Chromosomal relationships and phylogenetic and clustering analyses on genus Callithrix, group argentata (Callitrichidae, Primates)
94Nagamachi C.Y. · Pieczarka J.C. · Barros R.M.S. · Schwarz M. · Muniz J.A.P.C. · Mattevi M.S.
aDepartamento de Genética, Universidade Federal do Rio Grande do Sul, Porto Alegre; bDepartamento de Genética, Universidade Federal do Pará, Belém, PA; cZoobotânico Marcos Schwarz, Curitiba, PR; dCentra Nacional de Primatas, FSESP, Belém, PA (Brasil)
The karyotypes of three species of marmosets of the Callithrix argentata group (C. argentata, C. humeralifera and C. chrysoleuca) were studied. Comparisons were made among species and with the previously described karyotypes of C. emiliae, C. mauesi (argentata group) and C. jacchus (jacchus group). Two chromosome rearrangements differentiate the argentata (2n = 44) and jacchus (2n = 46) groups: a fusion or fission and a paracentric inversion. The argentata group is also characterized by the addition of large amounts of distal constitutive heterochromatin (CH) in some chromosomes, while the jacchus group shows mainly centromeric heterochromatin. The five species of the argentata group differ in the amount or location of the distal CH. Interspecific differences were converted to a Basic Data Matrix (BDM), that was submitted to phenetic and cladistic analyses. For cladistic analyses C jacchus was the outgroup. The results agree with morphological and geographical data.
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