Entomopathogenic fungus?
Entomo = insects, pathogenic = causing or capable of causing disease.
A wide variety of fungi are associated with terrestrial invertebrates (such as insects and spiders). Often these fungi attach to the external body surface of insects or spiders via their spores. These spores could colonize the body of the host and eventually kills the host. Then the fungus emerges out of the body to propagate another generation of spores. Some very fascinating varieties of these fungi are those that cause what we sometimes refer to as Zombie Ants...as Spock would say..."Fascinating".
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Moth colonized by fungus.
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Spider colonized by fungus.
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