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using additional techniques (multivariate analysis?). The <br />study has resulted in somewhat different interpretations of <br />-_'-_- Gila River basin Gila taxonomy than that of Rinne's <br />(Demarais, per. comm.) but details are not at hand at this <br />time. <br />1986. Kaeding, L.R., B.D. Burdick, P.A. Schrader, and W.R. <br />Noonan. Recent capture of a bonytail (Gila elegans) and <br />observations on this nearly extinct cyprinid from the <br />Colorado River. Copeia 1986:1021-1023. <br />Discusses problems in identifying a probable G. elegans <br />specimen taken at Black Rocks on the Colorado River which <br />had some characters (snout-mouth configuration) typically <br />attributable to cypha. The consensus of several <br />investigators was that the specimen represented elegans and <br />it was speculated that these characters might be within the <br />normal variation of larger specimens of bonytail. <br />Speculates that the small number of remaining bonytails in <br />the upper Colorado will result in interbreeding with other <br />species. <br />1986. Minckley, W.L., D.A. Hendrickson and C.E. Bond. Geography <br />of western North American freshwater fishes: description and <br />relationships to intracontinental tectonism; pp. 519-614, <br />in: C.H. Hocutt & E.O. Wiley, eds., Zoogeography of North <br />American freshwater fishes. Wiley-Interscience, New York. <br />866 p. <br />Not a taxonomic treatment but analyzes tectonic history and <br />its implications to the evolutionary history of Gila spp. <br />and other fishes found in the Colorado and surrounding <br />basins. <br />1988. Colorado River Fishes Recovery Team. Bonytail chub (Gila <br />elegans) revised recovery plan (draft). U.S. Fish & Wildlf. <br />Serv., Denver. 41 p. <br />Provides a relatively detailed description of bonytail <br />morphology and a brief treatment of taxonomic history. Also <br />discusses at length characters for discerning G. elegans <br />from other chub species. Addresses the need for a thorough <br />taxonomic study to clarify the status of elegans relative to <br />other species because the significance of seemingly <br />intermediate morphology in some individuals is not <br />understood. Also suggests that the possibility of <br />polymorphism in the complex should be investigated. <br />1988. Colorado River Fishes Recovery Team. Humpback chub <br />(Gila cypha) recovery plan (draft). U.S. Fish & Wildlf. <br />Serv, Denver. 37 p. <br />19