Selachii The major subclass of the Chondrichthyes (cartilaginous fishes), containing the sharks, rays, skates, and similar but extinct forms. Their sharp teeth develop from the toothlike placoid scales (denticles) and are rapidly replaced as they wear out.
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Actinopterygians , Holostei Group of marine and fresh water bony fish including many fossil species, e.g. Lepidotes (Triassic—Cretaceous), and Dapedius (Jurassic). Holo… Scale (zoology) , scales The small bony or horny plates forming the body covering of fish and reptiles. The wings of some insects, notably the Lepidoptera (butterflies… Cartilaginous Fishes , The class Chondrichthyes consists of the cartilaginous fishes, including sharks, batoids (rays, skates, guitarfish, and sawfishes), and chimaeras, or… Teleosts , Teleostei (teleost, teleostean) Somewhat loosely defined term (an infraclass or super-order according to some authors) that includes all the living b… Heterocercal Tail , Skip to main content heterocercal tail heterocercal tail In fish, a tail in which the tip of the vertebral column turns upward, extending into the do… Elasmobranchs , Elasmobranchii Subclass of shark-like fish. They have 5–7 gill slits, fairly rigid fins, placoid scales, a spiracular opening behind the jaws, numero…
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