Flat-backed Millipede

Scientific Name: Polydesmida (Order)

Order & Family: Order Polydesmida; family varies by specific species (e.g., Paradoxosomatidae or Polydesmidae)

Size: Typically 10 mm to 50 mm (0.4 to 2 inches) in length depending on the species.

Natural Habitat

Damp environments, including leaf litter, mulch, gardens, under rocks or logs, and near building foundations.

Diet & Feeding

Detritivores; they primarily consume decaying organic matter, rotting wood, and damp leaves.

Behavior Patterns

Slow-moving and nocturnal. They are known for their flattened body segments and lack of eyes. Many species can produce defensive secretions when threatened.

Risks & Benefits

Benefits: Essential decomposers that recycle nutrients back into the soil. Risks: Harmless to humans, though some may secrete a pungent liquid (sometimes containing cyanide in trace amounts) that can irritate skin or eyes if handled roughly.

Identified on: 3/12/2026