文章从三叶虫的头尾搭配问题的讨论对"也论Protaitzehoia Yang三叶虫的分类位置"一文中置于原太子河虫属的某些尾部的可靠性提出了质疑,认为插图2中的尾(K),由于缺少宽而下凹的尾边缘,应属于Stephanocare Monke,1903一属的尾部;插图2中的尾(L)的归属尚难定论.将原太子河虫属的头盖、活动颊、尾部、唇瓣与Cheilocephalus Berkey,1898属的头盖、活动颊、尾部、唇瓣对比后,认为原太子河虫属应归属Cheilocephalidae Shaw,1956.

Based on study on the matching trilobite cephalon (cranidium) and pygidium, it has been demonstrated that the Protaitzehoia sp. (Peng et al ., 2003,textfig.2(I L) was established for pygidium (K) of Stephanocare Monke, 1903 (Lu et al ., 1965,pl.73,figs.5 9; Zhang and Jell,1987,pl.104,figs.5 7) belonging to Damesellidae Kobayashi,1935 and mismatched cranidia of Protaitzehoia Yang, which are unrelated to Damesellidae Kobayashi, 1935. In general configuration of cranidium, free cheek, pygidium and hypostoma, Protaitzehoia Yang is closely related to Cheilocephalus Berkey,1898 (Rasetti,1965,pl.17,figs.1 14). Protaitzehoia Yang is, however, discriminated from Cheilocephalus Berkey,1898 only by its deeper glabellar furrows, more or less pygidial indentation at rear and granular sculpture on the surface of exoskeleton, therefore Protaitzehoia Yang is here attributed to the Cheilocephalidae Shaw,1956.

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