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Pteraspidomorpha - Cyathaspidiformes - Pteraspididae
It was corrected as Pteraspidae by Bryant (1932); it was misspelled as Pteraspidae by Jordan (1963), Blieck (1984), Blieck et al. (2002) and Dumbrava and Blieck (2005).
It was assigned to Heterostraci by Woodward (1891), Hay (1902), Bryant (1932) and Jordan (1963); to Pteraspidida by Blieck et al. (2002); and to Pteraspidiformes by Blieck (1984) and Dumbrava and Blieck (2005).
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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.