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American giant millipede
Narceus americanus
A satisfyingly large, completely harmless North American millipede, highly recommended for bio-active forest terrariums and beginner arthropod enthusiasts seeking a docile invertebrate pet.
Class:Diplopoda
Order:Spirobolida
Family:Spirobolidae
Genus:Narceus
Species:Narceus americanus
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Environment
Terrestrial
Humidity
70 - 80 %
Ambient temperature
20 - 24 °C
Day temperature
25 °C
Night temperature
21 °C
Substrate depth
>= 12 cm
UVB
None
Species description
Geographical Origin and Habitat: The American giant millipede (Narceus americanus) is native to the eastern and central regions of North America, ranging widely from southern Canada down to Florida and west to Texas. It inhabits the damp forest floors of deciduous and mixed temperate woodlands, living under rotting logs, stones, moss beds, and within deep, decaying leaf litter.
Taxonomy and Genetics: Belongs to the class Diplopoda, order Spirobolida, family Spirobolidae, and genus Narceus. It is one of the largest native millipede species in North America. Genetically, it belongs to a species complex with regional variations in size and striping, sometimes classified under synonyms or sibling species names.
Behavior and Habits: A peaceful, nocturnal detritivore. It spends daylight hours burrowed in the substrate or hidden beneath decaying wood to avoid desiccation. It is harmless and does not bite; when threatened, it rolls into a tight spiral to protect its soft ventral parts and may secrete a defensive fluid containing benzoquinones that can temporarily stain skin.
Morphology: Features a cylindrical, segmented body composed of 50-60 segments, with adult lengths ranging between 10 and 14 centimeters. Each body segment bears two pairs of short legs. Coloration is dark grey to brownish-black, highlighted by thin, attractive bands of pink, red, or orange outlining the edge of each segment.
Care, breeding and tankmates
Terrarium Setup: A glass or plastic enclosure of at least 40x30x30 cm is suitable for 3-4 specimens. The substrate is the most critical element and must be at least 10-15 cm deep (equal to the millipede's length). The mix should consist of organic compost soil, decaying hardwood leaves (oak/beech), crumbled rotting wood, and sphagnum moss. Avoid pure coconut fiber.
Lighting and Heating: Prefers moderate temperate conditions, with temperatures kept between 20 and 24 °C. High temperatures above 27 °C can be fatal. No supplemental lighting or UVB is required, as they spend most of their time in darkness. Ambient room light is sufficient to establish a natural day-night cycle.
Humidity and Hydration: Substrate humidity must be kept high (70-80%) but never soggy. Mist the enclosure regularly with dechlorinated water. Keep one corner of the tank covered with damp sphagnum moss to provide a moisture gradient. Standing water dishes are unnecessary and pose a drowning risk; they absorb moisture from food and soil.
Feeding and Supplementation: The primary food source must be the decaying leaves and wood within the substrate. Supplement this diet with small pieces of fresh vegetables (squash, carrots, cucumber) and fruits (apple, banana), removing uneaten food before mold develops. Provide a source of calcium, such as powdered calcium carbonate or cuttlebone.
Compatibility: Completely peaceful. They can be kept in groups or cohabitated with other docile decomposers like isopods and springtails in a bioactive setup. Never house them with predatory insects, centipedes, or reptiles that might attack them or disturb them during delicate molting periods.
Health and Common Diseases: Desiccation due to dry substrate is the most common cause of death. Mites are commonly found on wild-caught specimens; most are harmless commensals, but high populations can cause stress. Avoid chemical exposure (pesticides on food/leaves). Do not dig up or handle millipedes when they are underground molting.
Geographic Origin and Distribution
The American giant millipede (Narceus americanus) is native to the eastern and central regions of North America, ranging widely from southern Canada down to Florida and west to Texas. It inhabits the damp forest floors of deciduous and mixed temperate woodlands, living under rotting logs, stones, moss beds, and within deep, decaying leaf litter.
Origin
North America
Terrestrial invertebrate profile
- Diet
- No verified data available
- Life expectancy
- No verified data available
- Adult size
- 14 cm
- Lifestyle/Microhabitat
- No verified data available
- Activity cycle
- No verified data available
- Sociality
- No verified data available
- Reproduction
- No verified data available
- Venom level
- No verified data available
- Handling tolerance
- No verified data available
- Brumation
- No verified data available
- Molting
- No verified data available
The catalog's scalar value is 14 cm. The BugGuide — Narceus americanus source reports a maximum adult measurement of 14 cm for this species, recorded as total length (TL). The taxonomic record consulted is Narceus americanus. These figures are not interchangeable: the first is the profile's editorial reference, whereas the second is a published maximum under a specific measurement convention; differences among sources can reflect sex, population, life stage and measuring method.
Image gallery
Licensed images linked to the species or, when marked, to the closest representative taxon.
Related species
Recommendations grouped by close relatives, companion choices, and similar care.
