Abstract
A 6-cm petri dish half-filled with artificial spring water was used to study the attraction of Echi- nostoma revolutum cercariae to Biomphalaria glabrata snail dialysate. The dish was divided into 3 equal zones each about 9 cm2. Zone A contained a single B. glabrata snail in a 2 x 1-cm dialysis sac about 5 cm from an empty dialysis sac in Zone C. The middle zone, B, received 5 cercariae by pipet. In each of 5 experiments, within 30 min of cercarial introduction, more than twice the cercariae were in Zone A than in either Zone B or C. In the absence of a snail in Zone A, cercariae were equally distributed in all 3 zones. Echinostoma revolutum cercariae were attracted to B. glabrata dialysate in the absence of host penetration or encystment stimuli. Echinostoma revolutum cercariae have a pre- dilection for the kidneys of snails and Rana tad- poles (Beaver, 1937; Anderson and Fried, 1987). In experimental infections, considerably more cercariae of E. revolutum encyst in the kidney of Biomphalaria glabrata snails than in either Phy- sa heterostropha or Helisoma trivolvis kidneys (Anderson and Fried, 1987).
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