Ptychopariidae is a family of trilobites, containing the following genera: * * * Altitudella * * Asthenopsis * * * * * * * * Blairella – see * * * * * * * * Champlainia * * * * Conopolus * * * * Elrathina * * * * * * * * * * * * * * * * * * * * * Jangudaspis * * * * * * * * * * * * * * * * * * * * * * Metisella – see * * * * * * * * * * Nassovia * Nelsonia – see Paleonelsonia * * * * Nyella – * * * Ontoella * * * * * * * * Paleonelsonia * * * * * * * * * * * * * * * * * * * * * * * * * ? * * * * Ptychoparia * * * * * Regina – * *