Classification of the clade Halecostomi
Unr. Halecostomi Regan 1903
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G. †Aphanepygus Bassani 1879
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†Aphanepygus dorsalis Davis 1887
†Aphanepygus elegans Bassani 1879
Unr. Halecomorphi Cope 1872
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G. †Cipactlichthys Brito and Alvarado-Ortega 2013
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†Cipactlichthys scutatus Brito and Alvarado-Ortega 2013
Fm. †Ionoscopidae Lehman 1966
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G. †Quetzalichthys Alvarado-Ortega and Espinosa-Arrubarrena 2008
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†Quetzalichthys perrilliatae Alvarado-Ortega and Espinosa-Arrubarrena 2008
Or. †Ionoscopiformes Grande and Bemis 1998
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G. †Asialepidotus Su 1959
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Invalid names: Guizhouella Liu 2003 [synonym], Guizhoueugnathus Liu 2004 [synonym]
Fm. †Furidae Jordan 1923
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G. †Archaeosemionotus Deecke 1889
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†Archaeosemionotus connectens Deecke 1889
Invalid names: Semionotus balsami Bellotti 1857 [nomen dubium]
G. †Furo Gistl 1848
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†Furo insignis Kner 1866
†Furo normandica Wenz 1965
†Furo orthostomus Agassiz 1842
Invalid names: Eugnathus Agassiz 1839 [replaced]
Invalid names: Eugnathidae Woodward 1895 [replaced]
G. †Sanctusichthys López-Arbarello et al. 2020
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†Sanctusichthys rieteri López-Arbarello et al. 2020
Fm. †Subortichthyidae Feng et al. 2023
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G. †Allolepidotus Deecke 1889
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†Allolepidotus bellottii Rueppell 1857
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Invalid names: Allolepidotus nothosomoides Deecke 1889 [synonym], Semionotus inermis Bellotti 1857 [synonym]
Invalid names: Ophiopsidae Bartram 1975 [empty]
Or. †Ophiopsiformes Ebert 2018
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Fm. †Ophiopsiellidae Ebert 2018
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G. †Ophiopsiella Lane and Ebert 2015
G. †Teoichthys Applegate 1988
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†Teoichthys brevipina Machado et al. 2013
†Teoichthys kallistos Applegate 1988
Fm. †Ophiopsiidae Bartram 1975
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G. †Ophiopsis Agassiz 1834
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†Ophiopsis aequalis Wagner 1863
†Ophiopsis attenuata Wagner 1863
†Ophiopsis bellottii Bassani 1886
†Ophiopsis breviceps Egerton 1852
†Ophiopsis dorsalis Agassiz 1843
†Ophiopsis flesheri Agassiz 1843
†Ophiopsis guigardi Thiollière 1873
†Ophiopsis muensteri Agassiz 1834
†Ophiopsis penicillatus Agassiz 1843
†Ophiopsis procerus Agassiz 1837
†Ophiopsis tenuiserrata Agassiz 1838
Or. †Parasemionotiformes Lehmann 1966
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Fm. †Parasemionotidae Stensiö 1932
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G. †Parasemionotus Piveteau 1929
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†Parasemionotus besairiei Lehman et al. 1959
†Parasemionotus labordei Priem 1924
†Parasemionotus villaltai Beltan 1972
G. †Stensionotus Lehman 1952
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†Stensionotus dongchangensis Liu 2002
†Stensionotus intercessus Lehman 1952
G. †Watsonulus Brough 1939
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†Watsonulus eugnathoides Piveteau 1935
Invalid names: Watsonia Piveteau 1935 [replaced]
Fm. †Sinamiidae Berg 1940
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G. †Ikechaoamia Liu 1961
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†Ikechaoamia meridionalis Zhang and Zhang 1980
†Ikechaoamia orientalis Liu 1961
†Sinamiidae naga Cavin et al. 2007
Or. †Ligulelliformes Taverne 2011
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G. †Ligulella
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†Ligulella sluysi De Saint-Seine 1955
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Invalid names: Ligulella fourmarieri De Saint-Seine and Casier 1962 [synonym]