| observations on the host-parasite relations between echinostoma revolutum and lymnaeid snails. | echinostoma revolutum from taiwan was studied in lymneid snails at 29 +/- 0.5 degrees c. given 3-5 miracidia, 95% of lymnaea ollula and 40% of lymnaea swinhoei became positive; the prepatent periods were 18 and 25 days, respectively. the following are based on the observations in lymnaea ollula: the time required for miracidial penetration was about one hour. the sporocysts developed only in the ventricle of the snail but mother rediae developed in the heart and other organs. mature daughter red ... | 1975 | 1243895 |