Noun
a family of Onychophora
Source: WordNetAll genera are assigned to one of two families, the distribution ranges of which do not overlap but are separated by arid areas or oceans: *The Peripatopsidae exhibit relatively many characteristics that are perceived as original or "primitive". Source: Internet
They are longer, on average, than the Peripatopsidae and also have more leg pairs, numbering between 22 and 43—the gonopore is always between the penultimate pair. Source: Internet