Classification of the family Cyrtonellidae
Fm. †Cyrtonellidae Knight and Yochelson 1958
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G. †Isospira Koken 1897
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†Isospira bucanioides Koken 1897
†Isospira huttoni Reed 1921
†Isospira lepida Perner 1903
†Isospira nautilina Koken and Perner 1925
†Isospira reinwaldti Öpik 1930
†Isospira reticulata Wängberg-Eriksson 1964
Invalid names: Isospiridae Wängberg-Eriksson 1964 [synonym]