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
0 0
  • Source
    [show abstract] [hide abstract]
    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
  • Source
    [show abstract] [hide abstract]
    ABSTRACT: Acrodonta consists of Agamidae and Chamaeleonidae that have the characteristic acrodont dentition. These two families and Iguanidae sensu lato are members of infraorder Iguania. Phylogenetic relationships and historical biogeography of iguanian lizards still remain to be elucidated in spite of a number of morphological and molecular studies. This issue was addressed by sequencing complete mitochondrial genomes from 10 species that represent major lineages of acrodont lizards. This study also provided a good opportunity to compare molecular evolutionary modes of mitogenomes among different iguanian lineages. Acrodontan mitogenomes were found to be less conservative than iguanid counterparts with respect to gene arrangement features and rates of sequence evolution. Phylogenetic relationships were constructed with the mitogenomic sequence data and timing of gene rearrangements was inferred on it. The result suggested highly lineage-specific occurrence of several gene rearrangements, except for the translocation of the tRNAPro gene from the 5' to 3' side of the control region, which likely occurred independently in both agamine and chamaeleonid lineages. Phylogenetic analyses strongly suggested the monophyly of Agamidae in relation to Chamaeleonidae and the non-monophyly of traditional genus Chamaeleo within Chamaeleonidae. Uromastyx and Brookesia were suggested to be the earliest shoot-off of Agamidae and Chamaeleonidae, respectively. Together with the results of relaxed-clock dating analyses, our molecular phylogeny was used to infer the origin of Acrodonta and historical biogeography of its descendant lineages. Our molecular data favored Gondwanan origin of Acrodonta, vicariant divergence of Agamidae and Chamaeleonidae in the drifting India-Madagascar landmass, and migration of the Agamidae to Eurasia with the Indian subcontinent, although Laurasian origin of Acrodonta was not strictly ruled out. We detected distinct modes of mitogenomic evolution among iguanian families. Agamidae was highlighted in including a number of lineage-specific mitochondrial gene rearrangements. The mitogenomic data provided a certain level of resolution in reconstructing acrodontan phylogeny, although there still remain ambiguous relationships. Our biogeographic implications shed a light on the previous hypothesis of Gondwanan origin of Acrodonta by adding some new evidence and concreteness.
    BMC Evolutionary Biology 01/2010; 10:141. · 3.29 Impact Factor
  • [show abstract] [hide abstract]
    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

Full-text (2 Sources)

Available from
Jan 25, 2014