云南澄江及梅树村早寒武世黑林铺组（玉案山段及石岩头段）的帽形化石，被命名为云南太阳女神螺（新种），这是澄江生物群内软体动物化石的初次发现。根据梅树村及澄江的地层层位，该种由梅树村阶上部可延至筇竹寺阶，玉案山段软体动物稀少的原因与环境的波动，如潮汐影响近海沉积环境有关。

A small cap shaped fossil from the Shiyantou and Yuanshan Members of the Heilinpu Formation (Lower Cambrian) of eastern Yunnan, China, is here referred to the new species Helcionella yunnanensis. The holotype of the species represents the first record of a helcionelloid mollusk from strata yielding the Chengjiang Biota in the upper part of the Heilinpu Member. Its stratigraphic range, based on two occurrences, is through the upper part of the Meishucunian Stage and into the Qiongzhusian Stage. Rarity of the species in the Yuanshan Member of the Heilinpu Formation may be related to fluctuating environmental condition associated with the inferred tidally influenced, coastal marine depositional environment in which the Chengjiang Biota was preserved.

Q915.817

国家重点基础研究发展规划项目 (G2 0 0 0 0 7770 0 0 )，国家自然科学基金 (No .48870 0 73 )，美国国家科学基金 (EAR 940 5 990EAR 95 2 670 9)资助课题