倭蛙属(无尾目∶蛙科)肩带研究

The Pectoral Girdles of Nanorana Species(Anura∶Ranidae)

对倭蛙属(Nanorana)已知3种:高山倭蛙(Nanorana parkeri)、倭蛙(N.pleskei)和腹斑倭蛙(N.ventripunctata)的肩带作了连续切片后进行Masson染色,发现其上喙骨(epicoracoid)的融合与重叠的状况与虎纹蛙(Rana rugulosa)较相似,而与无尾目中其它物种已知的肩带形态存在较大的差异。倭蛙属和虎纹蛙等与已知肩带类型的蛙亚科其它的物种在系统进化中可能来源于不同的最近共同祖先。

The pectoral girdles of the genus Nanorana including Nanorana parleeri, N. plesleei, N. ventripunctata, are described on the basis of cleared and double-stained specimens. The ventromedial parts of the pectoral girdles Of them were sectioned, and stained with Masson staining, The anterior epicoracoids are free and diverging from one another. Posteriorly, the epicoracoids bear a dorsomedial crevice and are fused ventrally. From a level anterior or posterior to the anterior ends of the coracoids to a level anterior or posterior to the posterior level of the coracoids, epicoracoids are overlapping, free in N. parleeri and N. ventripunctata, but fused ventrally in N. plesleei, Posteriorly, the posterior termini of epicoracoids are fused to the sternum. The pectoral girdles of the genus Nanorana are unique among anurans but bear some resemblance to that of Rana rugulosa, which suggests that the previous subfamily Raninae may be heterogeneous.