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Key to the Cypriniformes
5a. (From 4a.) More than 16 teeth in a single row on the pharyngeal arch; lips usually thick and fleshy, with abundant plicae or papillae; upper jaw usually bordered by both premaxilla and maxilla; never with spine-like modified rays in fins
5b. (From 4a.) Less than eight teeth in from one to four rows on the pharyngeal arch; lips usually thin, not with plicae or papillae; upper jaw usually bordered only by premaxilla; some taxa with spine-like elements (modified rays) in median fins
