Topic
Polychrus
About: Polychrus is a research topic. Over the lifetime, 16 publications have been published within this topic receiving 396 citations.
Papers
TL;DR: The Polychrotidae is found not to be monophyletic, containing instead the Corytophanidae as the sister taxon of Anolis plus Polychrus, and the Iguania is reformulated.
Abstract: Using the techniques of direct optimization and sensitivity analysis, the phylogenetics of polychrotid lizards were examined on the basis of both molecular and morphological data (ca. 1040 bp of 12S rDNA, valine tDNA, and 16S rDNA, and 82 characters of morphology). A sensitivity analysis of sequence alignment and morphological change cost functions demonstrated that equal weighting provided the most parsimonious solution for all data. The Polychrotidae is found not to be monophyletic, containing instead the Corytophanidae as the sister taxon of Anolis plus Polychrus Based on these and other results over the last 12 years, the taxonomy of the Iguania is reformulated, with the Iguania composed of two subsidiary taxa, Acrodonta and Pleurodonta, the Acrodonta containing the likely paraphyletic and basally unresolved “Agamidae” as well as the Chamaeleonidae, and the Pleurodonta containing the Corytophanidae, Crotaphytidae, Hoplocercidae, Iguanidae, Leiocephalidae (newly elevated from its former status...
191 citations
TL;DR: A new colorful species of Polychrus with a conspicuous sexual dimorphism from the dry forest of the northern portion of Región de La Libertad, Peru, which has very small dorsal scales and thus a higher number of scales around midbody and in the middorsal line.
Abstract: We herein describe a new colorful species of Polychrus with a conspicuous sexual dimorphism from the dry forest of the northern portion of Region de La Libertad, Peru. The new species differs from all other Polychrus species, in that this species has very small dorsal scales and thus a higher number of scales around midbody and in the middorsal line from behind the occipital scales to the level of the posterior edge of the thigh. Furthermore, we redescribe Polychrus peruvianus whose original description is short and lacks information on intraspecific variation and sexual dimorphism. Also, we add some information on intraspecific variation and ecology of Polychrus gutturosus. Finally, we synonymize Polychrus spurrelli Boulenger with Polychrus gutturosus.
25 citations
TL;DR: Karyotypes of Polychrus acutirostris and P. marmoratus after differentialstaining are reported for the first time, revealing that Polych Rus has uncommon karyotypes when compared to other non-acrodont Iguania, and considerable variability at interspecific level.
Abstract: Karyotypes of Polychrus acutirostris and P. marmoratus after differentialstaining are reported for the first time. P. acutirostris presents 2n=20 (females) and 2n=19 (males). The differential diplo...
24 citations
TL;DR: The sex determining mechanism of the Brazilian lizard Polychrus sp was interpreted as belonging to the « pseudo XO/XX » type, which differs from the X1X2Y/X1X1 X2X2 type because the Y is morphologically indistinguishable from theX2 chromosome.
Abstract: SUMMARYThe karyotype of the Brazilian lizard Polychrus sp showed 2n=20 chromosomes for the female and 2n=19 chromosomes for the male. The meiotic cells of the male in diakinesis and metaphase I showed 8 bivalents and 1 trivalent. In metaphase II there were cells with n=9 chromosomes, and cells with n = 10 chromosomes. The sex determining mechanism was interpreted as belonging to the « pseudo XO/XX » type, which differs from the X1X2Y/X1X1X2X2 type because the Y is morphologically indistinguishable from the X2 chromosome. This is the second occurrence of this case to be described in the vertebrates.
14 citations
TL;DR: Polychrus acutirostris demonstrated low richness of nematode parasites, but high levels of infection with G. bahiensis, reported here as a new host for P. retusa.
Abstract: We present data on nematode infracommunity of the arboreal lizard Polycrhus acutirostris in the semiarid Caatinga biome, northeastern Brazil. Twenty- twolizard specimens collected in the municipality of Varzea Alegre in Ceara State and in the municipality of Exu in Pernambuco State were analyzed. Two species of nematodes were found, an Oxyuridae, Gynaecometra bahiensis, which had amean intensity of infection 23.5 ± 5.8 (prevalence 22%) and a Physalopteridae, Physaloptera retusa which had infection intensity of 21 (prevalence 9%). There were no significant differences between the parasitism rates of male or female lizards. Polychrus acutirostris demonstrated low richness of nematode parasites, but high levels of infection with G. bahiensis. Polychrus acutirostrisis reported here as a new host for P.retusa.
14 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2021 | 1 |
| 2019 | 1 |
| 2017 | 1 |
| 2015 | 1 |
| 2014 | 2 |
| 2011 | 3 |