Cercariae of Proterometra dickermani grow to fully mature adults in tissues of its snail host. Although adults are known to absorb glucose by Na+-dependent active transport, we found that glucose uptake by cercariae was Na+-independent. Cercarial transport also was insensitive to phlorizin, but it was inhibited by phloretin indicating facilitated diffusion, the type of transport found in both cercariae and gut-dwelling adults of Proterometra macrostoma and Proterometra edneyi. Thus, active transport in the adult of P. dickermani is interpreted as a secondary specialization consistent with the known sugar transport capacities of other tissue-dwelling digeneans.