Acastidae

alt=A finely prepared Walliserops trifurcatus trilobite fossil|thumb|Walliserops trifurcatus

genus of trilobites (fossil)

Acastidae is a family of trilobites in the order Phacopida, suborder Phacopina, superfamily Acastoidea, containing the following genera: {| border="0" cellpadding="05" | Acastava Acaste Acastella Acastellina Acastocephala Acastoides Acastopyge Armorigreenops Asteropyge Baniaspis Bellacartwrightia Bradocryphaeus Braunops Breizhops Centauropyge Chimaerastella Coltraneia Comura Cryphina Delocare Deloops Destombesina Dunopyge | Echinopyge Erbenochile Ewacaste Feruminops Gourdonia Greenops Gudralisium Hallandclarkeops Harringtonacaste Heliopyge Hexacosta Hollardops Kayserops Kennacryphaeus Klouceki