Kaikaifilu hervei gen. et sp. nov., a new large mosasaur (Squamata,Mosasauridae) from the upper Maastrichtian of Antarctica |
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| Affiliation: | 1. Laboratorio de Ontogenia y Filogenia, Departamento de Biología, Facultad de Ciencias, Universidad de Chile, Las Palmeras 3425, Santiago, Chile;2. Área Paleontología, Museo Nacional de Historia Natural, Casilla 787, Santiago, Chile;3. Comisión de Patrimonio Natural, Consejo de Monumentos Nacionales, Vicuña Mackenna 84, Santiago, Chile;1. The Geology Museum, 1215 W. Dayton St., Madison, WI 53706, USA;2. Paleontological Institute, Russian Academy of Sciences, Profsoyuznaya ul. 123, Moscow 117997, Russia;1. CONICET, Argentina;2. Área Laboratorio e Investigación, Museo Municipal “Ernesto Bachmann”, Villa El Chocón, Neuquén, Argentina;3. Área de Paleontología, Fundación de Historia Natural Félix de Azara, CEBBAD, Universidad Maimónides, Hidalgo 775, 1405 Ciudad Autónoma de Buenos Aires, Argentina;4. Área de Zoología, Universidad Nacional de San Luis, Chacabuco 917, 5700 San Luis, Argentina;1. CONICET – Área de Zoología, Departamento de Bioquímica y Ciencias Biológicas, Facultad de Química, Bioquímica y Farmacia, Universidad Nacional de San Luis, Chacabuco 917, 5700, San Luis, Argentina;2. CONICET – Fundación de Historia Natural ‘Félix de Azara’, CEBBAD, Universidad Maimónides, Hidalgo 775, 1405, Buenos Aires, Argentina;3. Dipartimento di Scienze della Terra, Università di Pisa, Via S. Maria 53, 56126, Pisa, Italy;4. Fondazione Museo Civico di Rovereto, Borgo Santa Caterina 41, 38068, Rovereto, TN, Italy;5. Secretaría de Cultura de la Provincia de Río Negro, Julio A. Roca 267, 8500, Viedma, Río Negro, Argentina;1. CR2P, UMR 7207 CNRS-MNHN-UPMC, Département Origines et Evolution, Muséum National d''Histoire naturelle, CP 38, 57 rue Cuvier, 75005 Paris, France;2. Grupo de Investigación IberCreta, Departamento de Geología, Geografía y Medio Ambiente, Facultad de Ciencias, Universidad de Alcalá, Alcalá de Henares, 28871 Madrid, Spain;3. Grupo de Biología Evolutiva, Facultad de Ciencias, UNED, Paseo de la Senda del Rey 9, 28040 Madrid, Spain |
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| Abstract: | We present a large, fragmentary skull and the humerus of a mosasaur (Squamata, Mosasauroidea) recovered from upper Maastrichtian beds of the López de Bertodano Formation in Marambio (=Seymour) Island, Antarctica. The material belongs to a large, adult individual with marked heterodonty as well as unusual humeral features. Different phylogenetic analyses returned the studied specimen within the Tylosaurinae, while the distinctive features of the skull and humerus allow distinguish it from the unique Antarctic known tylosaurine species, Taniwhasaurus antarcticus (Novas et al., 2002), as well as from other known Late Cretaceous mosasaurids from the Southern Hemisphere, thus, justifying the erection of a new taxon, Kaikaifilu hervei gen. et. sp. nov. The different dental types documented in the specimen studied have been previously recorded through isolated teeth from the same locality and were subsequently referred to several genera. This new find is relevant for assessing the previously known fragmentary records of Antarctic mosasaurids, suggesting that its local diversity could be more reduced than previously interpreted. The new material represents the youngest occurrence of tylosaurines in Antarctica. |
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| Keywords: | Marine reptiles Mosasaurs Upper Cretaceous Marambio Island Antarctic Peninsula |
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