Classification of the genus Isorthis

G. †Isorthis Kozlowski 1929
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Subg. †Isorthis (Arcualla) Walmsley and Boucot 1975
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†Isorthis (Arcualla) arcuaria Hall and Clarke 1892
†Isorthis (Arcualla) microscapha Johnson et al. 1976
Subg. †Isorthis (Isorthis) Kozlowski 1929
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Subg. †Isorthis (Ovalella) Walmsley and Boucot 1975
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†Isorthis (Ovalella) mackenziei Boucot et al. 1966
†Isorthis (Ovalella) natiscotekia Li and Copper 2006
Subg. †Isorthis (Protocortezorthis) Walmsley and Boucot 1975
†Isorthis alpha Gill 1949
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Invalid names: Cariniferella beta Gill 1949 [synonym]
†Isorthis bailyi Wright 1964
†Isorthis crassa Lindström 1861
†Isorthis estona Alichova 1953
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Invalid names: Dalmanella estona Wysogorski 1900 [synonym]
†Isorthis festiva Philip 1962
†Isorthis loveni Lindström 1861
†Isorthis mediocra Rubel 1962
†Isorthis parvulus Rybnikova 1967
†Isorthis pygmaea Dunbar 1919
†Isorthis slitensis Walmsley 1965