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extinct fish-like jawless vertebrate having a heavily armored body; of the Paleozoic
extinct jawless fish with the anterior part of the body covered with bony plates; of the Silurian and Devonian
extinct jawless fish of the Devonian with armored head
extinct small freshwater jawless fish usually having a heterocercal tail and an armored head; of the Silurian and Devonian
small (2 inches long) 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
primitive aquatic vertebrate
lamper eel, lamprey, lamprey eel
primitive eellike freshwater or anadromous cyclostome having round sucking mouth with a rasping tongue
hag, 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
Petromyzon marinus, sea lamprey
large anadromous lamprey sometimes used as food; destructive of native fish fauna in the Great Lakes
a fossil hagfish of the genus Eptatretus
fossil hagfish of the Pennsylvanian period (c. 300 million years ago) that resembled modern hagfishes