The Monticelliidae species, Nomimoscolex admonticellia (Woodland, 1934), comb.n., parasite of Pinirampus pirinampu (Spix, 1829) a freshwater siluriform fish, is redescribed. This species is the type of the genus Myzophorus Woodland, 1934. The authors discuss the validity of this genus and propose its suppression. Their species are transferred to Nomimoscolex (Zigobothriinae) whose diagnose is modified to include: N. admonticellia, comb.n., N. pirarara (Woodland, 1935), comb.n. and N. woodlandi (Rego, 1984), comb.n.
Proteocephalidea; Nomimoscolex admonticellia; freshwater siluriform fishes