Children (16 direct children, 16 direct and indirect children):
Hydatina physis
Hydatina albocincta
Hydatina zonata
Hydatina exquisita
Hydatina fasciata
Hydatina montillai
Hydatina vesicaria
Hydatina amplustre
Hydatina filosa
Hydatina stroemfeldi
Hydatina velum
Hydatina verrilli
Hydatina vexillum
Hydatina cinctoria
Hydatina exigua
Hydatina eximia