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Asaphidae

{{Short description|Extinct family of trilobites}}

{{Automatic taxobox

| fossil_range = {{fossil_range|Upper Cambrian|Ordovician}}

| image = Asaphus latus dorsolateral.jpg

| image_caption = Asaphus latus

| taxon = Asaphidae

| authority = Burmeister, 1843

| subdivision_ranks = Subfamilies

| subdivision_ref = {{cite journal|last1= Bell|first1= Mark A.|last2= Braddy|first2= Simon J.|year= 2011|title= Cope's rule in the Ordovician trilobite family Asaphidae (order Asaphida): patterns across multiple most parsimonious trees|journal= Historical Biology|pages= 1–8|url= https://www.researchgate.net/publication/254238189|doi=10.1080/08912963.2011.616201|s2cid= 84438297}}

| subdivision =

}}

Asaphidae is a family of asaphid trilobites. Although the first genera originate in Upper Cambrian marine strata, the family becomes the most widely distributed and most species-rich trilobite family during the Ordovician. 754 species assigned to 146 genera are included in Asaphidae.

Distribution

Most Asaphinae are characteristic of Baltica. Isotelinae genera are concentrated in Laurentia. The genera of Nobiliasaphinae are distributed in tropical Gondwana and South China. The genera of Ogygiocaridinae occur in Avalonia, Gondwana and Baltica. Asaphidae asaphids were already fairly common during the Upper-Cambrian, when 14 genera are known from Australia, North- and South-China. The last members of the family died-out at the end of the Ordovician.{{cite book|chapter= 20. A synopsis of Ordovician trilobite distribution and diversity|author= J.M. Adrian|title= Early Palaeozoic Biogeography and Palaeogeography|series= Memoirs of the Geological Society of London|volume= 38|editor= D.A.T. Harper |editor-link=D.A.T. Harper |editor2=T. Servais|publisher=Geological Society of London|year= 2014|isbn= 978-1862393738|pages= 490}}

File:Asaphellus_fossil_from_Mila_formation,_Ordovician_period,_Damghan,_Iran_01.jpg fossil from Mila formation, Ordovician period, Damghan, Iran]]

Assigned genera

File:Homotelus bromidensis fossil trilobites (Bromide Formation, Middle Ordovician; Criner Hills, southeastern Carter County, southern Oklahoma, USA) 2 (15382644846).jpg]]

Asaphidae contains the following genera:{{cite web |url=http://www.trilobites.info/ordasaphida.htm |title=Order Asaphida |author=S. M. Gon III |accessdate=December 7, 2010| archiveurl= https://web.archive.org/web/20110106064019/http://www.trilobites.info/ordasaphida.htm| archivedate= 6 January 2011 | url-status= live}}

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References

{{Reflist}}

Links

  • {{cite web|url=http://www.macroevolution.narod.ru/ivantsov/ivantsov.htm|title=Drawings of many asaphids|website=Problems of evolution|archive-url=https://web.archive.org/web/20140103232456/http://www.macroevolution.narod.ru/ivantsov/ivantsov.htm|archive-date=January 3, 2014|url-status=dead}}

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Category:Asaphoidea

Category:Cambrian first appearances

Category:Ordovician extinctions

Category:Trilobite families

Category:Paleozoic life of the Northwest Territories

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