Children (6 direct children, 50 direct and indirect children):
Tetrahymenidae
(tree size 4)
Tetrahymenina
(tree size 22)
Ichthyophthiriidae
(tree size 2)
Hymenostomatida
(tree size 1)
Hymenostome
Ophryoglenida
(tree size 7)
Tetrahymenida
(tree size 8)