Children (12 direct children, 605 direct and indirect children):
Notonectidae
(tree size 105)
Backswimmers
Gelastocoroidea
(tree size 68)
Naucoroidea
(tree size 162)
Nepoidea
(tree size 78)
Notonectoidea
(tree size 34)
Belostomatidae
(tree size 66)
Giant water bugs
Aphelocheiroidea
(tree size 5)
Corixoidea
(tree size 2)
Mesovelioidea
(tree size 73)
Water treader
Ochteroidea
Pseudonerthridae
Morrisonnepa