The complete mitochondrial genome of an agamid lizard from the Afro-Asian subfamily agaminae and the phylogenetic position of Bufoniceps and Xenagama.

Museum of Vertebrate Zoology, 3101 Valley Life Science Building, University of California, Berkeley, CA 94720, USA.
Molecular Phylogenetics and Evolution (Impact Factor: 4.07). 07/2006; 39(3):881-6. DOI: 10.1016/j.ympev.2005.08.020
Source: PubMed
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    ABSTRACT: Mammals dominate modern terrestrial herbivore ecosystems, whereas extant herbivorous reptiles are limited in diversity and body size. The evolution of reptile herbivory and its relationship to mammalian diversification is poorly understood with respect to climate and the roles of predation pressure and competition for food resources. Here, we describe a giant fossil acrodontan lizard recovered with a diverse mammal assemblage from the late middle Eocene Pondaung Formation of Myanmar, which provides a historical test of factors controlling body size in herbivorous squamates. We infer a predominately herbivorous feeding ecology for the new acrodontan based on dental anatomy, phylogenetic relationships and body size. Ranking body masses for Pondaung Formation vertebrates indicates that the lizard occupied a size niche among the larger herbivores and was larger than most carnivorous mammals. Paleotemperature estimates of Pondaung Formation environments based on the body size of the new lizard are approximately 2-5°C higher than modern. These results indicate that competitive exclusion and predation by mammals did not restrict body size evolution in these herbivorous squamates, and elevated temperatures relative to modern climates during the Paleogene greenhouse may have resulted in the evolution of gigantism through elevated poikilothermic metabolic rates and in response to increases in floral productivity.
    Proceedings of the Royal Society B: Biological Sciences 01/2013; 280(1763):20130665. · 5.68 Impact Factor
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    ABSTRACT: Abstract The complete mitogenome sequence of a mystical lizard species Phrynocephalus mystaceus was determined using polymerase chain reaction and directly sequenced with a primer walking method. The complete mitogenome was 16,660 bp in length, containing 13 protein-coding genes, 22 tRNA genes, two rRNA genes and a control region (D-loop). The gene arrangement and composition of P. mystaceus was similar to most other vertebrates, but the Proline tRNA gene was translocated to be adjacent to tRNA-Phe gene. The D-loop consisted of two parts, with part I existing between the tRNA-Thr gene and tRNA-Pro gene and another part inserting between the tRNA-Phe and 12S rRNA. In part I, one conserved sequence (CSB I) could be identified. In part II, two pair of motifs, "TACAT" and its reverted and complemented sequence "ATGTA", could be found in the domain of an extended termination-associated sequence. The mitogenome sequence of P. mystaceus could contribute to a better solution of its phylogenetic position within toad-headed agamids based on the whole mitogenomic data.
    Mitochondrial DNA 03/2013; · 1.71 Impact Factor
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    ABSTRACT: The complete mitochondrial genome of the Yarkand toad-headed agama Phrynocephalus axillaris, the first complete mitogenome from the genus Phrynocephalus, was determined. The total length of this complete mitogenome is 17,937 bp, containing 13 protein-coding genes, 2 rRNA genes, 22 tRNA genes and 2 control regions (CRs). The overall base composition of the H-strand is 36.4% A, 26.0% T, 25.4% C, and 12.3% G. The gene arrangement and composition of the mitogenome are similar to those of other Agaminae lizards, albeit with one CR existing between the tRNA ( Thr ) gene and tRNA ( Pro ) gene and another CR containing 17 copies of 77-bp tandem repeats inserting between the tRNA ( Phe ) and 12S rRNA. The complete mitogenome sequence of P. axillaris provided fundamental data for resolving phylogenetic and genetic problems related to this species and genus Phrynocephalus.
    Mitochondrial DNA 01/2013; · 1.71 Impact Factor

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