They lived in the Ordovician period (478-449 million years ago),[1] from the Upper Tremadocian age until the Lower Llanvim age. These arthropods were a low-level epifauna, fast-moving and detritivore.
Ordovician of Australia, China, Colombia (Serranía de la Macarena, Meta), the Czech Republic, Iran, Norway, United States (Nevada); Arenig of Argentina, Bolivia, China, France, Norway, Sweden, United States (Montana); Dawan of China; Arenigian of Argentina.[1]