Abstract：
:Phylogenetic relationships and divergence times for 10 populations of the three recognized "species" of Brazilian lizards of genus Eurolophosaurus were estimated from 1229bp of cyt b, COI, 12S, and 16S rRNA mitochondrial gene segments. Eurolophosaurus is monophyletic and the basal split within the genus separates E. divaricatus from a clade comprising E. amathites and E. nanuzae. Three populations of E. divaricatus, which occurs along the western bank of Rio São Francisco, were consistently grouped together. On the east bank of the river, E. amathites and E. nanuzae from state of Bahia were recovered as the sister group of E. nanuzae populations from state of Minas Gerais. The paraphyly of E. nanuzae and the high divergence levels among populations of E. divaricatus strongly suggest that species limits in Eurolophosaurus should be revised. Even considering an extreme evolutionary rate of 2.8% sequence divergence per million years for the four gene segments analyzed together, E. divaricatus would have separated from the two other species by at least 5.5my ago, and E. amathites from E. nanuzae populations from Bahia and Minas Gerais, respectively, by 1.5 and 3.5my. The paleolacustrine hypothesis and changes in the course of the river potentially explain faunal divergence in the area, but divergences are much older than previously admitted.
journal_name
Mol Phylogenet Evoljournal_title
Molecular phylogenetics and evolutionauthors
Passoni JC,Benozzati ML,Rodrigues MTdoi
10.1016/j.ympev.2007.10.022subject
Has Abstractpub_date
2008-02-01 00:00:00pages
403-14issue
2eissn
1055-7903issn
1095-9513pii
S1055-7903(07)00381-8journal_volume
46pub_type
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