Ptychaspididae

Ptychaspididae is a family of trilobites, containing the following genera:


 * Alborsella
 * Changia
 * Eoptychaspis
 * Eowuhuia
 * Euptychaspis
 * Idiomesus
 * Kathleenella
 * Keithia
 * Keithiella
 * Macronoda
 * Plectrella
 * Proricephalus
 * Ptychaspis
 * Saukioides
 * Sunwaptia
 * Wilcoxaspis