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Placodermi (armour-plated fish)
It was reranked as the unranked clade Placodermi by Hay (1902) and Säve-Söderbergh (1934); it was reranked as the subclass Placodermi by Bryant (1932) and Denison (1975).
It was assigned to Azygostei by Hay (1902); to Elasmobranchii by Bryant (1932); to Elasmobranchii by Säve-Söderbergh (1934); to Pisces by Denison (1975); to Gnathostomata by Dineley and Metcalf (1999); to Chordata by Sepkoski (2002); to Vertebrata by Kiessling (2004); and to Placodermiomorphi by Long (2011).
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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.