Family Echinostomatidae Looss, 1899

Prionosomoides Freitas & Dobbin, 1967

Prionosomoides scalaris Freitas & Dobbin, 1967 Host and record: Phrynops hilarii (Duméril & Bibron, 1835) (C). Site of infection: esophagus.

Reference: Lombardero & Moriena (1977).