Karyotype homology between Calotes versicolor and C. mystaceus (Squamata, Agamidae) from northeastern Thailand
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Karyotypes of Calotes versicolor and Calotes mystaceus from Khon Kaen Province, northeastern Thailand were investigated. Chromosome preparations were conducted by squash technique from bone marrow. Conventional Giemsa staining and Ag-NOR banding technique were applied to stain the chromosomes. The results showed that the diploid number of C. versicolor and C. mystaceus were 34 in both the species, while the fundamental number (NF) was 46 in both sexes of these species. The types of chromosomes were: four large metacentric, two large submetacentric, four medium metacentric, two small metacentric and 22 microchromosomes in the genus Calotes. NORs of these species were located at the secondary constriction to the telomere on the long arm of the large submetacentric chromosome pair no. 2. No difference was found in karyotypes of chromosomes prepared from the male and female agamid lizards used in the present study. The karyotype formulae of C. versicolor and C. mystaceus were found to be the same and were presented as 2n (34) = Lm 4 + Lsm 2 + Mm 4 + Sm 2 + 22 microchromosomes.
KeywordsCalotes versicolor Calotes mystaceus Chromosome Karyotype
This work was financially supported in part by a full scholarship from the Science Achievement Scholarship of Thailand (SAST) and the Cytology and Ecotoxicology Research Group, Faculty of Science, Khon Kaen University. Prateep Duengkae is the recipient of Research Chair Grant, the National Science and Technology Development Agency (NSTDA), Thailand. Our special thank goes to Robert H. Orr for editing an earlier manuscript.
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