Time filter

Source Type

Guarnizo C.E.,University of Brasilia | Werneck F.P.,National Institute of Amazonian Research | Giugliano L.G.,University of Brasilia | Santos M.G.,University of Mississippi | And 10 more authors.
Molecular Phylogenetics and Evolution | Year: 2016

The Cerrado is a wide Neotropical savanna with tremendously high endemic diversity. Yet, it is not clear what the prevalent processes leading to such diversification are. We used the Cerrado-endemic lizard Norops meridionalis to investigate the main abiotic factors that promoted genetic divergence, the timings of these divergence events, and how these relate to cryptic diversity in the group. We sequenced mitochondrial and nuclear genes from 21 sites of N. meridionalis to generate species tree, divergence time estimations, and estimate species limits. We also performed population-level analysis and estimated distribution models to test the roles of niche conservatism and divergence in the group diversification. We found that N. meridionalis is composed by at least five cryptic species. Divergence time estimations suggest that the deepest branches split back into the early-mid Miocene, when most of the geophysical activity of the Cerrado took place. The deep divergences found in N. meridionalis suggest that beta anoles invaded South America much earlier than previously thought. Recent published evidence supports this view, indicating that the Panama gap closed as early as 15. mya, allowing for an early invasion of Norops into South America. The spatial pattern of diversification within N. meridionalis follows a northwest-southeast direction, which is consistent across several species of vertebrates endemic to the Cerrado. Also, we found evidence for non-stationary isolation by distance, which occurs when genetic differentiation depends on space. Our preliminary data in two out of five lineages suggest that niche conservatism is an important mechanism that promoted geographic fragmentation in the group. © 2015 Elsevier Inc. Source

Colli G.R.,University of Brasilia | Hoogmoed M.S.,Museu Paraense Emilio Goeldi CZO | Cannatella D.C.,University of Texas at Austin | Cassimiro J.,University of Sao Paulo | And 7 more authors.
Zootaxa | Year: 2015

We describe a new genus and two new species of gymnophthalmid lizards based on specimens collected from Brazilian Amazonia, mostly in the "arc of deforestation". The new genus is easily distinguished from other Gymnophthalmidae by having very wide, smooth, and imbricate nuchals, arranged in two longitudinal and 6-10 transverse rows from nape to brachium level, followed by much narrower, strongly keeled, lanceolate, and mucronate scales. It also differs from all other Gymnophthalmidae, except Iphisa, by the presence of two longitudinal rows of ventrals. The new genus differs from Iphisa by having two pairs of enlarged chinshields (one in Iphisa); posterior dorsal scales lanceolate, strongly keeled and not arranged in longitudinal rows (dorsals broad, smooth and forming two longitudinal rows), and lateral scales keeled (smooth). Maximum parsimony, maximum likelihood, and Bayesian phylogenetic analyses based on morphological and molecular data indicate the new species form a clade that is most closely related to Iphisa. We also address several nomenclatural issues and present a revised classification of Gymnophthalmidae. Copyright © 2015 Magnolia Press. Source

Peloso P.L.V.,Museu Paraense Emilio Goeldi CZO | Peloso P.L.V.,Federal University of Para | Avila-Pires T.C.S.,Museu Paraense Emilio Goeldi CZO
Herpetologica | Year: 2010

Intra- and interpopulational variation in the morphology of Ptychoglossus brevifrontalis Boulenger, 1912 were studied. Differences in scale counts and morphometric traits among populations and between sexes are evaluated and described. Sexual dimorphism is evident in number of precloacal and femoral pores, and to a lesser degree in body elongation. Hemipenial morphology is briefly discussed. Ptychoglossus nicefori (Loveridge, 1929) is again considered a junior synonym of P. brevifrontalis. Brief comments on the species taxonomy are provided. © 2010 by The Herpetologists' League, Inc. Source

Hoogmoed M.S.,Museu Paraense Emilio Goeldi CZO | Avila-Pires T.C.S.,Museu Paraense Emilio Goeldi CZO
Zootaxa | Year: 2015

Recently seven specimens of the gecko Lepidodactylus lugubris were collected or observed in Belém, Pará, northern Bra-zil. This is the first vouchered occurrence in Brazil of a widely dispersed (Pacific area) and invasive species (much of the Pacific, parts of northern South America and southern Central America and Florida, U.S.A.). In Suriname the species has already spread into the interior. The distribution of the species is corrected and the history of its introduction in the New World is reconstructed, with an estimation of the state of invasiveness for each country. Some possible routes of introduc-tion are discussed. Copyright © 2015 Magnolia Press. Source

Discover hidden collaborations