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.

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