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|Noun||1.||class Placodermi - extinct group of bony-plated fishes with primitive jaws|
Craniata, subphylum Craniata, subphylum Vertebrata, Vertebrata - fishes; amphibians; reptiles; birds; mammals
placoderm - fish-like vertebrate with bony plates on head and upper body; dominant in seas and rivers during the Devonian; considered the earliest vertebrate with jaws
class - (biology) a taxonomic group containing one or more orders