Classification of the family Delthyrididae
Fm. †Delthyrididae Waagen 1883
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Subfm. †Delthyridinae Phillips 1841
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G. †Delthyris Dalman 1828
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Subg. †Delthyris (Quadrifarius)
†Delthyris acutilirata Conrad 1842
†Delthyris consobrina dOrbigny 1867
†Delthyris elegans Muir-Wood 1925
†Delthyris elevata Dalman 1828
†Delthyris ptychodes Dalman 1828
†Delthyris pusio Hisinger 1831
†Delthyris rostrata Zieten 1830
G. †Ivanothyris
Subfm. †Howellellinae Johnson and Hou 1994
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G. †Acanthospirifer
G. †Aldanispirifer Alekseeva 1967
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†Aldanispirifer bigugosus M'Coy 1846
†Aldanispirifer helenae Alekseeva 1967
Invalid names: Holcospirifer Bassett et al. 1976 [synonym]
G. †Howellella Kozlowski 1946
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†Howellella anglica Lamont and Gilbert 1945
†Howellella crispa Hisinger 1827
†Howellella cycloptera Hall 1857
†Howellella elegans Muir-Wood 1925
†Howellella porcata Jin et al. 1993
†Howellella subinsignis Reed 1927
†Howellella textilis Talent 1963
Invalid names: Crispella Kozlowski 1929 [replaced]
G. †Howelloidea
G. †Orientospirifer
G. †Qiansispirifer
G. †Quiringites
G. †Rufispirifer
Invalid names: Kozlowskiellininae Boucot 1958 [empty]