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Carlson, Clarence A

The cyprinid genus Gila includes three historically sympatric species endemic to the Colorado River Drainage, i.e., G. robusta (roundtail chub), G. cypha (humpback chub) and G. elegans (bonytail). Roundtail chub are locally common and widely distributed throughout the Colorado River System, whereas humpback chub and bonytail are presently rare and have extremely restricted distributions (Behnke and Benson, Coop. Ext. Serv. Bull. 503A, Colorado State Univ., 1983; Lee et al., Atlas of North American freshwater fishes, North Carolina State Mus. Nat. Hist., Raleigh, 1980; Tyus et al., pp. 12-70 in Fishes of the Upper Colorado River System: present and future [W. H. Miller, H. M. Tyus, and C. A. Carlson, eds.], Am. Fish....
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