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The PEDIGREE of
Branch Bilateria


 Children:         Grade (Infrakingdom) of Coelomates   ;   Grade of Pseudocoelomata (Nematodes : Rotifers)   ;   Grade of Acoelomata (Flatworms)
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/-- Molten earth   +====> [ 31]
/-- Organic oceans
/-- Earliest life  (4100 M BC)
/-- Prokaryotes  (4000 M BC)
/-- Higher Prokaryotes  (3900 M BC)
/-- Super-Empire of Eukaryotes and Eocytes
/-- Empire of Eukaryotes  (2100 M BC)
/-- Subempire of Mitochondrial life
/-- Complex mitochondrial life
/-- Infraempire of Plants and Animals
/-- Domain of Opisthokonts (Fungi and Animals)
/-- Kingdom of Animals
/-- Subkingdom of Metazoa (Multicellular Animals)  (700? M BC)
/-- Super-branch Eumetazoa
/  
- Branch Bilateria
 

  ``3-Great Grandchild:''        Proto-Class of Jawed Fish
  ``9-Great Grandchildren:''        Infraclass [McKenna] of Placental Mammals   ;   Infraclass [Biochem] of Placental Mammals
 

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