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Polypterus senegalus
The Senegal bichir (''Polypterus senegalus'') also known as the gray bichir and Cuvier's bichir, is sometimes called the "dinosaur eel" (a misnomer, as the creature is not an eel nor a dinosaur) or "dragon fish" in the pet trade. It is a prototypical species of fish in the ''Polypterus'' genus, meaning most of its features are held across the genus. Commonly kept in captivity by hobbyists. They are native from Africa where they are the most widespread species of the genus.
==Appearance==
An elongated fish, usually grey or beige in color, it sometimes has shades of white, pink or blue on some scales; most of the fish is covered in very subtle patterns with occasional darker blotches or dots. The face is smooth and rounded at the nose with larger scales than the rest of the fish, external nostrils protrude from the front; eyes are on each side of the head, they are usually pale yellow with a black pupil; the mouth is large and seems to grin when closed. The body is long and vaguely cylindrical; a serrated dorsal fin runs along most of the body until it meets the caudal fin which is pointed and flat. The pectoral fins attach just behind and below the gill openings, and are the primary means of locomotion, providing a slow, graceful appearance. ''P. senegalus'' is smaller than other bichirs, reaching about 35.5 cm (14 in).
The fish has a pair of primitive lungs instead of a swim bladder, allowing it to periodically gulp air from the surface of the water. In the aquarium, bichirs can be observed dashing to the surface for this purpose.
This bichir's skin serves as a particularly effective armor, and has been studied as a model for personal armor for better combinations of protection and mobility.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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