Classification of McCune 1986
Fm. †Semionotidae Woodward 1890
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G. †Semionotus Agassiz 1832
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†Semionotus bergeri Agassiz 1833
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Invalid names: Semionotus elongatus Fraas 1861 [objective synonym], Semionotus esox Berger 1843 [synonym], Semionotus spixi Agassiz 1833 [synonym]
†Semionotus kapffi Fraas 1861
†Semionotus minor Agassiz 1833
†Semionotus normanniae Larsonneur 1964
Invalid names: Semionotus dubius Bellotti 1857 [nomen dubium], Semionotus gibbus Seebach 1866 [nomen nudum], Semionotus inermis Bellotti 1857 [nomen dubium], Semionotus leptocephalus Agassiz 1833 [nomen dubium], Semionotus metcalfi Swinnerton 1928 [nomen dubium], Semionotus nilssoni Agassiz 1837 [nomen dubium], Semionotus trotti Bellotti 1857 [nomen dubium]
Invalid names: Semionotus serratus Fraas 1861 [nomen dubium]
Cl. Actinopterygii Cope 1887 [ray-finned fish]
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Invalid names: Semionotus inornatus Henry 1876 [nomen dubium]
Fm. †Palaeoniscidae Vogt 1852
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Invalid names: Semionotus brodei Newton 1887 [nomen dubium]
Fm. †Perleididae Brough 1931
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Invalid names: Semionotus altolepis Deecke 1889 [nomen dubium]