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Number of Classes in Chordata: 14

Chordata
 
Actinopterygii [43,282] Amphibia [3,472] Ascidiacea [803] Aves [14,907] Cephalaspidomorphi [301] Cephalochordata [249] Elasmobranchii [5,385] Holocephali [173] Mammalia [25,897] Myxini [91] Reptilia [2,364] Sarcopterygii [21] Thaliacea [3] unknown [244]
Developed by
Chinese Academy of Sciences
International DNA Barcode of Life Project