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|Diversity of nephrozoans|
Jondelius et al. , 2002
Eubilateria Peter Ax, 1987
Nephrozoa is a major clade of bilaterians, divided into the protostomes and the deuterostomes, containing almost all animal phyla and over a million extant species. Its sister clade is the Xenacoelomorpha. The coelom, the excretory organs, and nerve cords developed in the Nephrozoa.
Chordates (which include all the vertebrates) are deuterostomes. It seems very likely that the Kimberella was a member of the protostomes. If so, this means that the protostome and deuterostome lineages must have split some time before Kimberella appeared — at least , and hence well before the start of the Cambrian .
Data related to Nephrozoa at Wikispecies
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