Icthyomyzon Lampreys

Icthyomyzon spp. lampreys that occur in Arkansas. A. Icthyomyzon gagei. B. Closeup of I. gagei showing gill slit openings. C. I. castaneus. D. I. unicuspis.

labeled types of Lampreys including one on a human hand

Figures A–B by C. T. McAllister; Figure C courtesy U.S. Fish & Wildlife Service; Figure D from Creative Commons