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<br /> <br /> <br />Frontispiece. Yearling razorback sucker (Xyrauchen texanus). Top - interneural bones of cleared and <br />stained specimen, 65 mm TL. Bottom - predorsal keel barely evident immediately behind the head of a living <br />specimen, 85 mm TL. Reared by the Larval Fish Laboratory from eggs artificially fertilized on June 8, 1980, <br />from adults collected in gravel pits connected to the Colorado River near Clifton, Colorado. <br /> <br />x <br /> <br />1 <br />