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

2003; University of Florence; Volume: 56; Issue: 1 Linguagem: Inglês

10.1080/00087114.2003.10589313

2165-5391

Lauren Betina Veronese, Thales Renato Ochotorena de Freitas, Lı́gia Krause,

Genetic diversity and population structure

Abstract Four species (Ameiva ameiva, Cnemidophorus lacertoides, Teius oculatus, Tupinambis merianae) of Brazilian Teiidae lizards (Squamata, Teiidae) were studied cytogenetically, a sample of 26 being collected from five sites in Brazil. We found that A. ameiva had a 2n=50 karyotype and silver staining showed that the nucleolus organizer region (NOR) was located in a medium sized acrocentric macrochromosome pair. The karyotype of C. lacertoides was 2n=50 and there was heterochromatin in the centromeric areas of the macrochromosomes. In the case of T. oculatus the karyotype was 2n=54 with the NOR being located in the secondary constriction of chromosome pair 10 although there was no evident C-banding. With T. merianae the karyotype was 2n=38 and the NOR was located in the secondary constrictions of chromosome pair 2, with a slightly marked centromeric area in chromosome pair 5. Little constitutive heterochromatin was observed in the C-banding studies, although the centromeric and telomeric areas of the macrochromosomes of A. ameiva were positive for C-banding.