An order of Arachnida with two families, Protoschizomidae (Agastoschizomus, Protoschizomus) and Schizomida (Schizomus, Trithyreus, Megaschiz­omus), including about 130 described species, mainly in the genus Schizomus. Schizomids occur in most tropical and warm temperate regions, but each species has a restricted distribution. Many undescribed species probably occur in tropical leaf litter and caves. Schizomids are most closely related to Uropygi, with which they share several evolutionary novelties.