Children (13 direct children, 407 direct and indirect children):
Physa
(tree size 225)
Aplexa
(tree size 38)
Physella
(tree size 63)
Stenophysa
(tree size 6)
Archiphysa
(tree size 6)
Caribnauta
(tree size 1)
Sibirenauta
(tree size 5)
Physinae
(tree size 11)
Aplexinae
(tree size 32)
Haitia
(tree size 7)
Berellaia
Hannibalina
Petrophysa