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It was reranked as the class Polychaeta by Martin (1904); it was misspelled as Polychaetia by Squires (1984), Barnes (1998), Zrzavy et al. (1998) and Sepkoski (2002).
It was assigned to Chaetopoda by Martin (1904); and to Annelida by Squires (1984), Barnes (1998), Zrzavy et al. (1998) and Sepkoski (2002).
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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.