Classification of Landing et al. 2002

G. †Lapworthella Cobbold 1921
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†Lapworthella schodakensis Lochman 1956
G. †Coleoloides Walcott 1890
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†Coleoloides prindlei Lochman 1956
†Coleoloides typicalis Walcott 1890
G. †Hyolithellus Billings 1872
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†Hyolithellus micans Billings 1871
G. †Hyolithes d'Eichwald 1840
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†Hyolithes americanum Hall 1847
G. †Asperconella Landing and Bartowski 1996
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†Asperconella troyensis Resser 1938
G. †Stenotheca Hicks 1872
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†Stenotheca taconica Landing and Bartowski 1996
G. †Mackinnonia Bengtson et al. 1990
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†Mackinnonia obliqua Landing and Bartowski 1996
Or. †Orthocerida Kuhn 1940
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G. †Insolutotheca Landing and Bartowski 1996
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†Insolutotheca communis Billings 1872
G. †Fordilla Barrande 1881
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†Fordilla troyensis Barrande 1881
G. †Bicella Cooper 1989
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†Bicella bicensis Resser 1938
Or. †Acrotretida Kuhn 1949
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Superfm. †Acrotretoidea Schuchert 1893
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Fm. †Acrotretidae Schuchert 1893
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Invalid names: Linnarssoniinae Rowell 1965 [empty]
Or. †Helcionellida Geyer 1994
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Fm. †Helcionellidae Wenz 1938
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G. †Mellopegma Runnegar and Jell 1976
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†Mellopegma georginensis Runnegar and Jell 1976
Superfm. †Pelagielloidea Knight 1956
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Fm. †Pelagiellidae Knight 1952
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G. †Pelagiella Matthew 1895
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†Pelagiella atlantoides Mathews 1894
†Pelagiella primaeva Billings 1872
Fm. †Yochelcionellidae Runnegar and Jell 1976
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G. †Yochelcionella Runnegar and Pojeta 1974
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†Yochelcionella cyrano Runnegar and Pojeta 1974
Subor. †Eodiscina Kobayashi 1939
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Fm. †Eodiscidae Raymond 1913
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G. †Pagetia Walcott 1916
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†Pagetia bootes Walcott 1916
†Pagetia ellsi Rasetti 1945
G. †Pagetides Rasetti 1945
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†Pagetides elegans Rasetti 1945
Subor. †Agnostina Salter 1864
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G. †Archaeagnostus Kobayashi 1939
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†Archaeagnostus primigneus Kobayashi 1939
Or. †Pseudoconodontida Landing 1995
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G. †Mongolitubulus Missarzhevsky 1977
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†Mongolitubulus squamifer Missarzhevsky 1977