|Basic info||Taxonomic history||Classification||Included Taxa|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
It was synonymized subjectively with Leptocardia by Jaekel (1911); 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), Brusca et al. (2016) and Nelson 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), Brusca et al. (2016) and Nelson et al. (2016).
|Year||Name and author|
|1998||Cephalochordata Zrzavy et al.|
|1999||Cephalochordata Dineley and Metcalf p. 11|
|2011||Cephalochordata Edgecombe et al. p. 153 figs. Fig. 1|
|2012||Cephalochordata Nielsen p. 358|
|2016||Cephalochordata Brusca et al.|
|2016||Cephalochordata Nelson et al. p. 15|
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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.