#osteostracan__cephalaspid extinct jawless fish of the Devonian with armored head 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_Osteostraci__Osteostraci__Cephalaspida__suborder_Cephalaspida extinct group of armored fishlike vertebrates; 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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