Английская Википедия:Ampyx (trilobite)

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Шаблон:Short description Шаблон:Automatic taxobox

Ampyx is an Ordovician-Silurian genus of Asaphid trilobites of the family Raphiophoridae. Species of Ampyx are characterized by three extended spines on the head-shield, one spine derived from each free cheek, and one spine emanating from the glabellum.[1] Species include Ampyx linleyensis (Lanvirn-Caradoc series).[2]

Species of Ampyx grew to an average length of Шаблон:Convert.

Collective behaviour

Файл:Linear clusters of Ampyx priscus 2.png
Шаблон:Center

Fossils of the trilobite Ampyx priscus, dating back about 480 million years ago, have been recently described as clustered in lines along the ocean floor. The animals were all mature adults, and were all facing the same direction as though they had formed a conga line or a peloton. It has been suggested they line up in this manner to migrate, much as spiny lobsters migrate in single-file queues. Or perhaps they are getting together for mating. The findings suggest animal collective behaviour has very early evolutionary origins.[3][4]

Distribution

Fossils of Ampyx have been found in:[5]

Ordovician
  • Acoite, Suri, Ponon-Trehue, Sepulturas and San Juan Formations, Argentina
  • Sella Formation, Bolivia
  • Australia
  • Canada (British Columbia, Newfoundland and Labrador, Northwest Territories, Quebec, Yukon)
  • China
  • France
  • Iran
  • Ireland
  • Morocco
  • Norway
  • Russia
  • Sweden
  • United Kingdom
  • United States (California, Maine, Nevada, Tennessee, Virginia)
Silurian
  • Italy
  • United Kingdom

See also

References

Шаблон:Reflist

Шаблон:Taxonbar


Шаблон:Asaphida-stub Шаблон:Ordovician-animal-stub Шаблон:Silurian-animal-stub

  1. H H Swinnerton - Outlines of Palaeontology, Edward Arnold (Publishers) Ltd, 1972. Шаблон:ISBN.
  2. British Palaeozoic Fossils - Natural History Museum 4th edition 1975. Plate 8. Шаблон:ISBN.
  3. Fossil 'conga lines' reveal origins of animal swarms National Geographic, 17 October 2019.
  4. Vannier J, Vidal M, Marchant R, El Hariri K, Kouraiss K, Pittet B, El Albani A, Mazurier A and Martin E (2019) "Collective behaviour in 480-million-year-old trilobite arthropods from Morocco", Scientific Reports, 9: 14941. Шаблон:Doi
  5. Ampyx at Fossilworks.org