贵州剑河寒武系凯里组软舌螺动物化石丰富、埋藏形式多样, 其中以脊状单臂螺Haplophrentis carinatus化石数量最多、保存最为完整。过去有关学者对凯里组单臂螺化石的研究主要集中在化石分类学方面, 对脊状单臂螺埋藏特征及与其他生物共生关系缺乏深入探讨。本文对324块脊状单臂螺化石标本进行系统研究对比后发现: 凯里组脊状单臂螺口盖化石埋藏形式有四类: 口盖单独保存、口盖以内模或外模化石形式保存、口盖与锥壳完全绞合保存、口盖与锥壳不完全绞合保存; 附肢保存较少; 锥壳多以内模化石形式保存; 脊状单臂螺内模化石与印痕化石上普遍出现类似软体保存形成的三分叉结构, 这类三分叉结构属于后期埋藏因素造成的次生结构; 文中还对脊状单臂螺与始海百合共生关系进行探讨, 并将二者共生关系归为偏害共生。
The Cambrian Kaili Formation in Jianhe, Guizhou province yielded abundant hyolitha fossils, among which Haplophrentis carinatus accounted for the largest proportion and was the most well-preserved. Previous researches on Haplophrentis carinatus were merely limited to taxonomy, lacking further discussion on the taphonomic features of Haplophrentis carinatus and its symbiotic relationship with other organisms. Herein, we conducted a systematic research on 324 specimens of Haplophrentis carinatus. Four taphonomic modes of opercula were recognized: separately preserved opercula, internal or external molds of opercula, partially and completely?articulated opercula. Few helens were preserved and conchs were mainly preserved as internal molds. In addition, a trident-like structure occurring on internal molds or fossil impressions, which resembles soft-tissue preservation, was taphonomic artifacts. The symbiotic relationship between Haplophrentis carinatus and eocrinids was also discussed and treated as an amensalism.
国家自然科学基金(49060010,49462010), 国家攀登专项(95-专-01-1-6), 贵州省科技基金, 国家973项目(2006CB806401)