Children (11 direct children, 11 direct and indirect children):
Quadrula quadrula aspera
Quadrula quadrula bullocki
Quadrula quadrula conjugans
Quadrula quadrula contraryensis
Quadrula quadrula forsheyi
Quadrula quadrula fragosa
Quadrula quadrula apiculata
Quadrula quadrula nobilis
Quadrula quadrula quadrula
Quadrula quadrula rumphiana
Quadrula quadrula speciosa