Classification of Hampton 1958
Cl. Holothuroidea de Blainville 1834 [sea cucumber]
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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) brownwoodensis Croneis and McCormack 1932
†Achistrum (Achistrum) ludwigi Croneis and McCormack 1932
†Achistrum (Achistrum) nicholsoni Etheridge 1881
†Achistrum (Achistrum) triassicum Frizzell and Exline 1955
Subg. †Achistrum (Cancellrum) Hampton 1958
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†Achistrum (Cancellrum) gamma Hodson et al. 1956
†Achistrum (Cancellrum) monochordata Hodson et al. 1956
Subg. †Achistrum (Spinrum) Hampton 1958
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†Achistrum (Spinrum) bartensteini Frizzell and Exline 1955