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

VALENT, M., FATKA, O. & MAREK, L., iFirstarticle. Gracilithecaand Nephrotheca(Hyolitha, Orthothecida) in the Cambrian of the Barrandian area, Czech Republic. Alcheringa, 1–10. ISSN 0311-5518.Five orthothecid hyoliths, Gracilitheca mirabilissp. nov., Gracilitheca triangularissp. nov., Gracilithecasp., Nephrotheca betulasp. nov. and Nephrothecasp. 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.