Cis castaneus is a species of tree-fungus beetles in the family Ciidae.

The nematode species Caenorhabditis monodelphis is a free-living species that can be found in galleries inside of the fungus Ganoderma applanatum (Polyporaceae) which grows on the stump of trees a few centimeters above ground.

It is phoretic on C. castaneus.

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