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jawless fish

Origin of jawless fish
1965-70; jaw1 + -less Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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jawless-fish in Science
jawless fish
Any of various primitive fish of the class Agnatha that lack jaws. Living jawless fish (lampreys and hagfish) have a long, cylindrical body and a cartilaginous skeleton. The numerous extinct species were often heavily armored and are among the earliest vertebrate fossils known. Jawless fish occupy an intermediate evolutionary position between primitive chordates and jawed fish. Also called agnathan. See more at cyclostome. Compare bony fish, cartilaginous fish.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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