Acastocephala

Acastocephala Temporal range: Silurian
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Trilobita
Order:	Phacopida
Family:	Acastidae
Genus:	Acastocephala Shergold, 1966
Species
A. macrops (Salter, 1864) (type) synonym Phacops downingiae var. β. macrops A. dudleyensis Shergold, 1966^[1]

Acastocephala is a genus of trilobite from the middle Silurian, known from the United Kingdom.^[2]

Etymology

The name is derived from the genus Acaste and the Ancient Greek κεφαλή (kephalē) "head", indicating the headshield is similar to Acaste.^[1]

Acastocephala may contain the ancestor of Acastava.^[1]

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).^[1]

^ ^a ^b ^c ^d Shergold, J.H. (1966). "A revision of Acaste downingiae (Murchison) and related trilobites" (PDF). Palaeontology. 9 (2): 183–207. Archived from the original (PDF) on 2011-07-16.
^ "BioLib: Biological library".