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brief summary of taxonomic history. <br />1980. Holden, P.B., and W.L. Minckley. Gila robusta; p. 172, <br />in: D.S. Lee et al., Atlas of North American freshwater <br />fishes. N.C. St. Mus., Raleigh,-U.S. Fish & Wldlf. Serv. <br />854 p. <br />_ Offers primarily distributional information but includes a <br />brief summary of taxonomic history of robusta and its <br />various subspecies. <br />1980. Wydoski, R.S., K. Gilbert, K. Seethaler, C.W. McAda, et <br />al. Annotated bibliography for aquatic resource management <br />of the upper Colorado River ecosystem. U.S. Fish & Wildlf. <br />Serv. Res. Pub. 135. 186 p. <br />A comprehensive bibliography including studies of fishes and <br />some works on fish taxonomy, but with generally briefer <br />annotations than those found in Ecology Consultants, Inc. <br />(1977) which includes most of same references. <br />1981. Hamman, R.L. Hybridization of three species of chub in a <br />hatchery. Prog. Fish-Cult. 43:140-141. <br />Potential hybridity of G. robusta X G. elegans and G. <br />elegans X G. cypha was demonstrated by artificial crosses <br />in the laboratory with many surviving. However natural <br />spawning failed to occur in the captive situation. Progeny <br />from these crosses are of potential value in analyzing <br />variation in natural populations. <br />1981. Snyder, D.E. Contributions to a guide to the cypriniform <br />fish larvae of the upper Colorado River system. U.S. Bur. <br />Land Mgt. Biol. Sci. Ser. 3. 81 p. <br />Provides a key to upper Colorado larval minnows and suckers <br />with tentative characters for three Gila species but with <br />some ambiguity in each case. Gives extremely detailed <br />descriptions of larvae ascribed to G. cypha and G. robusta, <br />including meristics and measurements. Illustrates form and <br />pigmentation patterns over several growth stages. <br />1982. Hamman, R.L. Spawning and culture of humpback chub. <br />Prog. Fish-Cult. 44:213-216. <br />Mainly relates techniques used in culture but of taxonomic <br />interest because of documentation of brood stock localities <br />(Little Colorado R. and Colorado R. at Black Rocks) for <br />humpbacks used in culture which, along with offspring, could <br />conceivably be among material used in taxonomic studies. <br />13