Millipede vs Centipede — How to Tell Them Apart
One is a slow, harmless recycler of dead leaves; the other is a fast predator that can bite. Upload a photo and our free AI names it in seconds, or check the legs below.
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How to Identify Millipede vs Centipede
Check these features before you rely on any single one — the combination is what confirms the ID.
The defining difference. Millipedes have two pairs of legs on most body segments, so the legs look like a dense fringe. Centipedes have one pair per segment, so the legs look spaced out and stick out to the sides.
Millipedes are usually rounded and tube-like in cross-section, like a worm with legs. Centipedes are flattened from top to bottom.
Millipedes move slowly with a rippling wave of legs and curl into a tight spiral when disturbed. Centipedes run fast and dart for cover.
Millipede legs point down beneath the body. Centipede legs extend out from the sides, and the last pair is often long and trails behind like a second set of antennae.
Centipedes have long, many-segmented antennae and a pair of venomous claws (modified front legs) under the head. Millipedes have short, clubbed antennae and chewing mouthparts for decaying plants.
Millipedes need moisture and wander in from mulch and leaf litter, often in large numbers after rain or in fall. House centipedes live indoors in basements and bathrooms year-round, hunting other insects.
Many-Legged Bugs and How to Tell Them Apart
Millipede
Rounded, slow, two pairs of legs per segment, curls into a spiral. Doesn't bite, but some release a defensive fluid that can stain or irritate skin, so wash your hands after handling.
House Centipede
Grey-yellow body with three dark stripes and 15 pairs of extremely long, banded legs; very fast. Can bite if handled, about like a bee sting, but it's a beneficial hunter of roaches and silverfish.
Stone or Soil Centipede
Brown or orange, flattened, with shorter legs, found under rocks, logs, and in soil. Small bites are painful but not dangerous to most people.
Giant Desert Centipede
Up to 6–8 inches, often orange or banded with a dark head, in the Southwest US. Painful bite with swelling; seek care if symptoms are severe or you're allergic.
Wireworm (Click Beetle Larva)
Shiny, stiff, yellow-brown worm with only three pairs of short legs near the head. Found in garden soil and often mistaken for a millipede.
Pill Bug / Sowbug
Grey, armored, oval, with seven pairs of legs. A crustacean, not an insect; pill bugs roll into a ball. Common in damp areas alongside millipedes.
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Frequently Asked Questions
Sources & References
Our identification guides are researched from the authorities below and reviewed by the IdentifyThis team. AI photo identification is a helpful starting point — for anything involving safety (venomous species, edibility, or medical symptoms), always confirm with a qualified expert before acting.
- CDC — Pest- and health-related guidance
- EPA — Integrated pest management
- UC IPM — University of California Pest Notes
- BugGuide — Entomology identification community
- Smithsonian — Insect & animal biology
Reviewed by the IdentifyThis team · Last updated August 2026