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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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