|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
It was reranked as the phylum Urochordata by Nielsen (2012); it was reranked as the subphylum Urochordata by Brusca et al. (2016).
It was assigned to Chordata by Nielsen (2012); to Chordata by Nielsen (2012); and to Olfactores by Edgecombe et al. (2011) 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.