New brachiopods from the Lower-Middle Ordovician (Billingen-Volkhov stages) of the East Baltic
Eva Egerquist
Two new rhynchonelliformean brachiopods, Neumania paucicostata sp. nov. and Leoniorthis robusta gen. et sp. nov., are described from the Billingen and Volkhov stages (Lower-Middle Ordovician: Arenig) of the Baltic-Ladoga Klint area. All specimens were washed out from unconsolidated sediments, and were sampled in Tallin, Estonia, and at three localities in St. Petersburg district, Russia. Numerous specimens were found in a large mud mound, the lower part of which is within the Baltoniodus triangularis conodont Zone, otherwise usually missing in this area. L. robusta is here assigned to the family Orthidae.
Key words: Brachiopoda, Clitambonitidae, Orthidae, Ordovician, Russia, Estonia.
Eva Egerquist [eva.egerquist@pal.uu.se], Department of Earth Sciences, Historical Geology and Palaeontology, Norbyvägen 22, SE−75236, Uppsala, Sweden.
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