Canavez F, Alves G, Fanning T G, Seuánez H N
Genetics Section, Instituto Nacional de Câncer (INCa), Praça da Cruz Vermelha 23, 20230-130 Rio de Janeiro, Brazil.
Chromosoma. 1996;104(5):348-57. doi: 10.1007/BF00337224.
Chromosomal studies in three species of Amazonian Callithrix (2n=44) and data in the literature show that this group is karyomonotypic. Moreover, it is characterized by the presence of abundant heterochromatic regions, unlike the situation in congeneric forms of Callithrix of the Atlantic coast with 2n=46, and by the presence of a highly repetitive, exclusive DNA component, with a basic repeat motif of 1528bp. Karyotypic comparisons with other Callitrichids and an outgroup species showed that Callitrichids are karyologically conserved and explained several rearrangements that had presumably occurred during their phyletic radiation. Analyses of karyologic data enabled the construction of two alternative phylogenetic topologies. The lack of derived homoeologies, common to all members of the genus Callithrix grouped at present, and the fact that Amazonian species were more similar to Cebuella pygmaea (2n=44) than to their congeneric forms with 2n=46 suggested that species at present included in the Amazonian Callithrix should be grouped with C. pygmaea.
对三种亚马逊伶猴（2n = 44）的染色体研究以及文献中的数据表明，该类群是核型单型的。此外，其特征是存在丰富的异染色质区域，这与大西洋沿岸2n = 46的同属伶猴属物种的情况不同，并且存在一种高度重复的、独特的DNA成分，其基本重复基序为1528bp。与其他狨科动物和一个外类群物种的核型比较表明，狨科动物在核型上是保守的，并解释了在其系统发育辐射过程中可能发生的几种重排。对核型数据的分析使得能够构建两种不同的系统发育拓扑结构。目前归为伶猴属的所有成员缺乏衍生的同祖性，以及亚马逊物种与倭狨（2n = 44）比与2n = 46的同属物种更相似这一事实表明，目前包含在亚马逊伶猴中的物种应与倭狨归为一类。
