Taxon - Odkazy a literatura
Mergl M. (2003): Silicified brachiopods of the Kotýs Limestone (Lochkovian) in the Bubovice area (Barrandian, Bohemia), Acta Mus. Nat. Pragae, Ser. B, Hist. Nat., 59 (3–4): 99–150. Praha [jako Parmorthina protopragenis Havlíček, 1977]