The hyolith Biskolites iactans gen. et sp. nov. of the family Carinolithidae Valent et al., 2011 is described from the lower stratigraphic levels of the mid-Cambrian (Drumian) Buchava Formation of the Skryje-Tyrovice Basin in the Barrandian area of the Czech Republic. This new taxon is based on excellently preserved external and internal moulds of the operculum and conch collected from carbonate nodules and shale.