MesniliumMesnilium is a genus of parasitic alveolates belonging to the phylum Apicomplexa. Its vertebrate hosts are fish. The vectors are not presently known but are thought likely to be leeches.TaxonomyThe genus was created in 1972 by Misra, Haldar and Chakravarty.DescriptionMerogony occurs in erythrocytes and reticulo-endothelial cells. Gamogony occurs only in erythrocytes and pigment granules are present only in microgamonts and macrogametes.HostsThe only known host of this parasite is the freshwater murrel.