Karyotypes of a Cryptic Diploid Form of the Unisexual Leposoma percarinatum (Squamata, Gymnophthalmidae) and the Bisexual Leposoma ferreirai from the Lower Rio Negro, Amazonian Brazil

Karyotypes of a Cryptic Diploid Form of the Unisexual Leposoma percarinatum (Squamata, Gymnophthalmidae) and the Bisexual Leposoma ferreirai from the Lower Rio Negro, Amazonian Brazil

Author Laguna, Marcia M. Google Scholar
Rodrigues, Miguel T. Google Scholar
Santos, Rodrigo M. L. dos Google Scholar
Yonenaga-Yassuda, Yatiyo Google Scholar
Avila-Pires, Teresa C. S. Google Scholar
Hoogmoed, Marinus S. Google Scholar
Pellegrino, Katia C. M. Autor UNIFESP Google Scholar
Institution Universidade de São Paulo (USP)
Museu Paraense Emilio Goeldi CZO
Universidade Federal de São Paulo (UNIFESP)
Abstract Karyotypes of Leposoma show a clear differentiation between species of the scincoides group from Brazilian Atlantic Forest (2n = 52, without distinctive size groups of chromosomes) and those of the parietale group from the Amazon (2n = 44, with 20M + 24m). In a previous study, we found that in the parietale group the parthenoform Leposoma percarinatum from the state of Mato Grosso, Brazil, exhibited a triploid karyotype (3n = 66) with 30 macrochromosomes and 36 microchromosomes. It was suggested that this karyotype arose after hybridization between a bisexual species with N = 22 (10M + 12m) and a hypothetical unisexual cryptic diploid form of the L. percarinatum complex. Herein, we describe the karyotypes for two species of the parietale group occurring sympatrically in the Arquipelago das Anavilhanas, lower Rio Negro, in Amazonian Brazil. The first represents a distinctive diploid parthenogenetic clone of the L. percarinatum complex, and the other is the recently described Leposoma ferreirai. Both species have 44 biarmed chromosomes clearly represented by 20 macrochromosomes and 24 microchromosomes and present Ag-NORs in one pair of the smallest sized microchromosomes; heteromorphism of size for these regions was detected in L. percarinatum. C-banding revealed blocks of constitutive heterochromatin on the telomeric and pericentromeric regions of macrochromosomes and some microchromosomes. The description of a diploid karyotype (2n = 44, 20M + 24m) for the L. percarinatum complex and its sympatric congener L. ferreirai provides new insight for a better understanding of the origin of parthenogenesis in the L. percarinatum complex.
Language English
Sponsor Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Date 2010-03-01
Published in Journal Of Herpetology. St Louis: Soc Study Amphibians Reptiles, v. 44, n. 1, p. 153-157, 2010.
ISSN 0022-1511 (Sherpa/Romeo, impact factor)
Publisher Soc Study Amphibians Reptiles
Extent 153-157
Origin http://dx.doi.org/10.1670/08-250.1
Access rights Closed access
Type Article
Web of Science ID WOS:000275489700016
URI http://repositorio.unifesp.br/11600/44383

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