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Chondrichthyes Euteleostomi Petromyzontiformes Cephalochordata Hemichordata Asteroidea Echinoidea Crinoidea Hexapoda Malacostraca Branchiopoda Chilopoda Chelicerata Mollusca Annelida Brachiopoda Platyhelminthes Cnidaria
0 300 600 900 1250 Time (MYA)
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