“…Throughout the last century, many evolutionary aspects of progenesis in trematodes have been the subjects of fruitful debates. Some authors have greatly contributed to our understanding of the phenomenon : Dollfus (1924Dollfus ( , 1927Dollfus ( , 1929Dollfus ( , 1938Dollfus ( , 1954Dollfus ( , 1958, Buttner (1950Buttner ( a, b, 1951Buttner ( a, b, c, 1953Buttner ( , 1955, Stunkard (1959Stunkard ( , 1976, Stunkard & Uzmann (1959), Grabda-Kazubska (1969, Font (1980Font ( , 1994, Font & Corkum (1975. However, most have focused on particular taxa (e.g.…”