Genus Aotus Q- and G-Band Karyotypes and Natural Hybrids

Abstract

Q- and G-banding studies of Aotus trivirgatus trivirgatus and Aotus trivirgatus griseimembra are presented. After the analysis of 8 specimens, 2 A. t. trivirgatus and 6 A. t. griseimembra and the review of the literature on the field we state the existence of two different karyotypes, 2n = 54 and 2n = 50, for A.t.trivirgatus and three different karyotypes, 2n = 54, 2n = 52 and 2n = 50, for A. t. griseimembra. It was found that Robertsonian translocations were the mechanism involved in the numerical reduction of the chromosomes. The data presented include the statement of two natural hybrids and the cross-breedings which originated them.

Banded chromosomes of the owl monkey, <i>Aotus trivirgatus</i>

“…It appears preferable to develop a numbering system in which each chromosome has a single designation based on length and arm ratio. The lengths recorded by Yunis et al (1977) and by us for each chromosome differ by less than 0.6 % of the complement, in all but one case.…”

“…1976;Yunis, 1977). We have suggested a somewhat different arrangement based on data from general banding techniques, heterochromatin-banding techniques, and measure ments.…”

“…In their system this chromosome has two different designations, either I or 13 and 14, and they list 27 pairs of autosomes, although there are a maximum of 52 autosomes. The problems of using such a system are emphasized by the finding of a second centric fusion chromosome by Yunis et al (1977). Yunis et al measured the chromosomes and arranged them generally by length and arm ratio, but they separated the four pairs of chromosomes that were sometimes seen in centric fusion form, thus creating a dual system which would have to be altered should another centric fusion chro mosome be found.…”

“…of these polymorphisms are the result of centric fusions (Ma et al, 1976;Yunis et al, 1977). Ma et at.…”

Investigation of marmoset hybrids <i>(Cebuella pygmaea</i> × <i>Callithrix jacchus)</i> and related Callitrichinae (Platyrrhini) by cross-species chromosome painting and comparative genomic hybridization

“…Among Prosimians, hybrids between species or subspecies were most commonly described in lemurs (Rumpler and Dutrillaux, 1976;Ratomponirina et al, 1982), for example Eulemur albocollaris × Eulemur fulvus rufus and Eulemur f. fulvus × Eulemur m. macaco. In New World Monkeys interspecies hybrids both in the wild and in captivity have been documented in several genera, for example within genus Callithrix (reviewed by Coimbra-Filho et al, 1993), between squirrel monkey (sub-) species (Moore et al, 1990) and within genus Aotus (Yunis et al, 1977).…”