Data/hora: 16/06/2024 02:59:07

Provedor de dados: | 74
País: | Brazil
Título: | Phylogenetic analysis of 16S mitochondrial DNA data in sloths and anteaters
Autores: | Barros,Maria Claudene; Sampaio,Iracilda; Schneider,Horacio.
Data: | 2003-01-01
Ano: | 2003
Palavras-chave: | Pilosa; Sloths; Anteaters; Phylogeny; Mitochondrial DNA; RDNA16S.
Resumo: | We sequenced part of the 16S rRNA mitochondrial gene in 17 extant taxa of Pilosa (sloths and anteaters) and used these sequences along with GenBank sequences of both extant and extinct sloths to perform phylogenetic analysis based on parsimony, maximum-likelihood and Bayesian methods. By increasing the taxa density for anteaters and sloths we were able to clarify some points of the Pilosa phylogenetic tree. Our mitochondrial 16S results show Bradypodidae as a monophyletic and robustly supported clade in all the analysis. However, the Pleistocene fossil Mylodon darwinii does not group significantly to either Bradypodidae or Megalonychidae which indicates that trichotomy best represents the relationship between the families Mylodontidae, Bradypodidae and Megalonychidae. Divergence times also allowed us to discuss the taxonomic status of Cyclopes and the three species of three-toed sloths, Bradypus tridactylus, Bradypus variegatus and Bradypus torquatus. In the Bradypodidae the split between Bradypus torquatus and the proto-Bradypus tridactylus / B. variegatus was estimated as about 7.7 million years ago (MYA), while in the Myrmecophagidae the first offshoot was Cyclopes at about 31.8 MYA followed by the split between Myrmecophaga and Tamandua at 12.9 MYA. We estimate the split between sloths and anteaters to have occurred at about 37 MYA.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572003000100002
Editor: | Sociedade Brasileira de Genética
Relação: | 10.1590/S1415-47572003000100002
Formato: | text/html
Fonte: | Genetics and Molecular Biology  v.26 n.1 2003
Fonte: | info:eu-repo/semantics/openAccess