The Family Peripatopsidae refers to a group of ancient velvet worms that are found in different parts of the world. These animals are also known by other names, such as Peripatus, Onychophora, and velvet worm. The term Onychophora comes from the Greek words onyx, meaning nail, and pherein, meaning to bear, while velvet worm relates to their smooth and velvety skin. These creatures are also sometimes referred to as living fossils due to their ancient origins that date back to the Cambrian period. Though they are often compared to insects, velvet worms are unique creatures with their own set of physical features and behaviors.