Acaste (trilobite)

Acaste
Temporal range: 443–397 Ma 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).[1] Though many species had been included, it now has only one species, Acaste downingiae.[2] 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.[3]

  1. ^ Edgecombe, G.D. (1993). "Silurian Acastacean trilobites of the Americas" (PDF). Journal of Paleontology. 67 (4): 535–548. Bibcode:1993JPal...67..535E. doi:10.1017/S0022336000024884. S2CID 132918487.
  2. ^ British Palaeozoic Fossils - Natural History Museum 4th edition 1975. Plate 29. ISBN 0-565-05624-7.
  3. ^ H H Swinnerton - Outlines of Palaeontology, Edward Arnold (Publishers) Ltd, 1972 (p. 247) ISBN 0-7131-2357-5.