Children (13 direct children, 13 direct and indirect children):
Heterocyathus hemisphaericus
Heterocyathus japonicus
Heterocyathus sulcatus
Heterocyathus alternatus
Heterocyathus aequicostatus
Heterocyathus antoniae
Heterocyathus oblongatus
Heterocyathus pulchellus
Heterocyathus japonica
Heterocyathus elberti
Heterocyathus heterocostatus
Heterocyathus parasiticus
Heterocyathus philippinensis