Classification of Cuny and Stemmerik 2018
Or. †Symmoriiformes Zangerl 1981
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G. †Stemmatias Hay 1899
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†Stemmatias simplex St John and Worthen 1875
Invalid names: Gunnellodus Wilimovksy 1954 [synonym]
Subcl. †Euchondrocephali Lund and Grogan 1997
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Infracl. †Xenacanthimorpha
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Fm. †Jalodontidae Ginter et al. 2002
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