|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
It was reranked as the phylum Annelida by Martin (1904); it was reranked as the unranked clade Annelida by Edgecombe et al. (2011).
It was assigned to Vermes by Martin (1904); to Chaetifera by Zrzavy et al. (1998); to Metazoa by Sepkoski (2002); to Eutrochozoa by Kiessling (2003); to Trochozoa by Edgecombe et al. (2011); and to Schizocoela by Nielsen (2012).
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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.