A New Commensal Ciliate,Zoothamnium paraentzii (Ciliophora,Peritrichida)

The present paper deals with a new commensal peritrich ciliates,Zoothamnium paraentzii nov.spec.on the penaeid shrimp Penaeus orientalis in seawater.The silver line system and infraciliature of the new species were studied by means of the protargol and dry silver impregnation method.