Data from: A redescription of the leggiest animal, the millipede Illacme plenipes, with notes on its natural history and biogeography (Diplopoda, Siphonophorida, Siphonorhinidae)

With up to 750 legs, the millipede Illacme plenipes Cook and Loomis, 1928
is the leggiest animal known on Earth. It is endemic to the northwestern
foothills of the Gabilan Range in San Benito County, California, where it
is the only known species of the family Siphonorhinidae in the Western
Hemisphere. Illacme plenipes is only known from 3 localities in a 4.5 km2
area; the 1926 holotype locality is uncertain. Individuals of the species
are strictly associated with large arkose sandstone boulders, and are
extremely rare, with only 18 specimens known to exist in natural history
collections. In contrast with its small size and unassuming outward
appearance, the microanatomy of the species is strikingly complex. Here we
provide a detailed redescription of the species, natural history notes,
DNA barcodes for I. plenipes and similar-looking species, and a predictive
occurrence map of the species inferred using niche based distribution
modeling. Based on functional morphology of related species, the extreme
number of legs is hypothesized to be associated with a life spent
burrowing deep underground, and clinging to the surface of sandstone
boulders.