Myriapoda is a subphylum of arthropods containing millipedes, centipedes, and others. The group contains over 13,000 species, most of which are terrestrial. Although their name suggests they have myriad (10,000) legs, myriapods range from having over 750 legs (the millipede Illacme plenipes) to having fewer than ten legs. The scientific study of myriapods is myriapodology, and those who study myriapods are myriapodologists.