Lacunites jaroslavi, a new species of paterinate brachiopod, is described from the Klabava Formation (Lower Ordovician: Floian/Dapingian boundary interval) of the Barrandian area in the Czech Republic. It is an uncommon component of a fossil assemblage dominated by minute brachiopods, dendroids and graptoloids which indicate a deeper marine environment.
The new species is very similar to the approximately contemporaneous Lacunites balashovae of the Baltic area. Occurrence of paterinates in the Tremadocian, Floian and Dapingian of the Barrandian confirms the special position of the Perunica terrane in a high-latitude region of Gondwana in the Early Ordovician.