Classification of Erwin 1988
G. †Ceraunocochlis Knight 1931
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†Ceraunocochlis deformis Erwin 1988
†Ceraunocochlis elongata Erwin 1988
†Ceraunocochlis fulminula Knight 1931
†Ceraunocochlis kidderi Erwin 1988
†Ceraunocochlis trekensis Erwin 1988
G. †Cylindritopsis Gemmellaro 1889
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†Cylindritopsis cheilodonta Gemmellaro 1889
†Cylindritopsis conica Gemmellaro 1889
†Cylindritopsis gemmelaroi Greco 1937
†Cylindritopsis hamiltonae Erwin 1988
†Cylindritopsis inflata Gemmellaro 1889
†Cylindritopsis insolitus Chronic 1952
†Cylindritopsis minima Gemmellaro 1889
†Cylindritopsis ovalis Gemmellaro 1889
†Cylindritopsis spheroides Erwin 1988
G. †Soleniscus Meek and Worthen 1860
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†Soleniscus diminutus Erwin 1988
†Soleniscus variabilis Erwin 1988
Superfm. †Subulitacea Lindström 1884
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Fm. †Ischnoptygmidae Erwin 1988
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G. †Ischnoptygma Erwin 1988
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†Ischnoptygma archibaldi Erwin 1988
†Ischnoptygma valentinei Erwin 1988
Invalid names: Ischnoptygminae Erwin 1988 [empty]