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<br />4. <br /> <br />Tyus, H. M., and C. A. Karp. 1990. Spawning and movements of razorback sucker, <br />Xyrauchen texanus, in the Green River basin of Colorado and Utah. <br />Southwestern Naturalist 35:427-433. <br /> <br />USFWS (U.S. Fish and Wildlife Service). 1991. Endangered and threatened wildlife <br />and plants; the razorback sucker (Xyrauchen texanus) determined to be an <br />endangered species. Final Rule. Federal Register 56 (23 October <br />1991 ):54957-54967. <br /> <br />11 <br />