#order_Cyclostomata__Cyclostomata  primitive jawless aquatic vertebrate: lampreys; hagfishes
  supertype:  animal_order  the order of animals
  member of:  superclass_Agnatha
  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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