Receptaculites

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Receptaculites is the name-bearing genus for an extinct group of conspicuous benthic marine genera, the receptaculitids (formally Receptaculitaceae or Receptaculitidae), that lived from the Early Ordovician through the Permian period, peaking in the Middle Ordovician. The group's phylogenetic origin has long been obscure, with some arguing that they were calcareous algae, probably of the order Dasycladales.[1] Receptaculitids lived in warm, shallow seas,[1] but consensus disagreeing.[2][3] They have been described from all continents except Antarctica.[4][5] In some areas they were important reef-formers, and they also occur as isolated specimens.[6]

File:KimmswickOzoraMidOrdReceptaculitid.jpg
Receptaculitid from the Kimmswick Limestone (Middle Ordovician) near Ozora, Missouri.
File:Receptaculites oweni.jpg
Receptaculites oweni, late Ordovician, Red River Formation, Garson, Manitoba.

Receptaculites and its relatives have a double-spiral, radiating pattern of rhombus-shaped plates supported by spindle-like objects called meroms.[7] Fossils can usually be identified by the intersecting patterns of clockwise and counterclockwise rows of plates or stalk spaces, superficially similar to the arrangement of disk florets on a sunflower—hence the common name "sunflower coral" (sic).[8]

Receptaculitids have sometimes been compared to the morphologically similar, but probably distantly related, cyclocrinitids.[9][10]

Some dolomitic limestone deposits, such as Tyndall stone in Manitoba, Canada, are particularly rich in Receptaculites fossils.

References

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  1. ↑ a b Byrnes, J.G. 1968. Notes on the nature and environmental significance of the Receptaculitaceae. Lethaia, vol. 1, p. 368-381.
  2. ↑ Script error: No such module "citation/CS1".
  3. ↑ Script error: No such module "citation/CS1".
  4. ↑ Rietschel, S. and Nitecki, M.H. 1984. Ordovician Receptaculitid algae from Burma. Palaeontology, vol. 27, p. 415-420.
  5. ↑ Script error: No such module "Template wrapper".
  6. ↑ Pratt, B.R. and Weissenberger, J., 1988. Fore-slope Receptaculitid mounds from the Frasnian of the Rocky Mountains, Alberta. In: Reefs: Canada and adjacent areas, Canadian Society of Petroleum Geologists Memoir 13, p. 510-513.
  7. ↑ Script error: No such module "citation/CS1".
  8. ↑ Script error: No such module "Citation/CS1".
  9. ↑ Script error: No such module "Citation/CS1".
  10. ↑ Script error: No such module "Citation/CS1".

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File:Tyndal Stone with fossil.jpg
Receptaculitid in Ordovician Tyndall limestone from Manitoba, Canada.

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