title: Acastocephala
text: # Acastocephala
  
  Acastocephala is a genus of trilobite from the middle Silurian, known from the United Kingdom.
  
  ## Etymology
  
  The name is derived from the genus Acaste and the Ancient Greek κεφαλή (kephalē) "head", indicating the headshield is similar to Acaste.
  
  ## Taxonomy
  
  Acastocephala may contain the ancestor of Acastava.
  
  ## Distribution
  
  * A. macrops occurs in the Middle Silurian of the United Kingdom (Wenlock Shale, Malvern, Worcestershire; Wenlock Limestone, Pen-y-Lan, Cardiff, and Dudley and Ludlow, Ledbury, Hereford).
  * A. dudleyensis has been found in the Middle Silurian of the United Kingdom (Wenlock Limestone, Wren's Nest, Dudley, Worcestershire).
  