Children (48 direct children, 50 direct and indirect children):
Hood ancylid
Ferrissia mcneili
Ferrissia fragilis
Fragile ancylid
Ferrissia parallela
Oblong ancylid
Ferrissia parallelus
Ferrissia dalli
Ferrissia rivularis
Ferrissia walkeri
Ferrissia hendersoni
Ferrissia tanganyicensis
Ferrissia isseli
Ferrissia clessiniana
Ferrissia gentilis
Ferrissia tenuis
Pettancylus
Ferrissia eburnensis
Ferrissia petterdi
Ferrissia dohrnianus
Ferrissia beaui
Ferrissia angustus
Ferrissia arionoides
Ferrissia baconi
Ferrissia bartschi
Ferrissia bayacalifornica
Ferrissia burnupi
Ferrissia californica
Ferrissia cawstoni
Ferrissia circus
Ferrissia connollyi
Ferrissia crenellata
Ferrissia deperdita
(tree size 2)
Ferrissia depressus
Ferrissia dimici
Ferrissia fontinalis
Ferrissia illyrica
Ferrissia irrorata
Ferrissia junodi
Ferrissia lacustris
Ferrissia michiganensis
Ferrissia neumayri
Ferrissia occidentalis
Ferrissia platyrhynchus
Ferrissia pleistocaenica
Ferrissia pontileviensis
Ferrissia sharpi
Ferrissia truci
Ferrissia verruca
Ferrissia wautieri
Ferrissia wittmanni