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Cypriniformes (subclass Actinopterygii, superorder Ostariophysi) An order of carp-like fish. Typical freshwater inhabitants, the fins lack proper spines, the single dorsal fin is usually half-way down the back opposite the ventral fins in the abdominal position, and an adipose fin is present in some families. The order includes some 26 families, e.g. the Characidae (tetras), the Cyprinidae (carps), and the Catostomidae (suckers).