Arthropods include various spiders, millipedes, collembolans, beetles, and a variety of centipedes.
It also has endemic species, including the flightless Frégate Island giant tenebrionid beetle and some species of millipedes.
Crushed millipedes may have caused a 2013 minor train crash in Clarkson, Western Australia.
Several animal groups studied in Australia consist largely of short-range endemics, including freshwater and terrestrial Gastropods (snails and slugs), earthworms, velvet worms, mygalomorph spiders, schizomids, millipedes, phreatoicidean crustaceans, and freshwater crayfish.
Sphaeromimus, or the chirping giant pill millipedes, is a genus of giant pill millipedes (order Sphaerotheriida) endemic to southeastern Madagascar.