Advanced features of teleost that does not present in all other animals
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Teleostei /tɛliːˈɒstiːaɪ/ (Greek: teleios "complete" + osteon "bone"), members of which are known as teleosts /ˈtɛliːɒsts/, is by far the largest infraclass in the class Actinopterygii, the ray-finned fishes,[a] containing 96% of all extant species of fish. Teleosts are arranged into about 40 orders and 448 families. Over 26,000 species have been described. Teleosts range from giant oarfish measuring 7.6 m (25 ft) or more, and ocean sunfish weighing over 2 t (2.0 long tons; 2.2 short tons), to the minute male anglerfish Photocorynus spiniceps, just 6.2 mm (0.24 in) long. Including not only torpedo-shaped fish built for speed, teleosts can be flattened vertically or horizontally, be elongated cylinders or take specialised shapes as in anglerfish and seahorses. Teleosts dominate the seas from pole to pole and inhabit the ocean depths, estuaries, rivers, lakes and even swamps.