MALACOFAUNA OF THE LOWER CAMBRIAN BYSTRAYA FORMATION OF EASTERN TRANSBAIKALIA

Abstract

A monographic description of mollusks from the Lower Cambrian Bystraya Formation of Eastern Transbaikalia is presented for the first time. The mollusk assemblage includes ten species of nine genera; the following six species are new: Miroconulus sinitsae sp. nov., Anuliconus tannuelliformis sp. nov., Parailsanella sayutinae sp. nov., Stenotheca transbaikalica sp. nov., Anabarella tshitaensis sp. nov., and Mellopegma uslonica sp. nov. The taxonomic composition of the assemblage is similar to that of the Late Atdabanian–Botomian of South Australia and Mongolia.