Acaste (trilobite)

Acaste; Temporal range: Silurian to Devonian
	Acaste downingiae, on display at the Natural History Museum, London
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Trilobita
Order:	Phacopida
Family:	Acastidae
Genus:	Acaste; Goldfuss, 1843
Species
	A. downingiae (Murchison, 1843) (type) synonyms Calymene downingiae, Phacops downingiae var. α. vulgaris; A. dayiana R. Richter & E. Richter, 1954; A. inflata (Salter, 1864) synonym Phacops downingiae var. γ. inflatus; A. lokii Edgecombe, 1993 synonym A. longisulcata, pro parti (mixed collection); A. podolica Balashova, 1968; A. subcaudata (Murchison, 1839) synonyms Asaphus subcaudatus, A. cawdori; A. talebensis Hollard, 1963; A. zerinae Edgecombe, 1993;
Synonyms
	Acastina

Acaste is a genus of extinct trilobite of the order Phacopida which lived throughout the Silurian period (Wenlock Group). Though many species had been included, it now has only one species, Acaste downingiae. It is characterized by a convex dorsal surface, an absence of spines, a shortening of the head-shield and a general rounding off of all angles.

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