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Actinopteri - Nematognathii
It was reranked as the order Nematognathi by Hay (1902); it was reranked as the order Nematognathii by Jordan (1963).
It was assigned to Pisces by Cope (1891); to Actinopteri by Hay (1902); to Actinopterygii by Lambe (1908); and to Ostariophysi by Jordan (1963).
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.