The organisms attached to the beetle are Laboulbeniales fungi. Individually a lot of them look like little baseball bats or have similar but more complex structures and usually they occur as a small clump growing out of the integument of the organism. They live on beetles and a lot of other insects. Generally they are nonpathogenic and the insects just tolerate them. The fungi derive nourishment from the beetle by attaching to the integument and do not extend into the internal organs.
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