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Cytogenetic study of the genus Saguinus (Callithrichidae, Primates)
Sandra Maria Mendes de M. DantasI; Regina Maria de Souza ΒarrosII
IDepartamento de Biologia, Centro de Ciências da Natureza, Universidade Federal do Piauí, Campus Universitário da Ininga, 64049-550 Teresina, PI, Brasil. Fax/Phone: (086) 232-1729 or (086) 234-1910. E-mail: ealencar@mnnet.com.br. Send correspondence to S.M.M.M.D.
IIDepartamento de Genética, Centro de Ciências Biológicas, Campus Universitário do Guam, Belém, PA, Brasil. Fax/Phone: (091) 211-1627.
ABSTRACT
Eight subspecies from the genus Saguinus (S. fuscicollis fuscicollis, S. fuscicollis weddelli, S. bicolor bicolor, S. bicolor martinsi, S. mystax mystax, S. imperator imperator, S. midas midas, and S. midas niger) were studied. Five of them (S. f. fuscicollis, S. f. weddelli, S. b. martinsi, S. m. mystax and S. i. imperator) had their karyotypes described for the first time. Conventional coloration, banding patterns G, C and NOR, and G/C sequential banding tecniques were used. All samples showed the same diploid number (2n = 46). The patterns of the G, C and NOR bands were very similar with little differences in the quantity and constitutive heterochromatin distribution of the autosomes. Constitutive heterochromatin was observed only in telomeric regions of some chromosomes of S. f. fuscicollis and S. f. weddelli. The X chromosome was the same in all subspecies, but chromosome Y differed in size and morphology. XX/XY chimerism was verified in all subspecies.
Keywords: Cytogenetic; Saguinus; Primates.
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