#superclass_Agnatha__Agnatha  superclass of eel-shaped chordates lacking jaws and pelvic fins: lampreys; hagfishes; some extinct forms
  supertype:  #class__clas  (biology) a taxonomic group containing one or more orders
  member of:  #subphylum_Vertebrata
  member:  #jawless_vertebrate__jawlessvertebrate__jawless_fish__jawlessfish__agnathan  eel-shaped vertebrate without jaws or paired appendages including the cyclostomes and some extinct forms
  member:  #order_Ostracodermi__Ostracodermi  extinct group of armored jawless vertebrates; taxonomy is not clear
     member:  #ostracoderm  extinct fishlike jawless vertebrate having a heavily armored body; of the Paleozoic
     member:  #suborder_Heterostraci__Heterostraci  extinct group of armored jawless fishes or fishlike vertebrate; taxonomy is not clear
        member:  #heterostracan  extinct jawless fish with the anterior part of the body covered with bony plates; of the Silurian and Devonian
     member:  #suborder_Osteostraci__Osteostraci__Cephalaspida__suborder_Cephalaspida  extinct group of armored fishlike vertebrates; taxonomy is not clear
        member:  #osteostracan__cephalaspid  extinct jawless fish of the Devonian with armored head
  member:  #order_Anaspida__Anaspida  extinct order of jawless vertebrates
     member:  #anaspid  extinct small freshwater jawless fish usually having a heterocercal tail and an armored head; of the Silurian and Devonian
  member:  #order_Conodonta__Conodonta__Conodontophorida__order_Conodontophorida  extinct order of primitive vertebrates; the precise taxonomy is not clear; in some classifications considered a separate phylum
     member:  #conodont  small (2 in) extinct eellike fish with a finned tail and a notochord and having cone-shaped teeth containing cellular bone; late Cambrian to late Triassic; possible predecessor of the cyclostomes
  member:  #order_Cyclostomata__Cyclostomata  primitive jawless aquatic vertebrate: lampreys; hagfishes
     member:  #cyclostome  primitive aquatic vertebrate
     member:  #suborder_Petromyzoniformes__Petromyzoniformes__Hyperoartia__suborder_Hyperoartia  lampreys as distinguished from hagfishes
     member:  #family_Petromyzontidae__Petromyzontidae  lampreys
        member:  #lamprey_eel__lampreyeel__lamprey__lamper_eel  primitive eellike freshwater or anadromous cyclostome having round sucking mouth with a rasping tongue
        member:  #genus_Petromyzon__Petromyzon  typical lampreys
           member:  #sea_lamprey__sealamprey__Petromyzon_marinus  large anadromous lamprey sometimes used as food; destructive of native fish fauna in the Great Lakes
     member:  #suborder_Myxiniformes__Myxiniformes__Hyperotreta__suborder_Hyperotreta__Myxinoidei__Myxinoidea__suborder_Myxinoidei  hagfishes as distinguished from lampreys
     member:  #family_Myxinidae__Myxinidae  slime-producing marine animals: hagfishes
        member:  #hagfish__slime_eels  eellike cyclostome having a tongue with horny teeth in a round mouth surrounded by eight tentacles; feeds on dead or trapped fishes by boring into their bodies
        member:  #genus_Myxine__Myxine  type genus of the Myxinidae (typical hagfishes)
           member:  #Myxine_glutinosa  typical hagfish
        member:  #genus_Eptatretus  a genus of fossil fish of the family Myxinidae
           member:  #eptatretus  a fossil hagfish of the genus Eptatretus
        member:  #genus_Myxinikela__Myxinikela  fossil hagfishes
           member:  #Myxinikela_siroka  fossil hagfish of the Pennsylvanian period (c. 300 million years ago) that resembled modern hagfishes

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