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''Acastocephala'' is a genus of trilobite from the middle
Silurian The Silurian ( ) is a geologic period and system spanning 24.6 million years from the end of the Ordovician Period, at million years ago ( Mya), to the beginning of the Devonian Period, Mya. The Silurian is the shortest period of the Paleozo ...
, known from the United Kingdom.


Etymology

The name is derived from the genus ''
Acaste Acaste (; Ancient Greek: Ἀκάστη) was the name of two figures in Greek mythology. * Acaste, one of the Oceanids. She was among the companions of Persephone when Persephone was abducted by Hades. * Acaste, the nurse of the daughters of king ...
'' 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 The Buildwas Formation (''Bw'', ''BUI''), formerly called Wenlock Shale and Buildwas Beds, is a geologic formation in Shropshire, England. It preserves fossils dating back to the Silurian period. The formation is the defining formation of the She ...
, Malvern, Worcestershire; Wenlock Limestone, Pen-y-Lan, Cardiff, and Dudley and Ludlow,
Ledbury Ledbury is a market town and civil parish in the county of Herefordshire, England, lying east of Hereford, and west of the Malvern Hills. It has a significant number of timber-framed structures, in particular along Church Lane and High Street ...
, Hereford). * ''A. dudleyensis'' has been found in the Middle Silurian of the United Kingdom (Wenlock Limestone, Wren's Nest, Dudley, Worcestershire).


References


External links


Wenlock Trilobite ''Acastocephala'' - Fossilmuseum.net
Acastidae Silurian trilobites of Europe Fossils of Great Britain Fossils of England Fossils of Wales {{phacopida-stub