A new species of Caipirasuchus (Notosuchia, Sphagesauridae) from the Late Cretaceous of Brazil and the evolutionary history of Sphagesauria

Autor(es)

Ruiz, Juan V. ^{[1, 2]} ; Bronzati, Mario ^[3] ; Ferreira, Gabriel S. ^[4] ; Martins, Kawan C. ^{[1, 2]} ; Queiroz, Marcos V. ^{[1, 2]} ; Langer, Max C. ^[4] ; Montefeltro, Felipe C. ^[1]

Afiliação do(s) autor(es)

^[1] UNESP, Fac Engn Ilha Solteira, Lab Paleontol & Evolucao Ilha Solteira, Ilha Solteira, SP - Brazil

^[2] UNESP, Inst Biol Letras & Ciencias Exatas, Programa Posgrad Biol Anim, Sao Jose Do Rio Preto, SP - Brazil

^[3] Univ Sao Paulo, Fac Filosofia Ciencias & Letras Ribeirao Preto, Lab Evolucao & Biol Integrat, Ribeirao Preto, SP - Brazil

^[4] Univ Sao Paulo, Fac Filosofia Ciencias & Letras Ribeirao Preto, Lab Paleontol, Ribeirao Preto, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF SYSTEMATIC PALAEONTOLOGY; v. 19, n. 4, p. 265-287, FEB 16 2021.
• Citações Web of Science: 0

Resumo

Sphagesauridae is a group of notosuchian crocodyliforms from the Late Cretaceous of South America characterized by highly specialized jaws and dentition. Here, we describe a new sphagesaurid from the Santo Anastacio Formation (Caiua Group, Bauru Basin), south-east Brazil. The specimen is composed of a partial palate, neurocranium, mandible and fragmentary teeth. It represents a new species that can be assigned to Caipirasuchus due to the presence of a lateromedially narrow and anteroposteriorly long mandibular symphyseal region, apicobasal ridges on the posterior teeth, a diastema between D5 and D6, and a linear row of large neurovascular foramina on the lateral surface of the dentary. It differs from previously described Caipirasuchus species based on a ventrolaterally inclined surface of the dentaries posterior to the tooth row, a connection between the anteroventral margin of the external mandibular fenestra and the floor of the Meckelian canal, and the anterior process of the angular forming a `V'-shaped suture in its contact with the splenial. The results of a phylogenetic analysis of notosuchians recovered the so-called `advanced notosuchians' in a clade, for which we propose a phylogenetic definition and erect the name Sphagesauria. We also recovered two more inclusive clades encompassing an array of Mesozoic notosuchians, here named Xenodontosuchia, which includes Sphagesauria + Baurusuchia, and Eunotosuchia, including Xenodontosuchia, Uruguaysuchidae and other Cretaceous forms. (AU)

• 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
• Processo FAPESP: 18/18145-9 - Integrando evo-devo e paleontologia no estudo da origem e evolução do ouvido timpânico em diapsida
• Beneficiário: Mario Bronzati Filho
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 19/10620-2 - Macroevolução das tartarugas: contribuições de análises quantitativas, paleontologia virtual e biomecânicas
• Beneficiário: Gabriel de Souza Ferreira
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado