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name for several primitive marine and freshwater jawless fishes of the order Petromyzontiformes. As in the other jawless fish, the hagfishhagfish,
primitive, jawless marine fish of the family Myxinidae, of worldwide distribution in cold and temperate waters. Its rudimentary skeleton, of cartilage rather than bone, has a braincase, but no jaw. The circular sucking mouth has rows of horny teeth.
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, the adult lamprey retains the notochordnotochord
, in biology, supporting rod running most of the length of animals of the phylum Chordata and present at varying times in the life cycle. Composed of large cells packed within a firm connective tissue sheath, the notochord lies between the neural tube (spinal cord) and
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, the supporting structure that in higher vertebrates is found only in the embryo. An ancient fish that still resembles fossils that are 360 million years old, the lamprey lacks a sympathetic nervous system, a spleen, and scales.

The adult lampreys of some species are parasitic, sucking the blood of other fishes. The horny teeth, set in the circular, jawless mouth, attach to the prey and the lamprey feeds as it is carried along. Lampreys have an anticoagulant in the saliva that keeps the blood of the victim fluid. The parasitic sea, or Atlantic, lamprey, Petromyzon marinus, found on both sides of the Atlantic, has become well established in the Great Lakes, where it is considered a serious pest by the fishing industry. Many freshwater lampreys are not parasitic.

Lampreys resemble eelseel,
common name for any fish in the order Anguilliformes, and characterized by a long snakelike body covered with minute scales embedded in the skin. Eels lack the hind pair of fins, adapting them for wriggling in the mud and through the crevices of reefs and rocky shores.
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 in external appearance and, although not related to the true eels, are sometimes called lamprey eels. When not attached to prey, they swim with undulating movements. The marine lampreys normally migrate into freshwater to spawn, and some populations have become landlocked in freshwater.

The sexes are separate in lampreys and fertilization is external. The parents die shortly after the eggs are deposited in a nest. The larvae, called ammocoetes, are about 1-4 in. (6 mm) long. They are transparent, eyeless filter-feeders and live in muddy river bottoms, eating particles of organic matter. Ammocoetes are used in zoology courses to demonstrate a theoretically primitive vertebrate construction. At about five years of age they metamorphose into the adult form. In some species the adult does not feed and remains the size of the larva.

Lampreys are classified in the phylum ChordataChordata
, phylum of animals having a notochord, or dorsal stiffening rod, as the chief internal skeletal support at some stage of their development. Most chordates are vertebrates (animals with backbones), but the phylum also includes some small marine invertebrate animals.
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, subphylum Vertebrata, class Hyperoartia, order Petromyzontiformes.

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(vertebrate zoology)
The common name for all members of the order Petromyzonida.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.


any eel-like cyclostome vertebrate of the family Petromyzonidae, having a round sucking mouth for clinging to and feeding on the blood of other animals
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
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They're taking advantage of times the Lamprey River flows at high levels and banking that water for a time when the town and the university need it the most.
We assessed the theoretical influences of carcass nutrients on larval sea lamprey, with the assumption that growth and subsequent metamorphosis of larvae are linked to freshwater productivity.
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Before experiments, animals (n = 57) were deeply anesthetized by immersion in lamprey Ringer solution containing 0.1% tricaine methanesulfonate (ScienceLab, Houston, TX, USA).
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A putative juvenile (recently metamorphosed) River Lamprey was collected at the John Day Dam smolt bypass facility on 28 May 2013 from a sample time frame of 13:00 to 07:00.
Lethenteron appendix: The American brook lamprey, a non-parasitic species, is considered to be common in Indiana and occurs in both the northern and southern portions of the state (Simon 2011).
But the away side ensured victory with a try from Lamprey after the Tigers' scrum did the damage.
The Oregon Department of Fish and Wildlife says they have put a lamprey ramp on the Winchester Dam.
Lamprey ensured the deficit remained at two when she produced a great near post save from a Catherine Walsh strike.