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It was reranked as the superorder Crossopterygia by Cope (1887); it was reranked as the order Crossopterygii by Woodward (1891) and Woodward (1916); it was reranked as the subclass Crossopterygii by Heintz (1934) and Jordan (1963); it was reranked as the unranked clade Crossopterygii by Säve-Söderbergh (1934); it was corrected as Crossopterygii by Daly (1973).
It was assigned to Ganoidei by Huxley (1861); to Teleostomi by Cope (1887) and Woodward (1916); to Teleostomi by Woodward (1891) and Heintz (1934); to Choanata by Säve-Söderbergh (1934); to Pisces by Jordan (1963); and to Sarcopterygii by Daly (1973).
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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.