#heterostracan  extinct jawless fish with the anterior part of the body covered with bony plates; of the Silurian and Devonian
  supertype:  #jawless_vertebrate__jawlessvertebrate__jawless_fish__jawlessfish__agnathan  eel-shaped vertebrate without jaws or paired appendages including the cyclostomes and some extinct forms
  member of:  #suborder_Heterostraci__Heterostraci  extinct group of armored jawless fishes or fishlike vertebrate; taxonomy is not clear
     member of:  #order_Ostracodermi__Ostracodermi  extinct group of armored jawless vertebrates; taxonomy is not clear
        member of:  #superclass_Agnatha__Agnatha  superclass of eel-shaped chordates lacking jaws and pelvic fins: lampreys; hagfishes; some extinct forms
           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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