Classification of Fletcher 1962
Fm. †Achistridae Frizzell and Exline 1955
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G. †Achistrum Etheridge 1881
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Subg. †Achistrum (Achistrum) Hampton 1958
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†Achistrum (Achistrum) issleri Croneis and McCormack 1932
Subg. †Achistrum (Aduncrum) Hampton 1958
Subg. †Achistrum (Cancellrum) Hampton 1958
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†Achistrum (Cancellrum) bichordata Fletcher 1962
†Achistrum (Cancellrum) bicordata Fletcher 1962
†Achistrum (Cancellrum) gamma Hodson et al. 1956
†Achistrum (Cancellrum) monochordata Hodson et al. 1956
†Achistrum (Cancellrum) pilgrimi Fletcher 1962
†Achistrum (Cancellrum) trichordata Fletcher 1962
Subg. †Achistrum (Spinrum) Hampton 1958