#jawless_vertebrate__jawlessvertebrate__jawless_fish__jawlessfish__agnathan  eel-shaped vertebrate without jaws or paired appendages including the cyclostomes and some extinct forms
  supertype:  #aquatic_vertebrate__aquaticvertebrate  animal living wholly or chiefly in or on water
  member of:  #superclass_Agnatha
  subtype:  #ostracoderm  extinct fishlike jawless vertebrate having a heavily armored body; of the Paleozoic
  subtype:  #heterostracan  extinct jawless fish with the anterior part of the body covered with bony plates; of the Silurian and Devonian
  subtype:  #osteostracan__cephalaspid  extinct jawless fish of the Devonian with armored head
  subtype:  #anaspid  extinct small freshwater jawless fish usually having a heterocercal tail and an armored head; of the Silurian and Devonian
  subtype:  #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
  subtype:  #cyclostome  primitive aquatic vertebrate
  subtype:  #lamprey_eel__lampreyeel__lamprey__lamper_eel  primitive eellike freshwater or anadromous cyclostome having round sucking mouth with a rasping tongue
     subtype:  #sea_lamprey__sealamprey__Petromyzon_marinus  large anadromous lamprey sometimes used as food; destructive of native fish fauna in the Great Lakes
  subtype:  #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
     subtype:  #Myxine_glutinosa  typical hagfish
     subtype:  #eptatretus  a fossil hagfish of the genus Eptatretus
     subtype:  #Myxinikela_siroka  fossil hagfish of the Pennsylvanian period (c. 300 million years ago) that resembled modern hagfishes

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