Trilobita - Asaphida - Ptychaspididae

Parent taxon: Ptychaspididae according to P. A. Jell and J. M. Adrain 2003

Sister taxa: Alborsella, Changia, Coreanocephalus, Euptychaspis, Idiomesus, Imlerella, Kathleenella, Keithia, Keithiella, Macronoda, Plectrella, Promesus, Proricephalus, Sunwaptia, Wilcoxaspis

Subtaxa: Ptychaspis granulosa, Ptychaspis miniscaensis, Ptychaspis subglobosa, Ptychaspis tuberosa

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Ecology: fast-moving low-level epifaunal deposit feeder