Systematic Position of the Brachiopods Pugnoides korsakpaica Nalivkin and Leiorhynchus kiselicus Nalivkin (Order Rhynchonellida)

The type specimens of the species Pugnoides korsakpaica Nalivkin, 1937 and Leiorhynchus kiselicus Nalivkin, 1979 were re-examined using X-ray microtomography. It was not possible to clarify the systematic position of the species P. korsakpaica, but the shell interior revealed a septum and a large septalium. Specimens belonging to different genera were recognized in the type series of L. kiselicus; while most of the specimens are assigned to Orbiculatisinurostrum kiselicum, a new species is described—Paropamisorhynchus lytvensis sp. nov. No punctae were found in the shell matter of any of the studied specimens.