| seasonal morphological variations in bird schistosomes. | the present work is a contribution to the systematics of bilhorziello and dendritobilharzio. wildfowl was killed in hunting seasons or found dead in champagne-ardenne region, france, and autopsied with focus on schistosomes. seven anas plotyrhynchos (mallards), one ardeo cinerea (grey heron) and two cygnus olor (mute swans) were parasitized by bilharziella. one c. olor was parasitized by dendritobilharzia. depending on season and hosts, various morphological forms of bilharziello suggesting seve ... | 2006 | 17007212 |