Classification of Gess et al. 2006
Unr. Hyperoartia Müller 1844
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Or. Petromyzontiformes Berg 1940 [lamprey]
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G. †Euphanerops Woodward 1900
G. †Mayomyzon Bardack and Zangerl 1968
G. †Mesomyzon Chang et al. 2006