No millipede has a thousand legs. Most species kept in terrariums have between 80 and 400, and the record holder — Eumillipes persephone, described from a Western Australian borehole in 2021 — has 1,306. The name is a description of the impression, not a count.
Quick answer
A millipede has two pairs of legs on most body segments, which is the single fact that separates the group from every other arthropod. Common pet species carry roughly 100 to 400 legs as adults. The first few segments behind the head carry one pair or none, and the last segment carries none at all.
Why two pairs per segment
What looks like one segment on a millipede is actually two fused together, a structure called a diplosegment. Each diplosegment carries two pairs of legs, two pairs of nerve ganglia and two pairs of breathing pores. Centipedes, by contrast, carry exactly one pair per segment — which is the fastest way to tell the two apart in a photograph. We cover the rest of that comparison in centipede vs millipede.
The reason for the doubling is mechanical. Millipedes burrow head-first through compacted leaf litter and soil, and a short, densely packed leg arrangement generates the pushing force that job needs. Centipedes chase prey across the surface; they need stride length, not thrust.
The count changes as the animal grows
Millipedes grow by anamorphosis — they add segments, and therefore legs, at each moult. A hatchling emerges with only three pairs of legs and a handful of segments. Every moult adds more, until the animal reaches its adult segment count and stops. This means the leg count on any given millipede tells you roughly how mature it is, and that two animals of the same species can have genuinely different leg counts.
Each moult is also the point of greatest risk. The animal sheds its exoskeleton underground and stays soft for days, which is why substrate depth and calcium availability matter so much — both covered in our millipede care guide.
Rough leg counts by group
| Group | Typical adult segments | Approximate legs |
|---|---|---|
| Giant African and Asian spirostreptids | 50-60 | 200-400 |
| Flat-backed millipedes (Polydesmida) | 19-20 | Around 60-70 |
| Pill millipedes (Glomerida) | 11-13 | Around 36-40 |
| Eumillipes persephone | 330 | 1,306 |
The flat-backed group is worth noting because it breaks the intuition entirely — a Pink Dragon Millipede is a striking animal with fewer legs than most people assume, because Polydesmida have a fixed and comparatively low segment count.
What that means for the animals we keep
Most of the millipedes in our millipede collection are large spirostreptids, which sit at the upper end of the range. Alienostreptus bicoloripes — sold under leg-colour trade names including Red Leg, Grey Leg, Inferno Leg and Sunset Leg — is a good example: the leg colour is the whole reason the morphs are distinguishable, and there are several hundred of them on a mature animal to look at.
Treptogonostreptus intricatus, the Cameroon Pink Foot, is named for the same feature. In both cases the legs are the identifying character, not an incidental one.
Counting legs on a live animal
It is not practical, and it is not worth stressing the animal to try. Count body rings instead and multiply by four, subtracting the first four rings and the last. That gets you within a few pairs, which is as precise as the question ever needs to be.
If you want a defensible number for a specific animal, the moult stage matters more than the species average. Every animal we hold has an accession record in the SpeciesVault registry recording its origin and identification status, because a great many millipedes in the trade are undescribed and a trade name is not a species.
Common questions
Do millipedes really have 1000 legs?
No. The name comes from Latin for thousand-foot, but the highest count ever recorded in any millipede is 1,306, in a single deep-soil Australian species described in 2021. Species kept in terrariums typically have 100 to 400.
How many legs does a millipede have per segment?
Two pairs, or four legs, on most segments. Each apparent segment is two fused segments, called a diplosegment. The first few behind the head and the final segment are exceptions and carry one pair or none.
Do millipedes grow more legs?
Yes. They add body segments at each moult through a process called anamorphosis, so leg count rises with age until the animal reaches its adult segment number. A hatchling starts with three pairs.
How many legs does a centipede have compared with a millipede?
Centipedes have one pair per segment and typically 30 to 350 legs in total. The per-segment count is the reliable difference — one pair means centipede, two pairs means millipede.
Can a millipede regrow a lost leg?
Yes. Lost legs regenerate over successive moults, which is one more reason a smooth moult matters and why deep substrate and constant calcium access are the foundation of good husbandry.