Myriapoda

Subphylum of arthropods

Myriapods (from Ancient Greek μυρίος (muríos) 'countless' and πούς (poús) 'foot') are the members of subphylum Myriapoda, containing arthropods such as millipedes and centipedes. The group contains about 13,000 species, all of them terrestrial. Molecular evidence and similar fossils suggests a diversification in the Cambrian Period, and trace fossils indicate that myriapods inhabited the land by the Ordovician Period.

From Wikipedia, under CC BY-SA. More on occurri.