版纳鱼螈的骨骼系统

以我国特有的珍稀濒危两栖动物版纳鱼螈(Ichthyophis bannanica)为材料,采用传统的脊椎动物骨骼标本制作技术与透明骨骼标本制作技术相结合的方法,对其骨骼系统进行了形态学研究,并与其他无足目和两栖动物相比较,探讨版纳鱼螈的亲缘关系和进化地位。结果表明,版纳鱼螈成体具头骨41枚,椎骨108~115枚,肋骨101~108枚,无四肢骨。头骨、椎骨和肋骨均具有适应于穴居、掘穴和夜行性习性的特征。版纳鱼螈与双带鱼螈(I.glutinosus)的头骨极为相似,却具有比Dermophis mexicanus的头骨更原始的特征。

A Study on Skeletal System of Ichthyophis bannanica

The traditional and transparent technique for making skeleton specimen is applied to study the morphology of the skeleton of Ichthyophis bannanica,an endangered amphibian species in mainland China.The evolution of I.bannanica is also investigated by comparing its skeletons with other Caecilians and amphibians.The results show that adult I.bannanica possesses 41 separate skull bones,108-115 vertebrae and 101-108 pairs of ribs,without any limb bones.The traits of the I.bannanica,which are adapt to their fossorial,troglobic and nocturnal habits,are discovered.The skull of I.bannanica is similar to that of I.glutinosus,however,the former is more primitive.