Artiopoda - Phacopida - Acastidae
Parent taxon: Acastidae according to E. Tomczykowa 1991
See also Shergold 1966
Sister taxa: Acastava, Acaste, Acastella, Acastellina, Acastoides, Acastopyge, Armorigreenops, Asteropyginae, Baniaspis, Bellacartwrightia, Braunops, Breizhops, Centauropyge, Chimaerastella, Coltraneia, Cryphina, Delocare, Deloops, Echinopyge, Feruminops, Gourdonia, Greenops, Gudralisium, Hallandclarkeops, Harringtonacaste, Hexacosta, Hollardops, Kayserops, Kennacryphaeus, Kloucekia, Llandovacaste, Mimocryphaeus, Morocconites, Neocalmonia, Paracryphaeus, Pelitlina, Phacopidina, Pilletina, Protacanthina, Pseudocryphaeus, Psychopyge, Rheicops, Sanidopyge, Scotiella, Sokhretia, Stummiana, Tolkienia, Treveropyge, Turcopyge, Walliserops
Subtaxa: Acastocephala
Ecology: fast-moving low-level epifaunal carnivore
Distribution:
• Silurian of the United Kingdom (3 collections)
Total: 3 collections each including a single occurrence