Acastidae

{{Automatic taxobox

| fossil_range = {{Geological range/linked|Silurian |Famennian}}

| image = Coltraneia oufatenensis, Middle Devonian, Hamar L'Aghdad Limestone, Morocco - Houston Museum of Natural Science - DSC01505.JPG

| image_caption = Coltraneia oufatenensis

| taxon = Acastidae

| authority = Delo, 1935

| subdivision_ranks = subfamilies{{cite journal|last1= Lieberman|first1= B.S.|last2= Kloc|first2= G.J.|year= 1997|title= Evolutionary and biogeographic patterns in the Asteropyginae (Trilobita, Devonian) Delo, 1935|journal= Bulletin of the American Museum of Natural History|volume= 232|pages= 127|hdl= 2246/1623}}

| subdivision =

• Acastinae Delo, 1935
• Acastavinae Struve, 1958
• Asteropyginae Delo, 1935

}}

Acastidae is a family of trilobites in the order Phacopida, suborder Phacopina, superfamily Acastoidea, containing the following genera:{{cite web |url=http://www.trilobites.info/ordphacopida.htm |title=Order Phacopida |author=S. M. Gon III |accessdate=December 1, 2010| archiveurl= https://web.archive.org/web/20110106020446/http://www.trilobites.info/ordphacopida.htm| archivedate= 6 January 2011 | url-status= live}}

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 Kloucekia Llandovacaste Metacanthina Mimocryphaeus Minicryphaeus Morocconites Mrakibina Neocalmonia Neometacanthus | Paracryphaeus Pelitlina Phacopidina Philonyx Pilletina Protacanthina Pseudocryphaeus Psychopyge Quadratispina Quadrops Radiopyge Rheicops Rhenops Saharops Sanidopyge Scotiella Sokhretia Stummiana Talus Tolkienia Treveropyge Turcopyge Walliserops