Seuanez H N, Forman L, Alves G
Genetics Section, National Cancer Institute, Frederick, MD 21701.
J Hered. 1988 Nov-Dec;79(6):418-24.
A G-band karyotypic analysis was carried out in individual species groups of three Callitrichid primate genera: Cebuella, Callithrix, and Leontopithecus. Within Callithrix, the karyotypes of the morphologically distinct and geographically isolated morphotypes C. jacchus jacchus and C. jacchus penicillata were identical. Within the lion tamarin genus, Leontopithecus, the karyotypes of the three morphotypes (L. rosalia rosalia, L. rosalia chrysomelas and L. rosalia chrysopygus) were also indistinguishable from one another. These results are consistent with the taxonomic designation of subspecies rank to the different morphotypes. A comparison of type specimens among the three Callitrichid genera showed that their phyletic radiation has been paralleled by a limited number of chromosome rearrangements and a relatively high amount of karyotypic invariance. A fusion/fission event has been postulated to account for the difference in diploid number between Cebuella (2n = 44) and the other species (2n = 46). The karyotype of Callithrix jacchus was found to be more directly derived from Cebuella than was that of Leontopithecus. These findings differ from the previous proposition that Leontopithecus might have diverged from a common Callitrichid ancestor before the emergence of the genus Callithrix.
对三种狨猴科灵长类动物属（倭狨属、狨属和狮狨属）的各个物种组进行了G带核型分析。在狨属中，形态上不同且地理上隔离的形态型——普通狨指名亚种和普通狨饰冠亚种的核型是相同的。在狮狨属中，三种形态型（金头狮狨指名亚种、金头狮狨黑腹亚种和金头狮狨金臀亚种）的核型彼此也无法区分。这些结果与将不同形态型归为亚种等级的分类学指定一致。对这三个狨猴科属的模式标本进行比较表明，它们的系统发育辐射伴随着有限数量的染色体重排和相对较高的核型不变性。有人提出了一个融合/裂变事件来解释倭狨属（2n = 44）与其他物种（2n = 46）之间二倍体数目的差异。发现狨的核型比狮狨的核型更直接地源自倭狨属。这些发现与之前的观点不同，之前认为狮狨属可能在狨属出现之前就已从一个共同的狨猴科祖先分化出来。
