|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
It was reranked as the unranked clade Chordata by Nielsen (2012).
It was assigned to Metazoa by Shoshani et al. (1989) and Sepkoski (2002); and to Deuterostomia by Zrzavy et al. (1998), Edgecombe et al. (2011), Nielsen (2012) and Brusca et al. (2016).
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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.