Studies on the Prevalence of Endoparasitic Protozoans of Oligochaetes in the Bankura District of West Bengal
Keywords:Endoparasite, Monocystis, Earthworm, Oligochaetes, Bankura
Endoparasitic aseptate gregarines are commonly found in Annelida, particularly in seminal vesicles of earthworms. An extensive survey has been carried out for aseptate gregarine in earthworms in the Bankura district during the period of January 2022- December 2022. Different genera of host earthworms were studied for occurrence of aseptate gregarines throughout the year. To study the morphology, prevalence and life cycle of these parasites, earthworms were dissected and a small amount of seminal fluid was drawn out on the slide. Then they are fixed in Schaudin’s fixative, stained in Heidenhain’s hematoxylin and studied under the light microscope. During the survey four genera viz. Monocystis Stein, 1848, Nematocystis Hesse, 1909, Stomatophora Drzhevetskii, 1907, Apolocystis Cognetti de Martiis, 1923 are recorded but the prevalence of Monocystis Stein, 1848 and Stomatophora Drzhevetskii 1907, are much higher than the others. These endoparasites reproduce sexually and exhibit mainly three distinct stages viz. trophozoite, gametocyst and oocyst in their lifecycle.