|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
It was reranked as the unranked clade Cephalochordata by Zhang (2011) and Nielsen (2012); it was reranked as the phylum Cephalochordata by Nielsen (2012); it was reranked as the subphylum Cephalochordata by Dineley and Metcalf (1999) and Brusca et al. (2016).
It was assigned to Metazoa by Zhang (2011); to Chordata by Nielsen (2012); and to Chordata by Zrzavy et al. (1998), Dineley and Metcalf (1999), Sepkoski (2002), Edgecombe et al. (2011), Nielsen (2012) and Brusca et al. (2016).
|Year||Name and author|
|1998||Cephalochordata Zrzavy et al.|
|1999||Cephalochordata Dineley and Metcalf p. 11|
|2002||Cephalochordata Sepkoski, Jr.|
|2011||Cephalochordata Edgecombe et al. p. 153 figs. Fig. 1|
|2012||Cephalochordata Nielsen p. 358|
|2016||Cephalochordata Brusca et al.|
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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.