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Ganoidei :: Ganoidei (n. pl.) One of the subclasses of fishes. They have an arterial cone and bulb, spiral intestinal valve, and the optic nerves united by a chiasma. Many of the species are covered with bony plates, or with ganoid scales; others have cycloid scales..

Paleichthyes :: Paleichthyes (n. pl.) A comprehensive division of fishes which includes the elasmobranchs and ganoids.

Pisces :: Pisces (n. pl.) The class of Vertebrata that includes the fishes. The principal divisions are Elasmobranchii, Ganoidei, and Teleostei..

Cephalaspis :: Cephalaspis (n.) A genus of fossil ganoid fishes found in the old red sandstone or Devonian formation. The head is large, and protected by a broad shield-shaped helmet prolonged behind into two lateral points..

Euganoidei :: Euganoidei (n. pl.) A group which includes the bony ganoids, as the gar pikes..

Ganocephala :: Ganocephala (n. pl.) A group of fossil amphibians allied to the labyrinthodonts, having the head defended by bony, sculptured plates, as in some ganoid fishes..

Polypteroidei :: Polypteroidei (n. pl.) A suborder of existing ganoid fishes having numerous fins along the back. The bichir, or Polypterus, is the type. See Illust. under Crossopterygian..

Placodermi :: Placodermi (n. pl.) An extinct group of fishes, supposed to be ganoids. The body and head were covered with large bony plates. See Illust. under Pterichthys, and Coccosteus..

Rhomboganoid :: Rhomboganoid (n.) A ganoid fish having rhombic enameled scales; one of the Rhomboganoidei.

Bichir :: Bichir (n.) A remarkable ganoid fish (Polypterus bichir) found in the Nile and other African rivers. See Brachioganoidei.

Hyoganoidei :: Hyoganoidei (n. pl.) A division of ganoid fishes, including the gar pikes and bowfins..

Fulcrum :: Fulcrum (n.) One of the small, spiniform scales found on the front edge of the dorsal and caudal fins of many ganoid fishes..

Holostei :: Holostei (n. pl.) An extensive division of ganoids, including the gar pike, bowfin, etc.; the bony ganoids. See Illustration in Appendix..

Lepidosiren :: Lepidosiren (n.) An eel-shaped ganoid fish of the order Dipnoi, having both gills and lungs. It inhabits the rivers of South America. The name is also applied to a related African species (Protopterus annectens). The lepidosirens grow to a length of from four to six feet. Called also doko..

Buckler :: Buckler (n.) One of the large, bony, external plates found on many ganoid fishes..

Brachioganoid :: Brachioganoid (n.) One of the Brachioganoidei.

Crossopterygii :: Crossopterygii (n. pl.) An order of ganoid fishes including among living species the bichir (Polypterus). See Brachioganoidei.

Paddlefish :: Paddlefish (n.) A large ganoid fish (Polyodon spathula) found in the rivers of the Mississippi Valley. It has a long spatula-shaped snout. Called also duck-billed cat, and spoonbill sturgeon..

Polypterus :: Polypterus (n.) An African genus of ganoid fishes including the bichir.

Lepidoganoid :: Lepidoganoid (n.) Any one of a division (Lepidoganoidei) of ganoid fishes, including those that have scales forming a coat of mail. Also used adjectively..

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