Trilobita - Phacopida - Acastidae
Parent taxon: Acastoidea according to J. M. Adrain 2011
See also Edgecombe 2007, Reijers 1972 and Whittington et al. 1997
Sister taxon: Calmoniidae
Subtaxa: Acastava Acaste Acastella Acastellina Acastoides Acastopyge Armorigreenops Asteropyginae Baniaspis Bellacartwrightia Braunops Breizhops Centauropyge Chimaerastella Coltraneia Cryphina Delocare Deloops Echinopyge Feruminops Gourdonia Greenops Hallandclarkeops Harringtonacaste Heliopyge Hexacosta Hollardops Kayserops Kennacryphaeus Kloucekia Llandovacaste Metacanthina Mimocryphaeus Morocconites Neocalmonia Neometacanthus Paracryphaeus Pelitlina Phacopidina Pilletina Protacanthina Pseudocryphaeus Psychopyge Sanidopyge Scotiella Sokhretia Stummiana Tolkienia Treveropyge Turcopyge Walliserops
Ecology: fast-moving low-level epifaunal carnivore
Distribution:
• Devonian of Afghanistan (8 collections), Algeria (8), Australia (4), Belarus (1), Belgium (5), Bolivia (3), Canada (2: Ontario), Colombia (1), the Czech Republic (1), France (46), Germany (13), Iran (4), Libya (5), Luxembourg (2), Mauritania (1), Morocco (31), New Zealand (1), Pakistan (2), Poland (21), Spain (23), Turkey (4), Ukraine (7), the United Kingdom (1), United States (181: Illinois, Indiana, Iowa, Michigan, New York, Ohio, Pennsylvania), Uruguay (1), Venezuela (4)
• Silurian to Devonian of Algeria (3), Morocco (3), Poland (2), Ukraine (1)
• Silurian of Argentina (2), Belarus (1), Estonia (3), France (1), Latvia (1), Poland (6), Spain (1), Ukraine (4), the United Kingdom (11), United States (1: Georgia)
• Ordovician of the Czech Republic (10), France (10), Morocco (9), Portugal (6), Spain (19), Turkey (1), the United Kingdom (14)
• Llandeilo of France (1), Spain (10), the United Kingdom (1)
Total: 501 collections including 725 occurrences