#class_Placodermi__Placodermi  extinct group of bony-plated fishes with primitive jaws
  supertype:  class__clas  (biology) a taxonomic group containing one or more orders
  member of:  subphylum_Vertebrata
  member:  placoderm  fishlike vertebrate with bony plates on head and upper body; dominant in seas and rivers during the Devonian; considered the earliest vertebrate with jaws

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