ABSTRACT The marine water fish Dasyatis walga collected from Ratnagiri district during the period of June 2018 to May 2019. After dissection their intestinal passage was examined for tapeworm parasite. The genus Uncibilocularis was established by Southwell (1925) with its type species U. trygonis (Shipley et Hornell 1906), the histopathological studies were carried out and observation clearly shows that the parasite, Uncibilocularis dasyatisii Sp. Nov. was approaching to the intestinal villi, embedded in the fibroblast cell and is attached to the intestinal villi. The histopathological studies of tapeworm Uncibilocularis dasyatisii Sp.Nov. Have been studied to find the pathological changes and extend of damage of the intestinal layers of Dasyatis walga.