Children (7 direct children, 7 direct and indirect children):
Ichthyomyzon fossor
Northern brook lamprey
Ichthyomyzon greeleyi
Mountain brook lamprey
Ichthyomyzon bdellium
Ohio lamprey
Ichthyomyzon gagei
Southern brook lamprey
Ichthyomyzon castaneus
Chestnut lamprey
Ichthyomyzon unicuspis
Silver lamprey
Ichthyomyzon hirudo