|
Nephrozoa is a clade of bilaterians which includes deuterostomes and protostomes. The majority of animals more complex than jellyfish and other Cnidarians are split into two groups, the protostomes and deuterostomes. 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 .〔 == References == * ; 1998: (One or three Cambrian radiations? ) ''Science'', 280: 397-398. * ; ; ; 2008: (Testing the new animal phylogeny: a phylum level molecular analysis of the animal kingdom ). ''Molecular phylogenetics and evolution'', 49: 23-31. * ; ; ; 2002: (The Nemertodermatida are basal bilaterians and not members of the Platyhelminthes ). ''Zoologica scripta'', 31: 201-215. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Nephrozoa」の詳細全文を読む スポンサード リンク
|