Chubs of the Gila River basin have been variously classified as nominal species, subspecies of Gila robusta, or a “complex.” Three full species, robusta, intermedia, and nigra are here recognized, the last possibly arising through more than one hybrization event between robusta and intermedia. Following resolution of a nomenclatural problem, G. nigra is characterized in a key for species identification. Listing under the Endangered Species Act is suggested for all species of Gila in the Colorado River basin.
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Vol. 2000 • No. 1