New lower jaw and teeth referred to Maxakalisaurus topai (Titanosauria: Aeolosaurini) and their implications for the phylogeny of titanosaurid sauropods

Autor(es)

Franca, Marco A. G. ^[1] ; Marsola, Julio C. de A. ^[2] ; Riff, Douglas ^[3] ; Hsiou, Annie S. ^[2] ; Langer, Max C. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Fed Vale Sao Francisco Petr, Colegiado Ciencias Biol, Lab Paleontol & Evolucao Petr, Sao Francisco, PE - Brazil

^[2] Univ Sao Paulo, FFCLRP, Lab Paleontol Ribeirao Preto, BR-14049 Ribeirao Preto, SP - Brazil

^[3] Univ Fed Uberlandia, Inst Biol, Lab Paleontol, Av Engenheiro Dinz 1178, CP 593, BR-38400 Uberlandia, MG - Brazil

• Tipo de documento: Artigo Científico
• Fonte: PeerJ; v. 4, JUN 8 2016.
• Citações Web of Science: 3

Resumo

Sauropod dinosaurs compose a diversified, well known, and worldwide distributed clade, with a stereotyped body plan: deep trunk, elongated neck and tail, columnar limbs and very small skull. In Brazil, the group is represented by ten formally described Cretaceous species, mostly titanosaurs. This is the case of Maxakalisaurus topai, known based on an incomplete and disarticulated skeleton, unearthed from deposits of the Adamantina Formation in Minas Gerais. Here, we report a partial right dentary, including five isolated teeth, collected from the same site as the type-series of M. topai and tentatively referred to that taxon. The bone is gently curved medially, the functional teeth are set on an anterolingual position, and two replacement teeth are seen per alveoli. New morphological data gathered from that specimen was employed to conduct a comprehensive phylogenetic analysis of Titanosauria (with 42 taxa and 253 characters), based on previous studies. The Aeolosaurini clade was recovered, with Gondwanatitan and Aelosaurus as sister taxa, and Maxakalisaurus, Panamericansaurus, and Rinconsaurus forming a basal polytomy. (AU)

• Processo FAPESP: 13/23114-1 - Revisão dos Sauropodomorpha (Dinosauria) do Carniano (Neotriássico) com a descrição de novos materiais de Saturnalia tupiniquim
• Beneficiário: Júlio Cesar de Almeida Marsola
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 11/14080-0 - Os Squamata (Reptilia, Lepidosauria) do Cretáceo e Terciário (Paleogeno/Neogeno) das bacias Bauru, Aiuruoca e Acre: sistemática, evolução e paleoambientes
• Beneficiário: Annie Schmaltz Hsiou
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 14/03825-3 - A origem e irradiação dos dinossauros no Gondwana (Neotriássico - Eojurássico)
• Beneficiário: Max Cardoso Langer
• Modalidade de apoio: Auxílio à Pesquisa - Temático