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| insect larva that constructs a protective case around its body | |||
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| mat-forming lithophytic or terrestrial fern with creeping rootstocks and large pinnatifid fronds found throughout North America and Europe and Africa and east Asia ❲Polypodium vulgare❳ | |||
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| larva of the caddis fly; constructs a case of silk covered with sand or plant debris |