Revision of the Cambrian Agnostina (Trilobita?) from Russia

摘要: Cambrian genera and species of Agnostina (?Trilobita) found in Russia are revised. Agnostid trilobite used as index taxa chronostratigraphic subdivisions the traditional Middle Upper both regional global stratigraphic scales. The correlation international schemes largely depends on state knowledge agnostid fauna. Therefore, an up-to-date revision this group based Russian collections taking into account their diversity is very timely. For study we reexamined type agnostids, including holotypes described by authors. This paper contains new photographic images housed museums. compiled data offered solutions for some difficult taxonomic problems families Agnostidae, Ptychagnostidae, Peronopsidae, Pseudagnostidae, Diplagnostidae. Apart from listing diversity, serves basis studying biogeography evolution interesting arthropod group.