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<br /> <br /> <br />Frontispiece. Yearling razorback suckers. Top -- interneural bones of cleared and stained specimen, 65 mm <br />total length. Bottom -- predorsal keel barely evident immediately behind the head of a living specimen, 85 mm <br />total length. Reared by the Larval Fish Laboratory from eggs artificially fertilized on June 8, 1980, from adults <br />collected in gravel pits connected to the Colorado River near Clifton, Colorado. <br /> <br />viii <br /> <br />