Abstract
The Onychophora body plan have suffered few changes since its origin in the Cambrian period. Therefore, the Phylum is a keystone group to the study of invertebrate evolutionary patterns. The onychophorans have a Gondwanic distribution and only two extant families, Peripatopsidae and Peripatidae. The former has an Austral distribution whereas the later a Septentrional one. The family Perip…