6 Amazon River Fish
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Pisces In some categories, a superclass of the Gnathostomata (jawed chordates) comprising the fishes (contrast Tetrapoda). The entire physical body of a fish is covered with a hard, normally scaly, skin (view scales), which crosses the eye and consists of pigments and often slime glandulars. The blood circulation system is a solitary circuit with blood passing through 2 collections of capillaries, one at the gills and the various other in the physical body cells. 3 semicircular canals exist in the internal ear. The feeling of smell is particularly well developed and pressure waves are identified by the lateral-line system (view lateral-line canal). Fossils of fish go back to the Ordovician duration, 505-- 438 million years ago. There are 2 classes of modern fish: Chondrichthyes (cartilaginous fishes) and Osteichthyes (bony fishes).
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