The karyotype of Amphisbaena ridleyi, an endemic species of the archipelago of Fernando de Noronh... more The karyotype of Amphisbaena ridleyi, an endemic species of the archipelago of Fernando de Noronha, in State of Pernambuco, Brazil, is described after conventional staining, Ag-NOR impregnation and fluorescence in situ hybridization (FISH) with a telomeric probe. The diploid number is 46, with nine pairs of macrochromosomes (three metacentrics, four subtelocentrics and two acrocentrics) and 14 pairs of microchromosomes. The Ag-NOR is located in the telomeric region of the long arm of metacentric chromosome 2 and FISH revealed signals only in the telomeric region of all chromosomes. Further cytogenetic data on other amphisbaenians as well as a robust phylogenetic hypothesis of this clade is needed in order to understand the evolutionary changes on amphisbaenian karyotypes.
Amphisbaenians are fossorial squamate reptiles distributed mainly in South America and Africa. Br... more Amphisbaenians are fossorial squamate reptiles distributed mainly in South America and Africa. Brazilian worm lizards belong to the family Amphisbaenidae, which has far more recognized species than any of the other five amphisbaenian families. Morphological datasets recovered Amphisbaenidae as paraphyletic, while previous molecular phylogenetic studies did not include enough taxa to solve the generic-level relationships within this family. We present a molecular phylogenetic hypothesis based on a sample of 58 amphisbaenians, including representatives of six of the seven South American genera. Our molecular data include sequences from two mitochondrial genes (16S, ND2; 1,184 characters) and three nuclear genes (RAG-1, C-MOS, BDNF; 1,898 characters). Our phylogenetic hypothesis is not fully resolved, although it does not support the monophyly of most genera except Leposternon. Morphological characters currently used to diagnose genera of South American amphisbaenians are homoplastic, and the taxonomy based on them is not appropriate. We revise the taxonomy of this group and sink several South American genera of Amphisbaenidae (Cercolophia, Bronia, Aulura, Anops and Leposternon) into Amphisbaena.
A Biota Neotropica é uma revista eletrônica e está integral e gratuitamente disponível no endereç... more A Biota Neotropica é uma revista eletrônica e está integral e gratuitamente disponível no endereço http://www.biotaneotropica.org.br Biota Neotropica is an electronic, peer-reviewed journal edited by the Program BIOTA/FAPESP: The Virtual Institute of Biodiversity. This journal's aim is to disseminate the results of original research work, associated or not to the program, concerned with characterization, conservation and sustainable use of biodiversity within the Neotropical region.
A Biota Neotropica é uma revista eletrônica e está integral e gratuitamente disponível no endereç... more A Biota Neotropica é uma revista eletrônica e está integral e gratuitamente disponível no endereço http://www.biotaneotropica.org.br Biota Neotropica is an electronic, peer-reviewed journal edited by the Program BIOTA/FAPESP: The Virtual Institute of Biodiversity. This journal's aim is to disseminate the results of original research work, associated or not to the program, concerned with characterization, conservation and sustainable use of biodiversity within the Neotropical region. Biota Neotropica é uma revista do Programa BIOTA/FAPESP -O Instituto Virtual da Biodiversidade, que publica resultados de pesquisa original, vinculada ou não ao programa, que abordem a temática caracterização, conservação e uso sustentável da biodiversidade na região Neotropical. Serra Geral do Tocantins, Jalapão region, Tocantins and Bahia States. Biota neotrop. 11(1): http://www. biotaneotropica.org.br/v11n1/en/abstract?article+bn03511012011.
The genus Odontophrynus consists of 11 species of medium-sized frogs distributed across south and... more The genus Odontophrynus consists of 11 species of medium-sized frogs distributed across south and east South America. This study examines and describes the chondrocrania and oral cavities of O. americanus, O. maisuma, O. carvalhoi, and O. cultripes, and review current knowledge about the larval external morphology of the genus. Twenty-one tadpoles were cleared and double-stained for chondrocranium description and five tadpoles were dissected for analysis in a scanning electron microscope. The presence of a tectum parientale may be considered here as a putative synapomorphy of the genus. The O. americanus and O. cultripes species groups were partially differentiated by the length of the processus pseudopterigoideus, shape of divergence of the hypobranchial plates, number of postnarial papillae, and number of projections of the lateral ridge papillae. The larvae of O. occidentalis species group, in turn, differed from others by presenting a greater total length.
The karyotype of Amphisbaena ridleyi, an endemic species of the archipelago of Fernando de Noronh... more The karyotype of Amphisbaena ridleyi, an endemic species of the archipelago of Fernando de Noronha, in State of Pernambuco, Brazil, is described after conventional staining, Ag-NOR impregnation and fluorescence in situ hybridization (FISH) with a telomeric probe. The diploid number is 46, with nine pairs of macrochromosomes (three metacentrics, four subtelocentrics and two acrocentrics) and 14 pairs of microchromosomes. The Ag-NOR is located in the telomeric region of the long arm of metacentric chromosome 2 and FISH revealed signals only in the telomeric region of all chromosomes. Further cytogenetic data on other amphisbaenians as well as a robust phylogenetic hypothesis of this clade is needed in order to understand the evolutionary changes on amphisbaenian karyotypes.
Amphisbaenians are fossorial squamate reptiles distributed mainly in South America and Africa. Br... more Amphisbaenians are fossorial squamate reptiles distributed mainly in South America and Africa. Brazilian worm lizards belong to the family Amphisbaenidae, which has far more recognized species than any of the other five amphisbaenian families. Morphological datasets recovered Amphisbaenidae as paraphyletic, while previous molecular phylogenetic studies did not include enough taxa to solve the generic-level relationships within this family. We present a molecular phylogenetic hypothesis based on a sample of 58 amphisbaenians, including representatives of six of the seven South American genera. Our molecular data include sequences from two mitochondrial genes (16S, ND2; 1,184 characters) and three nuclear genes (RAG-1, C-MOS, BDNF; 1,898 characters). Our phylogenetic hypothesis is not fully resolved, although it does not support the monophyly of most genera except Leposternon. Morphological characters currently used to diagnose genera of South American amphisbaenians are homoplastic, and the taxonomy based on them is not appropriate. We revise the taxonomy of this group and sink several South American genera of Amphisbaenidae (Cercolophia, Bronia, Aulura, Anops and Leposternon) into Amphisbaena.
A Biota Neotropica é uma revista eletrônica e está integral e gratuitamente disponível no endereç... more A Biota Neotropica é uma revista eletrônica e está integral e gratuitamente disponível no endereço http://www.biotaneotropica.org.br Biota Neotropica is an electronic, peer-reviewed journal edited by the Program BIOTA/FAPESP: The Virtual Institute of Biodiversity. This journal's aim is to disseminate the results of original research work, associated or not to the program, concerned with characterization, conservation and sustainable use of biodiversity within the Neotropical region.
A Biota Neotropica é uma revista eletrônica e está integral e gratuitamente disponível no endereç... more A Biota Neotropica é uma revista eletrônica e está integral e gratuitamente disponível no endereço http://www.biotaneotropica.org.br Biota Neotropica is an electronic, peer-reviewed journal edited by the Program BIOTA/FAPESP: The Virtual Institute of Biodiversity. This journal's aim is to disseminate the results of original research work, associated or not to the program, concerned with characterization, conservation and sustainable use of biodiversity within the Neotropical region. Biota Neotropica é uma revista do Programa BIOTA/FAPESP -O Instituto Virtual da Biodiversidade, que publica resultados de pesquisa original, vinculada ou não ao programa, que abordem a temática caracterização, conservação e uso sustentável da biodiversidade na região Neotropical. Serra Geral do Tocantins, Jalapão region, Tocantins and Bahia States. Biota neotrop. 11(1): http://www. biotaneotropica.org.br/v11n1/en/abstract?article+bn03511012011.
The genus Odontophrynus consists of 11 species of medium-sized frogs distributed across south and... more The genus Odontophrynus consists of 11 species of medium-sized frogs distributed across south and east South America. This study examines and describes the chondrocrania and oral cavities of O. americanus, O. maisuma, O. carvalhoi, and O. cultripes, and review current knowledge about the larval external morphology of the genus. Twenty-one tadpoles were cleared and double-stained for chondrocranium description and five tadpoles were dissected for analysis in a scanning electron microscope. The presence of a tectum parientale may be considered here as a putative synapomorphy of the genus. The O. americanus and O. cultripes species groups were partially differentiated by the length of the processus pseudopterigoideus, shape of divergence of the hypobranchial plates, number of postnarial papillae, and number of projections of the lateral ridge papillae. The larvae of O. occidentalis species group, in turn, differed from others by presenting a greater total length.
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