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I found this creature in Hells Canyon by an abandoned mine. Flat-backed millipedes resemble centipedes. The bodies of the adults are flat, dark brown, with about twenty segments. They measure 14–25 millimetres (0.55–0.98 in) in length and are about 0.4 mm (0.016 in) wide. The plate segments covering the back are ridged along their lengths. The antennae and legs are longer than in most other millipedes.