Reptiles form a very prominent part of the fauna of India, but very little is known about the Entozoa of this group in the country. The foundation of our knowledge of the Trematode parasites of Reptiles is laid by Rudolphi (1819), Dujardin (1845) and Diesing (1850–58), all of whom have described them under a common genus Distomum, along with the forms from other hosts. Von Linstow (1877–85), Looss (1899) and Lühe (1900–11) have considerably extended our knowledge of these forms. They have also revised the observations of the earlier workers and have split up the original genus into several genera, thereby placing the group on a more scientific and natural basis.