Children (13 direct children, 13 direct and indirect children):
Tethys fimbria
Tethys dominguensis
Tethys occidentalis
Tethys capensis
Tethys elegans
Tethys floridensis
Tethys hirasei
Tethys modesta
Tethys panamensis
Tethys peasei
Tethys pilsbryi
Tethys pulmonica
Tethys willcoxi