Chromosomal Variation, Nucleolar Organizers and Constitutive Heterochromatin in the Genus<i>Ambiva</i>and<i>Cnemidophorus</i>(Sauria; Teiidae)

Peccinini-Seale, Denise Maria; Almeida, Thais Oliveira

doi:10.1080/00087114.1986.10797785

Cited by 9 publications

(14 citation statements)

References 18 publications

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“…The diploid number (2n = 50) for A. ameiva found in this study confirms that reported in the literature (PECCININI 1969;GORMAN 1970;BEÇAK et al 1972;PECCININI-SEALE and ALMEIDA 1986). Even so, there are disagreements concerning the number of microchromosomes, macrochromosomes and metacentric microchromosomes as well as the number and position of NORs.…”

Section: Discussionsupporting

confidence: 74%

“…PECCININI-SEALE and ALMEIDA (1986) observed patterns of constitutive heterochromatin mainly in the telomeric areas of most A. ameiva and C. lemniscatus chromosomes, although some heterochromatin was also observed in some centromeric macrochromosomes, these authors finding that microchromosomes were almost completely heterochromatic in both species. ANDRADE et al (1996) found a faint C-band pattern in the centromeric areas of a pair of acrocentric macrochromosomes from a female A. ameiva specimen from the municipality of Santo Amaro in the Brazilian state of Maranhão.…”

Section: Discussionmentioning

confidence: 76%

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Cytogenetic studies of four Brazilian species of teiid lizards (Squamata, Teiidae)

2003

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Section: Discussionsupporting

confidence: 74%

Section: Discussionmentioning

confidence: 76%

Cytogenetic studies of four Brazilian species of teiid lizards (Squamata, Teiidae)

2003

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“…Cytogenetic analyses were conducted via techniques adapted for lizards by Peccinini-Seale & Almeida (1986). Chromosome preparations were obtained from suspensions of bone marrow cells from the femur and vertebral column and of intestinal epithelial cells.…”

Section: Methodsmentioning

confidence: 99%

“…For each of the six male individuals from Barra de Maricá we analyzed at least 11-21 complete metaphases. 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).…”

Section: Methodsmentioning

confidence: 99%

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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“…Ameiva ameiva apresentou o mesmo número diplóide (2n=50) anteriormente descrito na literatura para espécimes de outras localidades (PECCININI-SEALE & ALMEIDA 1986, SCHMID & GUTTENBACH 1988, SITES et al 1990, VERONESE et al 2003. Todos esses autores descreveram o cariótipo de A. ameiva como formado por macro e microcromossomos acrocêntricos.…”

Section: Coloração Convencionalunclassified

Estudos evolutivos em espécies de lacertílios brasileiros da família Teiidae (Squamata), com base em dados citogenéticos e moleculares

Santos¹,

Yonenaga‐Yassuda²,

Pellegrino³

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Chromosomal Variation, Nucleolar Organizers and Constitutive Heterochromatin in the GenusAmbivaandCnemidophorus(Sauria; Teiidae)

Cited by 9 publications

References 18 publications

Cytogenetic studies of four Brazilian species of teiid lizards (Squamata, Teiidae)

Cytogenetic studies of four Brazilian species of teiid lizards (Squamata, Teiidae)

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

Estudos evolutivos em espécies de lacertílios brasileiros da família Teiidae (Squamata), com base em dados citogenéticos e moleculares

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