#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
  supertype:  aquatic_vertebrate__aquaticvertebrate  animal living wholly or chiefly in or on water
  member of:  class_Placodermi__Placodermi  extinct group of bony-plated fishes with primitive jaws
     member of:  subphylum_Vertebrata__Vertebrata__Craniata__subphylum_Craniata  fishes; amphibians; reptiles; birds; mammals
        member of:  phylum_Chordata__Chordata  comprises true vertebrates and animals having a notochord
           member of:  kingdom_Animalia__Animalia__animal_kingdom  taxonomic kingdom comprising all living or extinct animals

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