Trilobita - Asaphida - Ptychaspididae

Synonym: Quadraticephalus Sun 1925

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

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

Subtaxa: Changia chinensis

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Type: Changia chinensis

Ecology: fast-moving low-level epifaunal deposit feeder