Tritheledontidae

Tritheledontidae
Intervalo temporal:
Triássico Superior−Jurássico Médio
228–161 Ma
Pachygenelus monus
Classificação científica e
Domínio: Eukaryota
Reino: Animalia
Filo: Chordata
Clado: Synapsida
Clado: Therapsida
Clado: Cynodontia
Clado: Prozostrodontia
Família: †Tritheledontidae
Broom, 1912

Tritheledontidae, por vezes denominada Ictidosauria,[1] foram cinodontes de pequeno e médio porte (cerca de 10 ou 20 cm de comprimento[1]). Constituem um grupo de pequenos cinodontes extremamente derivados, aproximando-se em muito da condição mamaliana, embora ainda mantivessem algumas características anatômicas dos amniotas primitivos. Tritelodontídeos foram principalmente carnívoros ou insetívoros, embora algumas espécies exibissem características relacionadas à omnivoria. Seus esqueletos mostram que eles tinham uma relação próxima com os mamíferos. Triteledontídeos ou algum grupo relacionado originou os mamíferos primitivos. Os triteledontídeos são uma das linhagens de terápsidos não-mamalianos mais duradouras, seu registro fóssil estende-se do final do Triássico até o período Jurássico. Triteledontídeos foram extintos no período Jurássico, possivelmente devido à competição com mamíferos basais, como os triconodontes. Eles são conhecidos a partir de fósseis encontrados no Brasil, Argentina e África do Sul, indicando que viveram somente no supercontinente de Gondwana. A família Tritheledontidae foi definida pelo médico e paleontólogo escocês Robert Broom em 1912.[2]

Gênero

Referências

  1. ↑ a b «Family Trithelodontidae». Consultado em 31 de dezembro de 2008. Cópia arquivada em 17 de abril de 2010 
  2. ↑ Broom, R. (1912). "On a new type of cynodont from the Stormberg". Annals of the South African Museum 7: 334–336. May be downloaded from:[[1]]

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