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New cladotherian mammal from southern Chile and the evolution of mesungulatid meridiolestidans at the dusk of the Mesozoic era.
Martinelli, Agustín G; Soto-Acuña, Sergio; Goin, Francisco J; Kaluza, Jonatan; Bostelmann, J Enrique; Fonseca, Pedro H M; Reguero, Marcelo A; Leppe, Marcelo; Vargas, Alexander O.
Afiliação
  • Martinelli AG; CONICET-Sección Paleontología de Vertebrados, Museo Argentino de Ciencias Naturales "Bernardino Rivadavia", Av. Ángel Gallardo 470, C1405DJR, CABA, Argentina. agustin_martinelli@yahoo.com.ar.
  • Soto-Acuña S; Red Paleontológica U-Chile, Laboratorio de Ontogenia y Filogenia, Departamento de Biología, Facultad de Ciencias, Universidad de Chile, Las Palmeras 3425, 7750000, Ñuñoa, Santiago, Chile. agustin_martinelli@yahoo.com.ar.
  • Goin FJ; Red Paleontológica U-Chile, Laboratorio de Ontogenia y Filogenia, Departamento de Biología, Facultad de Ciencias, Universidad de Chile, Las Palmeras 3425, 7750000, Ñuñoa, Santiago, Chile. sesotacu@ug.uchile.cl.
  • Kaluza J; KayTreng Consultores SpA, José Domingo Cañas 1640, Apt. 1502, 7750000, Ñuñoa, Santiago, Chile. sesotacu@ug.uchile.cl.
  • Bostelmann JE; CONICET-División Paleontología Vertebrados, Museo de La Plata, Paseo del Bosque s/n, B1900FWA, La Plata, Argentina.
  • Fonseca PHM; Red Paleontológica U-Chile, Laboratorio de Ontogenia y Filogenia, Departamento de Biología, Facultad de Ciencias, Universidad de Chile, Las Palmeras 3425, 7750000, Ñuñoa, Santiago, Chile.
  • Reguero MA; Fundación de Historia Natural Félix de Azara, Universidad Maimónides, Hidalgo 775, C1405BCK, CABA, Argentina.
  • Leppe M; Instituto de Ciencias de la Tierra, Facultad de Ciencias, Universidad Austral de Chile, Los Laureles s/n, 5090000, Valdivia, Chile.
  • Vargas AO; Programa de Doctorado en Ciencias Mención Ecología y Evolución, Universidad Austral de Chile, Los Laureles s/n, 5090000, Valdivia, Chile.
Sci Rep ; 11(1): 7594, 2021 04 07.
Article em En | MEDLINE | ID: mdl-33828193
In the last decades, several discoveries have uncovered the complexity of mammalian evolution during the Mesozoic Era, including important Gondwanan lineages: the australosphenidans, gondwanatherians, and meridiolestidans (Dryolestoidea). Most often, their presence and diversity is documented by isolated teeth and jaws. Here, we describe a new meridiolestidan mammal, Orretherium tzen gen. et sp. nov., from the Late Cretaceous of southern Chile, based on a partial jaw with five cheek teeth in locis and an isolated upper premolar. Phylogenetic analysis places Orretherium as the earliest divergence within Mesungulatidae, before other forms such as the Late Cretaceous Mesungulatum and Coloniatherium, and the early Paleocene Peligrotherium. The in loco tooth sequence (last two premolars and three molars) is the first recovered for a Cretaceous taxon in this family and suggests that reconstructed tooth sequences for other Mesozoic mesungulatids may include more than one species. Tooth eruption and replacement show that molar eruption in mesungulatids is heterochronically delayed with regard to basal dryolestoids, with therian-like simultaneous eruption of the last premolar and last molar. Meridiolestidans seem endemic to Patagonia, but given their diversity and abundance, and the similarity of vertebrate faunas in other regions of Gondwana, they may yet be discovered in other continents.
Assuntos

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Dente / Arcada Osseodentária / Mamíferos País/Região como assunto: America do sul / Chile Idioma: En Ano de publicação: 2021 Tipo de documento: Article País de afiliação: Argentina

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Dente / Arcada Osseodentária / Mamíferos País/Região como assunto: America do sul / Chile Idioma: En Ano de publicação: 2021 Tipo de documento: Article País de afiliação: Argentina