Evolução dos Toxodontia da América do Sul durante o Cenozoico: aspectos dentários, paleoclimáticos e paleoambientais

Autores

  • Patrícia Rodrigues Braunn Universidade Federal do Rio Grande do Sul
  • Ana Maria Ribeiro Universidade Federal do Rio Grande do Sul

DOI:

https://doi.org/10.20396/td.v13i2.8650100

Palavras-chave:

Cenozoico. Mudanças paleoambientais. Mudanças paleoclimáticas. Notoungulata. Paleohistologia dentária.

Resumo

Os notoungulados são ungulados nativos sul-americanos registrados do Paleoceno ao Pleistoceno, e cuja diversidade declinou drasticamente durante o Plioceno, alcançando a América Central e América do Norte durante o Pleistoceno. Notoungulados evoluíram sob influência climática e ambiental, de linhagens arcaicas, com sistema mastigatório generalizado, com dentição completa, sem diastema, com molares e pré-molares braquiodontes, a formas especializadas com incisivos hipertrofiados, padrões oclusais da coroa simplificados e formas proto-hipsodontes e eu-hipsodontes. Estas comunidades viveram primeiramente em hábitats florestais quentes e úmidos, e posteriormente, em pastagens relativamente temperadas de hábitats abertos, com forte tendência à aridização e ao resfriamento ao longo do Cenozoico. Além da evolução da morfologia macroscópica dentária observada em Notoungulata, também é possível evidenciar a evolução dos tipos de microestrutura do esmalte, através da presença de características mais derivadas em formas eu-hipsodontes, indicando adaptação funcional e conferindo maior resistência ao consumo de vegetação mais abrasiva.

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Biografia do Autor

Patrícia Rodrigues Braunn, Universidade Federal do Rio Grande do Sul

Possui graduação em Ciências Biológicas pela Universidade Federal do Rio Grande do Sul (Licenciatura, 1999 e Bacharelado com Ênfase Ambiental, 2000) e, Mestrado em Geociências pela UFRGS (2012). Atualmente é aluna do curso de Doutorado do Programa de Pós-Graduação em Geociências da UFRGS e, Assessora Técnica da Comissão de Ensino Médio e Superior do Conselho Estadual de Educação/RS.

Ana Maria Ribeiro, Universidade Federal do Rio Grande do Sul

Graduação em Ciências Biológicas pela Universidade de Taubaté (1986), mestrado em Geociências pela Universidade Federal do Rio Grande do Sul (1994) e doutorado em Ciências pela Universidade Federal do Rio Grande do Sul (2003). Atualmente é Bióloga/Pesquisadora da Seção de Paleontologia do Museu de Ciências Naturais da Fundação Zoobotânica do Rio Grande do Sul (MCN/FZBRS), coordenadora do Programa Institucional de Bolsas de Iniciação Científica/CNPq no MCN/FZBRS, editora da Revista Brasileira de Paleontologia, docente colaboradora do Programa de Pós-Graduação em Geociências na Universidade Federal do Rio Grande do Sul.

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2017-08-10

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BRAUNN, P. R.; RIBEIRO, A. M. Evolução dos Toxodontia da América do Sul durante o Cenozoico: aspectos dentários, paleoclimáticos e paleoambientais. Terrae Didatica, Campinas, SP, v. 13, n. 2, p. 127–145, 2017. DOI: 10.20396/td.v13i2.8650100. Disponível em: https://periodicos.sbu.unicamp.br/ojs/index.php/td/article/view/8650100. Acesso em: 9 ago. 2022.

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