Plumatyla humerosa is a millipede species found in mines, as well as lava tube and limestone caves of northern California and south-central Oregon.

[1] It belongs to the family Conotylidae.

[1] The millipede is likely a troglophile with a white carapace and observed in lava caves though it may inhabit crevices as well.

[2][3] P. humerosa is observed frequenting areas with mold or bat feces on the cave floors.

[2] Taracus marchingtoni has been observed feeding on P. humerosa within cave habitat.