Children (19 direct children, 19 direct and indirect children):
Hydrometra stagnorum
Hydrometra aemula
Hydrometra barei
Hydrometra australis
Hydrometra beameri
Hydrometra consimilis
Hydrometra gracilenta
Hydrometra hungerfordi
Hydrometra lillianis
Hydrometra martini
Hydrometra wileyae
Hydrometra albolineata
Hydrometra adnexa
Hydrometra cherukolensis
Hydrometra fruhstoferi
Hydrometra nicobarensis
Hydrometra strigosa
Hydrometra servillei
Hydrometra aequatoriana