There are generally 210 genera and 2010 species recognized among the Cyprinidae. Species Nomenclature . The Longnose dace has a nonprotractile inferior mouth with a fleshy upper lip, with gape terminating in front of eye. Small barbels located at corner of mouth, conspicuous on adult fishes but usually hidden in skin folds. Scale type is cycloid, small with approximately 61-72 in lateral line.
Lateral line is straight or nearly so and complete.
Peritoneum is silver in appearance speckled with brown. Swim bladder not usually well developed in adults. Color of the back varies from olive-green to brown, shading to a lighter silvery white on the abdomen, dark color often not reaching ventrally from the lateral line. Dark lateral line from gill operculum to caudal base with a dark stripe above the eye often observed. Caudal peduncle is twice as long as is deep, with adult body lengths ranging from 8-13 cm in length.