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文中系统描述了新疆乌什 -阿克苏地区下寒武统玉尔吐斯组软舌螺口盖和口盖状化石 5属 7种 ,其中包括 2新属 3新种。Xystritheca的口盖具有复杂的锁骨构造 ,Pachytheca的口盖有明显的背腹扇面之分 ,它们与具口唇的软舌螺 Microcornus共生。这些演化上较高级的软舌螺与原牙形类 Jiangshanodus,Gapparodus,Amphigeisina;假牙形类 Rhombocorniculum;腕足类 Obo-lus;高肌虫 Dabashanella;托莫特壳类 Tannuolina以及属种未定的三叶虫碎片一起组成了玉尔吐斯组新的小壳化石组合面貌。这些化石属种在梅树村期地层中是没有见过的 ,只在国内外相当于筇竹寺期地层中出现 ,有的还被视为筇竹寺阶的标准化石 ,因此新疆玉尔吐斯组的时代只能相当于筇竹寺期。
The paper describes 7 species of 5 genera, including 3 new genera and 2 new genera, from the Lower Cambrian Yultexu Formation in the Wushi-Aksu region, Xinjiang. The Xystritheca flap has a complex clavicle structure, and the Pachytheca flap has a distinct dorsoventral segment that coexists with the labellum Microcornus. These evolutionary higher-grade soft-shelled golulas and the primitive dentates Jiangshanodus, Gapparodus and Amphigeisina, Rhombocorniculum, Obo-lus, Dabashanella, and Tannuolina, The fragments together form the new shell fossil assemblage of the Yurtusi group. These fossils have not been seen in the Meishu Period, and are only found in the strata that is equivalent to the Qiongzhu Period at home and abroad. Some are also considered as standard fossils of the Qiongzhu Temple order. Therefore, Sri Lanka group era can only be equivalent to Qiongzhu period.