Classification of Morris and Cleevely 1981

Subfm. †Helicotominae Wenz 1938
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G. †Eccyliopterus Remelé 1888
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†Eccyliopterus alatus Roemer 1876
G. †Helicotoma Salter 1859
G. †Lophonema Purdue and Miser 1916
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†Lophonema bigranosa Butts 1926
†Lophonema taneyensis Cullison 1944
Subor. Pleurotomariina Cox and Knight 1960
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Superfm. †Euomphaloidea White 1877
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Fm. †Euomphalidae White 1877
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G. †Amphiscapha Knight 1942
G. †Centrifugus Bronn 1835
G. †Cylicioscapha Yochelson 1956
G. †Elkoceras Lintz and Lohr 1958
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†Elkoceras volborthi Lintz and Lohr 1958
G. †Euomphalopsis Ulrich et al. 1931
G. †Euomphalus Sowerby 1814
G. †Leptomphalus Yochelson 1956
G. †Macluritella Kirk 1927
G. †Nevadaspira Yochelson 1971
G. †Omphalocirrus de Ryckholt 1860
G. †Phanerotinus Sowerby 1844
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†Phanerotinus cristatus Phillips 1836
G. †Philoxene Kayser 1889
G. †Planotectus Yochelson 1956
G. †Pleuronotus Hall 1879
G. †Poleumita Clarke and Ruedemann 1903
G. †Serpulospira Cossmann 1915
G. †Sinistrispira Jhaveri 1969
G. †Sinutropis Perner 1903
G. †Straparollus de Montfort 1810
G. †Woehrmannia Böhm 1895
Fm. †Helicotomidae Wenz 1938
Fm. †Omphalotrochidae Knight 1945
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G. †Babylonites Yochelson 1956
G. †Diploconula Yochelson 1956
G. †Discotropis Yochelson 1956
G. †Micromphalus Knight 1945
G. †Omphalotrochus Meek 1864
G. †Orecopia Knight 1945
Fm. †Ophiletidae Knight 1956
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G. †Barnesella Bridge and Cloud 1947
G. †Calaurops Whitfield 1886
G. †Ceratopea Ulrich 1911
G. †Dirhachopea Ulrich et al. 1931
G. †Ecculiomphalus Portlock 1843
G. †Lecanospira Butts 1926
G. †Lesueurilla Koken 1898
G. †Lytospira Koken 1896
G. †Mastigospira La Rocque 1949
G. †Odontomaria Roemer 1876
G. †Ophileta Vanuxem 1842
G. †Ophiletina Ulrich and Scofield 1897
G. †Pararaphistoma Vostokova 1955
G. †Schizopea Butts 1926