Children (14 direct children, 6353 direct and indirect children):
Trachylinae
(tree size 372)
Hydroidolina
(tree size 5832)
Hydroid subclass
Hydroida
(tree size 31)
Chondrophora
Eoporpita
Velumbrella
Protulophila
(tree size 1)
Laingiomedusae
(tree size 1)
Limnopolypae
Leptolinae
(tree size 100)
Chondrophorina
(tree size 1)
Spongiomorphida
(tree size 1)
Sphaeractinida
Trachylinida