Children (13 direct children, 109 direct and indirect children):
Mordacia
(tree size 3)
Lethenteron
(tree size 9)
Lampetra
(tree size 34)
Entosphenus
(tree size 10)
Eudontomyzon
(tree size 10)
Petromyzon
(tree size 7)
Ichthyomyzon
(tree size 7)
Caspiomyzon
(tree size 3)
Tetrapleurodon
(tree size 2)
Mordaciinae
(tree size 2)
Geotriinae
(tree size 5)
Petromyzontinae
(tree size 4)
Lampetrinae