Key to the Cypriniformes

4a. (From 3a.) A single gill opening on each side of the head; teeth on the posteriormost plaryngeal arch

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4b. (From 3a.) Two gill openings (inhalent and exhalent apertures) on each side of head; no teeth on the pharyngeal arch; mouth ventral and modified into sucking organ, no barbels

Gyrinocheilidae

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