ABSTRACT New trilobites from the upper part of the Pusa Formation (base of Cambrian Stage 3) in Central Spain are studied for their systematic and biostratigraphic significance. The trilobites Proabadiella toletana n. gen. et sp., Proabadiella vidalii n. gen. et sp., and a genus et species indet. are recorded with other fossils from the lower Ovetian regional Stage and archaeocyathan Zone I, which had, until now, provided only undetermined trilobites. The Proabadiella morphology is intermediate between that of the oldest genera of trilobites belonging to the families Abadiellidae and Bigotinidae, confirming the old age inferred for the new trilobites co-occurring with the archaeocyathan assemblage. Our findings permit presenting a new trilobite zonation for the lower Ovetian regional Stage (lower Cambrian Stage 3). A correlation is proposed with the other stratigraphically lowermost trilobites recorded globally.

中文翻译：

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西班牙下奥维特阶（下寒武纪第 3 阶段）三叶虫分带及其与西冈瓦纳的相关性

摘要 研究了西班牙中部 Pusa 组上部（寒武纪第 3 期底部）的新三叶虫的系统和生物地层意义。三叶虫 Proabadiella toletana n. 将军 et sp., Proabadiella vidalii n. 将军 et sp.，和一个属 et 种 indet。与来自较低奥维特地区阶段和古生物区 I 的其他化石一起记录，到目前为止，这些化石只提供了未确定的三叶虫。Proabadiella 的形态介于 Abadiellidae 和 Bigotinidae 科最古老的三叶虫属之间，证实了推测的新三叶虫与古生物群同时出现的年龄。我们的研究结果允许为下奥维特地区阶段（下寒武纪第 3 阶段）提出一个新的三叶虫分带。