passeig Lluís Companys 23, 08010, Barcelona, Spain;1. Center for Functional Anatomy and Evolution, The John Hopkins University, Baltimore, MD 21205, USA;2. Department of Evolutionary Anthropology, Duke University, Durham, NC 27710, USA;3. División Paleontología Vertebrados, Museo de La Plata, Paseo del Bosque, B1900 FWA La Plata, Argentina;4. Consejo Nacional de Investigacione Científicas y Técnicas, Argentina;5. Comisión de Investigaciones Científicas, Argentina;1. INGEOSUR-CONICET, Departamento de Geología Universidad Nacional del Sur, San Juan 670, 8000, Bahía Blanca, Buenos Aires, Argentina;2. Departamento de Geología Universidad Nacional del Sur, San Juan 670, 8000, Bahía Blanca, Buenos Aires, Argentina;3. Facultad de Ciencias Exactas y Naturales, Universidad Nacional de La Pampa, Avenida Uruguay 151, 6300, Santa Rosa, La Pampa, Argentina |
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| Abstract: | Austrotriconodon mckennai and Austrotriconodon sepulvedai, from the Campanian Los Alamitos Formation, Patagonia, Argentina were originally described as triconodont mammals and the sole members of the family Austrotriconodontidae. These mammals were represented by isolated cheek teeth originally regarded as molariforms, but their peculiar morphology later raised doubts about their purported triconodont affinities. Nevertheless, the morphological bases supporting the alternative taxonomic views have not been fully documented. We present here detailed comparisons of Austrotriconodon with other Late Cretaceous taxa and conclude that Austrotriconodon specimens should be assigned to Meridiolestida and Mesungulatoidea. These isolated teeth are likely premolars and might represent unknown dental positions of already described species or correspond to taxa that are yet to be formally recognized. According to our interpretation, there is still no record of Cretaceous triconodonts in South America, but we support the triconodont affinities for Jurassic taxa from the Cañadón Asfalto Formation in central Patagonia. |
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| Keywords: | Triconodonts Meridiolestida Los Alamitos Formation Late Cretaceous South America |
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