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BTChordata
 .Vertebrata
 ..Pisces
NTAcanthodii
 Chondrichthyes
 Osteichthyes
 Placodermi
RTAgnatha
 fish scales
 eggs
 ichthyoliths
 gastroliths
 Heterostraci
 otoliths
SNBefore 1981, Agnatha and Heterostraci were included as narrower terms.