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<br />1. "Roundtail" chubs comprise a distinct lineage. <br /> <br />2. Intermediate morphs and "humpback" chubs are members of <br /> <br />the same species, morphologically distinct from "round- <br /> <br />tails" . <br /> <br />3. Hybridization between these two lineages, "roundtail" <br /> <br />and "humpback" chub, may be a rare or non-existant pheno- <br /> <br />menon. <br /> <br />4. Taxonomic status of "bony tail" chubs relative to <br /> <br />"humpback" chubs is unclear, assuming the single "bony tail" <br /> <br />morph caught at Blackrocks in 1985 aia:~qme of the 1953 <br />Horseshoe Canyon fish were "bony tail" chubs. <br /> <br />5. Most Green River collecting sites seem to be occupied <br /> <br />predominately by "humpback" chubs. <br /> <br />6. Whirlpool Canyon appears to be exclusively inhabited by <br /> <br />"roundtail" chubs (at least according to the assayed <br /> <br />collection). <br /> <br />peA resulted in the discovery of diagnostic distance measures. <br /> <br />These characters could be used in diagnostic keys or for iden- <br /> <br />tification algorithms such as DFA, once the species question is <br /> <br />more confidently understood. <br /> <br />Identifications may not require <br /> <br />direct evaluations of caudal peduncle depth or the nuchal hump. <br /> <br /> <br />Differentiation does seem to be size-dependent. Species designa- <br /> <br /> <br />tions for smaller fish on the basis of morphology remains <br /> <br /> <br />difficult, but their statuses might be determined with biochem- <br /> <br />ie'll markers. <br /> <br />Furthermore, their affiliations might be based on <br /> <br />1 5 <br />