版纳鱼螈和双带鱼螈核型的比较研究

本文对版纳鱼螈的核型作了观察,并与双带鱼螈进行了比较。两者的核型基本一致,均为2n=42,但版纳鱼螈的NF=62,而双带鱼螈的NF=60;版纳鱼螈的染色体有中部着丝粒、亚中部着丝粒和端部着丝粒三种类型,而双带鱼螈则无亚中部着丝粒的染色体。

THE KARYOTYPE OF ICHTHYOPHIS BANNANICA AND COMPARISION WITH I.GLUTINOSUS

The karyotypc of Ichthyophis bannanica has been studied by using the preparations of its peripheral lymphocytes. The diploid number is 2n = 42. The fundamental number (NF) of chromosome arms is 62. The relative length, arm ratio, and centromere position of each chromeosome are listed in table 1 and illustrated in figure 1. Chromosomes 1 and 2 are easily distinguished by their large size and metacentric morphology. No. 3 is also readily identified as it is a large bi-armcd chromosome with one arm visibly shorter than the other. Compared the karyotype of I. bannanica with the karyotype of I.glutinosus, both species have a karyotypc with 2n = 42, whereas NF = 62 in /. bannanica, NF=60 in /. glutinosus, chromosomes 3 and 11 are submetacontries in I. bannanica, but arc teloccntrics in I. glutinosus.