title: Karyological study of Amphisbaena ridleyi (Squamata, Amphisbaenidae), an endemic species of the Archipelago of Fernando de Noronha, Pernambuco, Brazil.
abstract: 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.
authors.affiliation: Departamento de Genética e Biologia Evolutiva, Instituto de Biociências, Universidade de São Paulo, São Paulo, SP Brazil.
authors.forename: Marcia Maria
authors.initials: MM
authors.lastname: Laguna
authors.forename: Renata Cecília
authors.initials: RC
authors.lastname: Amaro
authors.forename: Tamí
authors.initials: T
authors.lastname: Mott
authors.forename: Yatiyo
authors.initials: Y
authors.lastname: Yonenaga-Yassuda
authors.forename: Miguel Trefaut
authors.initials: MT
authors.lastname: Rodrigues