IchthyomyzonIchthyomyzon is a genus of lampreys in the family Petromyzontidae, native to North America.SpeciesThere are currently six recognized species in this genus:Ichthyomyzon bdellium Ichthyomyzon castaneus Girard, 1858 Ichthyomyzon fossor Reighard & Cummins, 1916 Ichthyomyzon gagei C. L. Hubbs & Trautman, 1937 Ichthyomyzon greeleyi C. L. Hubbs & Trautman, 1937 Ichthyomyzon unicuspis C. L. Hubbs & Trautman, 1937