中国古生物文献中的三叶虫蜕壳标本

THE EXUVIE OF TRILOBITES IN THE LITERATURE OF PALAEONTOLOGY OF CHINA

统计了中国古生物文献中的 355块三叶虫蜕壳标本 ,其中 6 0 %是寒武纪的三叶虫。根据这些标本头部、自由颊、胸及尾部的保存状态将蜕壳状态划分为 8种 :状态A (缺失自由颊 ,大部分头盖与胸、尾相连 )约占 55 8% ;状态B其次约占 17 1% (缺失头部 ,但胸尾相连 ) ;状态C (自由颊脱开不远、头盖与胸、尾相连 )与状态D (胸尾相连、头脱开在前不远 )各占 9 2 % ;状态E -H仅占 8 7%。并根据标本的蜕壳状态划分了

samples of exuvie of trilobite in the literature of palaeontology of China are mentioned, 60% of them belong to Cambrian. They are divided into 8 exuvie forms according to these forms of cephalon, librigenae , thoracic and pygium: form A (librigenae absent, cranidium and thoracic join up with pygidium); form B (cephalon absente, only thoracic and pygidium); form C (carnidium and thoracic join up with pygidium, librigenae dislocation, but not far away) and form D (thoracic join up with pygidium, cephalon dislocation in front of body) amounting 55 8%,17 1%,9 2%,9 2%, respectively, only 8 7% of them belong to the form E-H. According to these forms, there are three exuvie methods.