Gracilitheca and Nephrotheca (Hyolitha, Orthothecida) in the Cambrian of the Barrandian area, Czech Republic

Abstract

Five orthothecid hyoliths, Gracilitheca mirabilis sp. nov., Gracilitheca triangularis sp. nov., Gracilitheca sp., Nephrotheca betula sp. nov. and Nephrotheca sp. are described from the ‘middle’ Cambrian Buchava Formation of the Skryje–Týřovice Basin in the Czech Republic. The new forms are based on about forty well-preserved external and internal moulds of conchs; opercula of all species remain unknown.

Stratigraphic ranges and geographic distributions within the Skryje–Týřovice Basin are established for all taxa.

Keywords

• Hyoliths
• Orthothecids
• "middle' Cambrian
• Skryje–Týřovice Basin
• Barrandian area
• Czech Republic