1	Ceca do not surpass the anterior margin of the testes	2
–	Ceca surpass the anterior margin of the testes	4
2	Anterior margin of the vitelline follicles does not reach the anterior margin of the pharynx	Paracreptotrema heterandriae
–	Anterior margin of the vitelline follicles surpasses the anterior margin of the pharynx	3
3	Uterus extends to the posterior margin of the hindbody	Paracreptotrema mendezi
–	Uterus does not extend to the posterior margin of the hindbody	Paracreptotrema rosenthali
4	Vitellarium extends posterior to the testes	Paracreptotrema profundulusi
–	Vitellarium does not extend into the region posterior to the testes	Paracreptotrema blancoi