Proterodiplostomidae is a monotypic family of trematodes in the order Diplostomida. It consists of one subfamily, Polycotylinae Monticelli, 1888,Monticelli, F. S. (1888). Saggio di una morfologia del trematodi. Tesi per ottenere la privata docenza in Zoologia nella R. Naples: Università di Napoli: Stabilimento Tipografico Fili, Ferrante. which consists of one genus, Cheloniodiplostomum Sudarikov, 1960,Sudarikov, V. E. (1960). Strigeidida: Diplostomatidae. In Skryabin, K. I. (Ed.), Trematodes of animals and man. Principles of trematodology. Moscow: Nauka. which consists of four species: Cheloniodiplostomum argentinense Palumbo & Diaz, 2018;Palumbo, E. & Diaz, J. (2018). New species and new record of the genus Cheloniodiplostomum (Trematoda: Proterodiplostomidae: Polycotylinae), parasites of freshwater turtles from Argentina. Parasitology Research, 1–7. Cheloniodiplostomum breve (MacCallum, 1921);MacCallum, G. (1926). Revue du genre Spirorchis MacCallum. Annales de Parasitologie Humaine et Comparée, 4(1), 97–103. Cheloniodiplostomum delillei (Zerecero, 1947);Zerecero, M. C. (1947). Posición sistemática de Diplostomum brevis y D. cinosterni MacCallum, 1921, y descripción de un nuevo trematodo parásito de Chelydra serpentina (L. 1758). Anales del Instituto de Biologia Universidad Nacional Autonoma de Mexico, 18, 507–516. and Cheloniodiplostomum testudinis (Dubois, 1936).
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