描述陕南地区下寒武统筇竹寺阶软舌螺化石６属８种，其中有５新属（Ningqiangethus gen.nov.,Bilgulitheca gen.nov.,Xixiangethes gen.nov.,Paranicrocornus gen.no.,Inflatatheca gen.nov.),新种，１相似种，１未定种。从组织结构和面貌上论述筇竹寺阶软舌螺和梅树村阶软舌螺匠区别，筇笔直寺阶的软舌螺不仅个体增大、背腹分异、口唇发育、壳体与口盖常共存，而且属种分异度大，为进一步研究软舌螺动物的早期演化和解决下寒武统生物地层划分为对比提供重要的实证材料。

This paper deals with the hyoliths from the Lower Cambrian Chiungchussuan Stage of Southern Shaanxi. 6 genera and 8 species have been described, including 5 new genus, 7 new species and one comparable species. Based on the analysis of assemblage features and shell structures, it is possible to distinguish it from the hyoliths assemblage of the Meishucunian Stage. The fauna considered here is characterized not only by larger shells, ventral and dorsal features of shells, apertural lips and operculum co occurred with cones, but also by higher diversity. So it is an important useful evidence for study of the early evolution of hyoliths and biostratigraphic correlation of the Lower Cambrian.

Q915.817

国家攀登项目! (攀 95 专 0 1 2 3 )，国家重点基础研究发展规划项目! (G2 0 0 0 0 7770 0 )资助成果。