New developments in vertebrate cytotaxonomy IV. Cytogenetic studies in reptiles

Peccinini-Seale, Denise Maria

doi:10.1007/bf00055413

Cited by 26 publications

(16 citation statements)

References 72 publications

(50 reference statements)

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“…Foi determinado o número fundamental (NF) de cada espé-cie, ou seja, a soma do número de braços dos macrocromossomos, considerando telocêntricos e subtelocêntricos como 1, metacêntricos e submetacêntricos como 2 braços (Matthey 1949). Os cariótipos foram descritos de acordo com a fórmula 2n (I; II; III), sendo que o I se refere ao número de macrocromossomos metacêntricos e submetacêntricos,; o II, ao número de macrocromossomos telocêntricos e subtelocêntricos e o III, ao número de microcromossomos segundo Peccinini-Seale (1981).…”

Section: Methodsunclassified

Estudo cariotípico de duas espécies brasileiras do gênero Micrurus (Ophidia: Elapidae)

2007

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The karyotypes of two brazilian species of coral snakes (Ophidia: Elapidae): Micrurus corallinus and M. ibiboboca are described for the first time. Cytological preparations were obtained through the technique of squashing, followed by conventional Giemsa staining. The diploid number for Micrurus corallinus was 40 chromosomes with a karyotype formulae 40 (4; 16; 20) with a secondary constriction in the second pair of subtelocentric macrochromosomes. Micrurus ibiboboca is described by the formulae 42 (2; 20; 20) with 2n = 42 with a secondary constriction in the first pair of telocentric macrochromosomes. The karyotypes of M. corallinus and M. ibiboboca present aspects similar to M. lemniscatus and M. surinamensis, the only previously analyzed species of this genus in South America. These four species have the same number of microchromosomes (20), the largest number of telocentric or subtelocentric macrochromosomes and the largest diploid numbers (2n) ever found in the genus Micrurus. These characteristics differ from those of the nine known species of Central America.Keywords

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Section: Methodsunclassified

Estudo cariotípico de duas espécies brasileiras do gênero Micrurus (Ophidia: Elapidae)

2007

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“…Nucleolar organizer regions, Ag-NORs, were stained according to Peccinini-Seale & Almeida (1986), modified for lizards by Bloom & Goodpasture (1976) and Howell & Black (1980). The chromosome nomenclature follows Levan et al (1964) and the karyotype description, Peccinini-Seale (1981). We made the photographs on a Zeiss microscope with 1250X magnification.…”

Section: Methodsmentioning

confidence: 99%

“…Cnemidophorus contains 32 species with numerical and structural variability in the karyotypes, chromosomal numbers ranging from 46 to 52 in diploid species, 69 to 71 in triploids, and 92 in tetraploids (Peccinini-Seale, 1969;Gorman, 1970;Peccinini-Seale, 1981, 1989. The karyotype variation observed in this genus indicates that centric fusions and/or fissions and pericentric inversions have occurred.…”

Section: Introductionmentioning

confidence: 99%

“…Sex chromosome evolution in lizards is considered to be relatively recent and data from some families suggest that they have multiple origins (Beçak, 1983). There are species with chromosomal sex determination mechanisms ascribed to male heterogamety in the families Iguanidae (see Frost & Etheridge, 1989), Lacertidae, Teiidae, Scincidae, and Pygopodidae; female heterogamety is known in the families Gekkonidae, Varanidae, and Lacertidae (for a review, see Peccinini-Seale, 1981 and references therein). In the genus Cnemidophorus, Cole et al (1969) and Bull (1978) reported a chromosomal sex determination mechanism of the type XX:XY for Cnemidophorus tigris.…”

Section: Introductionmentioning

confidence: 99%

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Cytogenetics of the Brazilian whiptail lizard Cnemidophorus littoralis (Teiidae) from a restinga area (Barra de Maricá) in Southeastern Brazil

et al. 2004

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Chromosomes of Cnemidophorus littoralis, a new species of teiid lizard recently described, were studied. The animals are from a restinga area in Barra de Maricá, RJ. The karyotype presents a diploid number of 2n = 46 chromosomes and a chromosomal sex determination mechanism of the type XX:XY. Nucleolar organizer regions, Ag-NORs, are at the sixth pair of chromosomes; there is variability of size and number of the Ag-stained nucleoli on the 50 interphase nuclei for each specimen analyzed. These nucleoli are related to NOR patterns that also demonstrated variability in size and number. This paper presents the first description of the karyotype of Cnemidophorus littoralis and of a chromosomal sex determination mechanism of the XX:XY type in the genus Cnemidophorus from Southeastern Brazil.Key words: restinga, lizards, karyotype, sex chromosomes. RESUMO Citogenética de Cnemidophorus littoralis (Teiidae) da restinga da Barra de Maricá no Sudeste do BrasilEstudamos os cromossomos de Cnemidophorus littoralis, uma nova espécie de lagarto recentemente descrita, pertencente à família Teiidae. Os animais são oriundos de uma população de restinga na Barra de Maricá, RJ. O cariótipo apresenta número diplóide 2n = 46 cromossomos, com mecanismo cromossômico de determinação do sexo do tipo XX:XY. As regiões organizadoras do nucléolo, Ag-RONs, estão no sexto par de cromossomos. Analisamos 50 núcleos interfásicos corados pela prata para cada exemplar e observamos variação quanto ao número e ao tamanho de nucléolos; estes estão relacionados aos padrões RONs, que também apresentaram variação quanto ao tamanho e ao número. Este trabalho também descreve pela primeira vez a presença de um mecanismo de determinação cromossômica do sexo para o gênero Cnemidophorus do Sudeste do Brasil.Palavras-chave: restinga, lagartos, cariótipo, cromossomos sexuais, espécie endêmica.

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“…Terminology for chromosomal descriptions follows Green and Sessions (1991), and the karyotype formula follows Peccinini-Seale (1981). Voucher specimens were deposited in the Zoological Reference Collection, Department of Biological Sciences, National University of Singapore (ZRC) and Herpetological Collection, Department of Zoology, Kyoto University (KUZ).…”

Section: Methodsmentioning

confidence: 99%

On the Monophyly of the Agamid Genus Gonocephalus Kaup, 1825 (Reptilia: Squamata). A Chromosomal Perspective.

et al. 2000

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New developments in vertebrate cytotaxonomy IV. Cytogenetic studies in reptiles

Cited by 26 publications

References 72 publications

Estudo cariotípico de duas espécies brasileiras do gênero Micrurus (Ophidia: Elapidae)

Estudo cariotípico de duas espécies brasileiras do gênero Micrurus (Ophidia: Elapidae)

Cytogenetics of the Brazilian whiptail lizard Cnemidophorus littoralis (Teiidae) from a restinga area (Barra de Maricá) in Southeastern Brazil

On the Monophyly of the Agamid Genus Gonocephalus Kaup, 1825 (Reptilia: Squamata). A Chromosomal Perspective.

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