Classification of the family Ptychaspididae

Fm. †Ptychaspididae Raymond 1924
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G. †Alborsella Kushan 1973
G. †Changia Sun 1924
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†Changia chinensis Sun 1924
Invalid names: Coreanocephalus Kobayashi 1935 [synonym], Quadraticephalus Sun 1925 [synonym]
G. †Eoptychaspis Nelson 1951
G. †Eowuhuia Zhang and Wang 1984
G. †Euptychaspis Ulrich 1931
G. †Idiomesus Raymond 1924
G. †Imlerella Loch and Taylor 2004
G. †Kathleenella Ludvigsen 1982
G. †Keithia Raymond 1924
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†Keithia similis Rasetti 1944
†Keithia subclavatus Billings 1860
G. †Keithiella Rasetti 1944
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†Keithiella brevis Rasetti 1944
†Keithiella cylindrica Billings 1860
†Keithiella depressa Rasetti 1944
G. †Macronoda Lochmann 1964
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†Macronoda punctata Loch et al. 1993
Invalid names: Promesus Lochman 1964 [synonym]
G. †Plectrella Ludvigsen and Westrop 1989
G. †Proricephalus Westrop 1986
G. †Ptychaspis Hall 1863
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†Ptychaspis granulosa Owen 1852
†Ptychaspis minuta Whitfield 1878
†Ptychaspis pustulosa Hall and Whitfield 1877
†Ptychaspis tuberosa Feniak 1952
Invalid names: Asioptychaspis Kobayashi 1933 [synonym]
G. †Saukioides Kobayashi 1952
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Invalid names: Jeholaspis Kobayashi 1953 [objective synonym]
G. †Sunwaptia Westrop 1986
G. †Wilcoxaspis Westrop 1986