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Nemipteridae (threadfin bream; subclass Actinopterygii, order Perciformes) A family of marine fish that have a compressed and slender body, somewhat produced snout, and a single, continuous dorsal fin. The pelvic fins are situated just behind the pectorals. The forked tail fin may show a trailing filament off the upper lobe in some species. Nemipteridae are distributed throughout the Indo-Pacific region. There are many species.