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
Superorder: Phacopina
Order: Phacopida
Superfamily: Acastoidea
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.[1] They are characterized by a convex dorsal surface, an absence of spines, a shortening of the head-shield and a general rounding off of all angles.[2] Species include Acaste downingiae [3] (Wenlock Series).

Etymology

Taxonomy

Species previously assigned to Acaste

Some species originally designated to Acaste have now been reassigned to other genera.[4]

References

  1. 1 2 3 4 5 6 Edgecombe, G.D. (1993). "Silurian Acastacean trilobites of the Americas" (PDF). Journal of Paleontology. 67 (4): 535–548.
  2. H H Swinnerton - Outlines of Palaentology, Edward Arnold (Publishers) Ltd, 1972 (p. 247) ISBN 0-7131-2357-5.
  3. British Palaeozoic Fossils - Natural History Museum 4th edition 1975. Plate 29. ISBN 0-565-05624-7.
  4. Moore, R.C. (1959). Arthropoda I - Arthropoda General Features, Proarthropoda, Euarthropoda General Features, Trilobitomorpha. Treatise on Invertebrate Paleontology. Part O. Boulder, Colorado/Lawrence, Kansas: Geological Society of America/University of Kansas Press. pp. 1–560. ISBN 0-8137-3015-5.

See also

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