The cercarial chaetotaxy permits the differenciation of four groups of Schistosomatinae. --Schistosomatium douthitti, parasite of Stagnicola and Lymnaea (Lymnaeidae); --Schistosoma japonicum, parasite of Oncomelania (Melaniidae); --Schistosoma mansoni and S. rodhaini, parasites of Biomphalaria (Planorbiinae, Bulinidae); --Schistosoma haematobium, S. bovis, S. margrebowiei, S. mattheei, S. leiperi and S. intercalatum, parasites of Isidora, Physopsis and Bulinus (Bulininae, Bulinidae). For the third group, cercaria of Schistosoma mansoni and S. rodhaini may be distinguished. In the fourth group, small statistical differences in the topography of the sensillae can be shown between the various species.