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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.[1]

Nephrozoa
Temporal range: Ediacaran - Present, 555–0 Ma
Animal diversity October 2007.jpg
Diversity of nephrozoans
Scientific classification edit
Kingdom: Animalia
Clade: Bilateria
Clade: Nephrozoa
Jondelius et al. , 2002
Phyla
Synonyms

Eubilateria Peter Ax, 1987

Chordates (which include all the vertebrates) are deuterostomes.[2] It seems very likely that the 555 million year old Kimberella was a member of the protostomes.[3][4] If so, this means that the protostome and deuterostome lineages must have split some time before Kimberella appeared — at least 558 million years ago, and hence well before the start of the Cambrian 541 million years ago.[2]

NotesEdit

  1. ^ Cannon, Johanna Taylor; Vellutini, Bruno Cossermelli; Smith, Julian; Ronquist, Fredrik; Jondelius, Ulf; Hejnol, Andreas (2016). "Xenacoelomorpha is the sister group to Nephrozoa". Nature. 530 (7588): 89–93. doi:10.1038/nature16520.
  2. ^ a b Erwin, Douglas H.; Eric H. Davidson (1 July 2002). "The last common bilaterian ancestor". Development. 129 (13): 3021–3032. PMID 12070079.
  3. ^ New data on Kimberella, the Vendian mollusc-like organism (White sea region, Russia): palaeoecological and evolutionary implications (2007), "Fedonkin, M.A.; Simonetta, A; Ivantsov, A.Y.", in Vickers-Rich, Patricia; Komarower, Patricia, The Rise and Fall of the Ediacaran Biota, Special publications, 286, London: Geological Society, pp. 157–179, doi:10.1144/SP286.12, ISBN 9781862392335, OCLC 156823511
  4. ^ Butterfield, N.J. (December 2006). "Hooking some stem-group "worms": fossil lophotrochozoans in the Burgess Shale". BioEssays. 28 (12): 1161–6. doi:10.1002/bies.20507. PMID 17120226.

ReferencesEdit

  Data related to Nephrozoa at Wikispecies