jawless fishes

См. также в других словарях:

• jawless fish — [jô′lis] n. any of a class (Agnatha) of fishes with a cartilaginous skeleton, an eel like body, and a circular, sucking mouth lacking jaws, consisting of the lampreys and hagfishes …   English World dictionary

• jawless — fishes lacking jaws are vastly outnumbered by jawed fishes. The living Agnatha, hagfishes and lampreys, number about 108 species. This is a paraphyletic group and, as well as lacking jaws in contrast to the jawed fishes, also lacks pectoral and… …   Dictionary of ichthyology

• fish — fishless, adj. /fish/, n., pl. (esp. collectively) fish, (esp. referring to two or more kinds or species) fishes, v. n. 1. any of various cold blooded, aquatic vertebrates, having gills, commonly fins, and typically an elongated body covered with …   Universalium

• Fish — /fish/, n. Hamilton, 1808 93, U.S. statesman: secretary of state 1869 77. * * * I Any of more than 24,000 species of cold blooded vertebrates found worldwide in fresh and salt water. Living species range from the primitive lampreys and hagfishes… …   Universalium

• muscle — muscleless, adj. muscly, adj. /mus euhl/, n., v., muscled, muscling, adj. n. 1. a tissue composed of cells or fibers, the contraction of which produces movement in the body. 2. an organ, composed of muscle tissue, that contracts to produce a… …   Universalium

• Остракодермы — Парафилетическая группа животных Doryaspis arctica и …   Википедия

• vertebrate — /verr teuh brit, brayt /, adj. 1. having vertebrae; having a backbone or spinal column. 2. belonging or pertaining to the Vertebrata (or Craniata), a subphylum of chordate animals, comprising those having a brain enclosed in a skull or cranium… …   Universalium

• Prehistoric fish — are various groups of fishes that lived before recorded history. A few, such as the coelacanth still exist today and are considered living fossils.The first fish and the first vertebrates, were the ostracoderms, which appeared in the Cambrian… …   Wikipedia

• Cephalaspidomorphi — Cephalaspidomorphs Reconstruction of Cephalaspis lyellii Scientific classification Kingdom …   Wikipedia

• endocrine system — Group of ductless glands that secrete hormones necessary for normal growth and development, reproduction, and homeostasis. The major endocrine glands are the hypothalamus, pituitary, thyroid, islets of Langerhans, adrenals, parathyroids, ovaries …   Universalium

• Craniata — For the class of brachiopods, see Craniforma. Craniata Temporal range: Early Cambrian Recent …   Wikipedia