The morphogenesis and molecular phylogeny of two soil hypotrich ciliates, Australocirrus australis and A. aspoecki, collected from Xi’an, Shaanxi Province, China, were investigated using protargol preparation. The main features of morphogenesis of A. australis are as follows: (1) the parental adoral zone of membranelles is retained completely in the proter; (2) parental cirri and the undulating membranes are involved in the formation of six primordial streaks; (3) multiple fragmentation of the third dorsal kinety anlage; (4) more than three dorsomarginal kineties are formed. An early divider of A. aspoecki was also found, and its morphogenetic events resemble those of other Australocirrus species. Furthermore, the SSU rDNA sequence of the Shaanxi populations of A. australis and A. aspoecki was provided. The molecular phylogeny indicates that A. aspoecki clusters together with A. rubrus and two populations of A. australis with full support, which are separated from the clade comprising the two populations of A. shii.

采用普萘烷酚制剂研究了两种土壤亚线虫纤毛虫，澳大利亚南方古猿和澳大利亚A. aspoecki的形态发生和分子系统发育。A. australis形态发生的主要特征如下：（1）膜的亲代口区完全保留在前列腺中；（2）父母的卷毛和起伏的膜参与了六个原始条纹的形成；（3）第三背运动损伤的多个碎片；（4）形成了三个以上的背背肌运动。早期分频器A. aspoecki还发现，其形态发生的事件类似于那些其他的Australocirrus种类。此外，陕西种群的SSU rDNA序列A.芦苇和A. aspoecki被提供。分子系统发生指示A. aspoecki簇连同A. rubrus和两个种群A. australis的具有完全的支持，这是从进化枝包括两个群体分离A.香菇。