Trilobita - Phacopida - Acastidae

Parent taxon: Acastidae according to P. A. Jell and J. M. Adrain 2003

Sister taxa: Acastava, Acaste, Acastella, Acastoides, Armorigreenops, Asteropyge, Asteropyginae, Baniaspis, Bellacartwrightia, Bradocryphaeus, Braunops, Breizhops, Chimaerastella, Coltraneia, Comura, Deloops, Erbenochile, Greenops, Hallandclarkeops, Harringtonacaste, Heliopyge, Hollardops, Kayserops, Kennacryphaeus, Kloucekia, Metacanthina, Mimocryphaeus, Neocalmonia, Paracryphaeus, Phacopidina, Pilletina, Protacanthina, Pseudocryphaeus, Psychopyge, Scotiella, Sokhretia, Stummiana, Tolkienia, Treveropyge

Subtaxa: none

Ecology: fast-moving low-level epifaunal carnivore