Iyali Peripatopsidae yana nufin rukuni na arthropods wanda aka fi sani da tsutsotsi na karammiski ko onychophorans. Ana samun waɗannan dabbobi a wurare masu zafi da na wurare masu zafi a duniya kuma ana siffanta su da laushi, jikinsu na silindi, waɗanda ke rufe da ƙananan ƙananan kashin baya. Suna da nau'i-nau'i iri-iri na gajerun ƙafafu masu kututture, kuma mafarauta ne waɗanda ke farautar ƙananan invertebrates kamar kwari da gizo-gizo. Tsutsotsin Velvet sun kasance na musamman domin suna amfani da wani abu mai ɗanɗano, mai kama da manne don hana ganimarsu maimakon dafi. Iyalin Peripatopsidae sun haɗa da nau'ikan nau'ikan kusan 200, kuma ana ɗaukar su burbushin halittu ne saboda tsaffin zuriyarsu da halayensu na farko.