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Figure 1


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Backlit views of metazoan parasites trapped in the shell of Cornu aspersum: trematode cercariae (A, B, C), and nematode (D). Small cracks of the inner shell layer (B) can be seen above the cercariae and were considered indicative of damage on the shell after it covered cercariae. Note the accumulation of dark adhering cells around or above the parasites for both cercariae (C) and nematodes (D). High-resolution versions of these images are archived in Zenodo (

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