贵州剑河八郎寒武系苗岭统乌溜阶凯里组中保存了大量三叶虫化石, 并见有众多三叶虫蜕壳记录。本文从308块贵州东方褶颊虫(Eosoptychoparia guizhouensis)中选取出25块蜕壳标本进行研究, 根据头盖、活动颊及腹边缘板等结构单元的保存状态将这些标本归为Somersault模式、Harrington模式及Henningsmoen模式, 并对其形成过程进行简要讨论。E. guizhouensis蜕壳标本的保存模式常表现为活动颊与腹边缘板连接为一个整体从头甲中脱落后置于老壳之下或四周, 头盖多与胸甲保持连接状态或轻微裂开。现有材料表明E. guizhouensis主要通过头部缝合线(面线及腹边缘线)的断开来完成蜕壳, 由于在蜕壳过程中不同的运动方式而形成以Somersault模式、 Harrington模式及Henningsmoen模式保存。文中通过对E. guizhouensis蜕壳标本的保存模式、蜕壳方式及蜕壳过程进行阐述, 为褶颊虫类三叶虫的蜕壳模式及蜕壳过程研究提供重要依据。

A large number of trilobite exuviae discarded during moult were collected from the Kaili Formation (Cambrian Miaolingian Series, Wuliuan Stage) in Guizhou, China. In this paper, 25 out of 308 specimens were identified as moulted exoskeletons of Eosoptychoparia guizhouensis, based on the preservation status of cranidium, librigenae, and rostral plate, the moulted configurations preservation of Eosoptychoparia guizhouensis follow three modes: Somersault’s configuration, Harrington’s configuration and Henningsmoen’s configuration, whose formation process is briefly discussed as follow. The exuviaes of E. guizhouensis, in mostly cases, display a typical moult configuration, in which the librigenae connected to the rostral plate as a whole moulted and scattered below or around the exuviae, and the cranidium was connected or slightly split to the thorax. It is indicated that E. guizhouensis mainly completes the moulting by breaking the cephalon sutures (facial suture and rostral suture), and the moult configurations of Somersault’s configuration, Harrington’s configuration and Henningsmoen’s configuration are formed due to the different movement patterns during the moulting process. By describing and explaining the moult modes and process in trilobite E. guizhouensis, this paper provides new materials for the moult configurations and process in Ptychopariid trilobites.

国家重点基础项目基金(2015FY310100-5)、国家自然科学基金(41962002, 41772021)和贵州省科技计划项目(黔科合平台人才[2020]4Y241 号)联合资助