Rhizophagus cylindricus is a species of root-eating beetle in the family Monotomidae.

More specifically, from New York to Georgia, and west to Ohio and Alabama.

The bases of its front legs are widened; antenna clubbed.

[4] This beetle is commonly found under the bark of pine trees.

Not much is known regarding the diet of R. cylindricus, but Rhizophagus generally eats fungi and dead insects.