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any member of the superorder Osteoglossomorpha, a group of morphologically and biologically diverse primitive fishes primarily found in freshwaters, although a few species enter slightly brackish water. Their relationship with other teleosts (i.e., advanced bony fishes) is obscure; they probably were an early offshoot from the basal teleost stock. Osteoglossomorpha comprises six extant families and about 150 species. Although the group is of little importance to man, in parts of Africa, Asia, and South America certain osteoglossomorph species are sometimes sought commercially as food fishes