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American Giant Millipede

Narceus annularis

MillipedebeginnerHarmlessCommunal OK

No venom, no sting

Millipedes don't bite or sting and have no venom. Many do secrete defensive chemicals when stressed, so wash your hands after handling and keep them away from your eyes and mouth.

Secretes benzoquinones

Stains skin brown for several days and stings badly in the eyes or on broken skin. Wash your hands after handling, don't rub your face, and keep it well away from small children.

About

A hardy North American round-back, close cousin to Narceus americanus and kept identically — an excellent beginner millipede. Give 4-6 inches of moisture-retaining, hardwood-rich substrate (rotting wood is the single most important food), leaf litter, and a calcium source. Comfortable at 68-80°F and 65-80% humidity. Supplement with cucumber, other veg, and occasional fish flakes. Long-lived (up to ~10 years) and fine in small groups. Docile detritivore; wash hands after handling.

Taxonomy

FamilySpirobolidae
GenusNarceus
Native regionCentral & eastern USA
TypeTerrestrial
Temperamentdocile, harmless detritivore

Size & growth

Adult size~4 in (100 mm)
Body length2.95–3.94 in
Growth rateslow
Life stagesNo distinct stages
DevelopmentAnamorphic — gains segments with each moult

Millipedes molt underground in a small chamber and can stay buried for weeks. If yours has disappeared into the substrate, leave it be — digging it up mid-molt can kill it.

Climate

Temperature68–80°F
Humidity65–80%

Enclosure

Adult sizeterrestrial tank with deep substrate; good ventilation
Substratemoist hardwood-rich soil/compost + rotten wood & leaf litter; add calcium
Substrate depth4-6 inches
Water dishOptional
Moisture gradientRequired — keep one end damp, one end dry

Feeding

Feeding modeDetritivore (decaying matter)
Food & schedulecontinuous — leaf litter, decaying hardwood, veg + calcium
Supplemental calciumRequired — cuttlebone or a calcium powder

Times kept: 0