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Chondrichthyes - Plagiostomi
It was reranked as the order Plagiostomi by Leidy (1873) and Gadow (1898); it was reranked as the subclass Plagiostomata by Hay (1902); it was reranked as the class Plagiostomi by Gunnell (1933).
It was assigned to Elasmobranchii by Gadow (1898); to Elasmobranchii by Leidy (1873) and Hay (1902); and to Vertebrata by Gunnell (1933).
If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.