Classification of the genus Ptychagnostus
G. †Ptychagnostus Jaekel 1909
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Subg. †Ptychagnostus (Ptychagnostus) Jaekel 1909
†Ptychagnostus acidusus Opik 1979
†Ptychagnostus affinis Brøgger 1878
†Ptychagnostus akanthodes Robison 1964
†Ptychagnostus aksayensis Ergaliev and Ergaliev 2008
†Ptychagnostus atavus Tullberg 1880
†Ptychagnostus convexus Westergard 1946
†Ptychagnostus cuyanus Rusconi 1948
†Ptychagnostus intermedius Tullberg 1880
†Ptychagnostus karatauensis Ergaliev 1980
†Ptychagnostus punctuosus Angelin 1851
†Ptychagnostus richmondensis Walcott 1884
†Ptychagnostus seminula Whitehouse 1939
†Ptychagnostus sinicus Lu 1957
†Ptychagnostus spinosus Ergaliev 1980
Invalid names: Aristarius Öpik 1979 [synonym], Canotagnostus Rusconi 1951 [synonym], Zeteagnostus Opik 1979 [synonym]