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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..

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..

Spiracle :: Spiracle (n.) A tubular orifice communicating with the gill cavity of certain ganoid and all elasmobranch fishes. It is the modified first gill cleft.

Rhomboganoidei :: Rhomboganoidei (n. pl.) Same as Ginglymodi.

Ceratodus :: Ceratodus (n.) A genus of ganoid fishes, of the order Dipnoi, first known as Mesozoic fossil fishes; but recently two living species have been discovered in Australian rivers. They have lungs so well developed that they can leave the water and breathe in air. In Australia they are called salmon and baramunda. See Dipnoi, and Archipterygium..

Coelacanth :: Coelacanth (a.) Having hollow spines, as some ganoid fishes..

Chondropterygii :: Chondropterygii (n. pl.) A group of fishes, characterized by cartilaginous fins and skeleton. It includes both ganoids (sturgeons, etc.) and selachians (sharks), but is now often restricted to the latter..

Dinichthys :: Dinichthys (n.) A genus of large extinct Devonian ganoid fishes. In some parts of Ohio remains of the Dinichthys are abundant, indicating animals twenty feet in length..

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

Amioidei :: Amioidei (n. pl.) An order of ganoid fishes of which Amia is the type. See Bowfin and Ganoidei.

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..

Cycloganoidei :: Cycloganoidei (n. pl.) An order of ganoid fishes, having cycloid scales. The bowfin (Amia calva) is a living example..

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

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..

Shovelnose :: Shovelnose (n.) A ganoid fish of the Sturgeon family (Scaphirhynchus platyrhynchus) of the Mississippi and Ohio rivers; -- called also white sturgeon.

Placoganoid :: Placoganoid (a.) Pertaining to the Placoganoidei.

Cycloganoid :: Cycloganoid (n.) One of the Cycloganoidei.

Ginglymodi :: Ginglymodi (n.) An order of ganoid fishes, including the modern gar pikes and many allied fossil forms. They have rhombic, ganoid scales, a heterocercal tail, paired fins without an axis, fulcra on the fins, and a bony skeleton, with the vertebrae convex in front and concave behind, forming a ball and socket joint. See Ganoidel..

Scale :: Scale (n.) One of the small, thin, membranous, bony or horny pieces which form the covering of many fishes and reptiles, and some mammals, belonging to the dermal part of the skeleton, or dermoskeleton. See Cycloid, Ctenoid, and Ganoid..

Dipnoi :: Dipnoi (n. pl.) A group of ganoid fishes, including the living genera Ceratodus and Lepidosiren, which present the closest approximation to the Amphibia. The air bladder acts as a lung, and the nostrils open inside the mouth. See Ceratodus, and Illustration in Appendix..

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