New Tithonian and Lower Berriasian aptychi of Stramberk Limestone from the Kotou Quarry (Outer Western Carpathians, Czech Republic)

A new collection of aptychi from the Stramberk Limestone in the Kotou Quarry near Stramberk is presented in this paper as seven species (parataxonomic system) of ribbed calcareous valves. Their stratigraphic position is mostly supported by the occurrence of time-diagnostic ammonites. Four species are new: Beyrichilamellaptychus companyi sp. nov., B. hoedemaekeri sp. nov., B. jansseni sp. nov. and Thorolamellaptychus kleini sp. nov. The mentioned new species as well as B. studeri occur in the Upper Tithonian-Lower Berriasian interval, whereas Punctaptychus punctatus and Beyrichilamellaptychus beyrichi are well known by their wider stratigraphic range: Tithonian-Berriasian.