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Lethrinidae (emperor; subclass Actinopterygii, order Perciformes) A small family of marine, tropical fish that resemble the Pomadasyidae, being rather deep-bodied fish, often brightly coloured, with a continuous dorsal fin, a pronounced or pointed snout, scaleless cheeks, and strong ‘canine’ teeth in the jaws. Lethrinus chrysostomus (sweetlips emperor), 90 cm, among the largest species, is found in the Indo-Australian region. There are about 21 species, found in the Indo-Pacific region and in W. Africa.