An investigation has been made to study the protozoan ciliates of subfamily Diplodiniinae (Order: Entodiniomorphida) from the rumen of cattle (Bos indicus). The present paper deals with the occurrence of some Diplodiniid ciliates from the rumen of cattle (Bos indicus) in India. The size and morphology of the species is compared to those previously reported in different geographical areas. In the present investigation D. anacanthum (Dogiel, 1927) and D. triacanthum (Dogiel, 1927) recorded first time in India from the rumen of cattle (B. indicus). D. tetracanthum (Dogiel, 1927) is reported from the rumen of cattle as a new host record in India. .

Keywords: Rumen; Cattle; Ciliates; Diplodinium.