A new species of dicyemid mesozoan,Dicyemennea coromandelensis n.sp. from the renal appendages ofSepia elliptica Hoyle is described. This is the first report of a dicyemid mesozoan parasite from this molluscan host and the first from the Coromandel coast. The morphology of the nematogens, rhombogens and vermiform embryos is described and the systematic position of the new species is discussed.
Four new species of mesozoansviz Dicyema ganapatii n.sp. from the renal appendages ofSepia elliptica Hoyle,Dicyema madrasensis n.sp. andDicyema octopusi n.sp. from the renal appendages of Octopus sp., andDicyema nouveli n.sp. from the renal appendages ofLoligo duvauceli d’ Orbigny are described. All the hosts were collected from different localities on the east coast of India.