Two new species of cephaline gregarines from Odonata of West Bengal, India (Protozoa, Apicomplexa, Eugregarinida: Actinocephalidae)

The trophozoite and sporadin stages of Hoplorhynchus carusi sp.n. and Odonaticola brachydiplaxi sp.n., recovered from the midguts of adult Pseudagrion decorum (Ramb.) (Zygoptera: Coenagrionidae) and Brachydiplax farinosa Kruger (Anisoptera: Libellulidae) resp. (Mahananda Reserve Forest, West Bengal), are described and illustrated. The holotypes are in the Rishi Bankim Chandra College collection, Naihati, India. The possible pathogenic effects of the two gregarines on dragonflies are briefly discussed, and the bibliography on the taxonomy of the cephaline gregarines so far recorded in Odonata is provided.