北方山溪鲵精子发生不同阶段的显微与超微结构

用光镜和电镜观察了北方山溪鲵(Batrachuperus tibetanus)精子发生过程中各种类型生精细胞的显微与超微结构变化。结果显示,北方山溪鲵在4~8月时处于精子发生期,精子形成在7~8月。成熟精子的结构具有小鲵科精子的一些共同特征,如顶体前端呈三叶草状,尾部由轴纤维、波动膜、轴丝及轴丝旁纤维构成,轴纤维粗大呈圆柱形,尾部无线粒体等。比较分析认为,在两栖类的系统发育中,轴纤维、波动膜和轴丝旁纤维的消失为近裔性状。

Spermatogenesis in Stream Salamander Batrachuperus tibetanus:Light Microscopy and Electronic Microscopy Studies

Microstructure and ultrastructure of different stage spermatogenic cells in Stream Salamander Batrachuperus tibetanus were observed.The results show that spermatogenesis occurs during April through August and spermiogenesis occurs from July to August.The structure of spermatozoa possesses the common features of the Hynobiidae spermatozoa.The transverse section of the acrosomal vesicle is trifoliate.The tail of the spermatozoa is composed of the juxta-axonemal fibre,axoneme,axial fibre and undulating membrane.It can be concluded that the loss of axial fibre and undulating membrane is the evolution features in the amphibian phylogeny.