Figure 19.1.1.

The life cycle of human schistosomes (image courtesy of the Centers for Disease Control and Prevention, DPDx). The figure depicts several life cycle stages that are mentioned in the text. For information on time to development of particular stages (e.g. lung schistosomules, adult worms), see the text for these specific stages. Key collection points mentioned in the text include: miracidia, cercariae, schistosomules, adult worms, and eggs. Approximate measurements for the various stages are: cercaria length (body plus tail), 500 μm; adult female worm length, 12 mm; adult male worm length, 9 mm; egg (length × width), 140 × 60 μm; miracidium (length × width), 140 × 55 μm.