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ID: 1197388
User: 119.224.20.183
Article: Trilobite
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(Phylogeny)
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==Phylogeny==
 
==Phylogeny==
Despite their rich fossil record with thousands of [[genus|genera]] found throughout the world, the [[taxonomy]] and [[phylogeny]] of trilobites have many uncertainties.<ref name="Fortey01">{{citation|last=Fortey|first=R. A. | author-link=Richard Fortey |year=2001|title=Trilobite systematics: The last 75 years|journal=[[Journal of Paleontology]] |url=http://findarticles.com/p/articles/mi_qa3790/is_200111/ai_n8958763/|volume=75|pages=1141–1151|doi=10.1666/0022-3360(2001)075<1141:TSTLY>2.0.CO;2|issue=6}}</ref> Except possibly for the members of order [[Phacopida]], all nine trilobite [[order (biology)|order]]s appeared prior to the end of the [[Cambrian]]. Most scientists believe that order [[Redlichiida]], and more specifically its suborder [[Redlichiina]], contains a common ancestor of all other orders, with the possible exception of the Agnostina. While many potential phylogenies are found in the literature, most have suborder Redlichiina giving rise to orders [[Corynexochida]] and [[Ptychopariida]] during the Lower Cambrian, and the [[Lichida]] descending from either the Redlichiida or Corynexochida in the Middle Cambrian. Order [[Ptychopariida]] is the most problematic order for trilobite classification. In the 1959 [[Treatise on Invertebrate Paleontology]],<ref name=Treatise59>{{Citation |editor-last=Moore |editor-first=R. C. |title=[[Treatise on Invertebrate Paleontology]], Part O, Arthropoda 1, Trilobita |pages=''xix'' + 560 pp., 415 figs. |publisher=The Geological Society of America & The University of Kansas Press|place=Boulder, CO & Lawrence, KA |year=1959 |isbn=0-8137-3015-5}}</ref> what are now members of orders Ptychopariida, [[Asaphida]], [[Proetida]], and [[Harpetida]] were grouped together as order Ptychopariida; subclass Librostoma was erected in 1990<ref name=Fortey1990>{{citation|last1=Fortey |first1=R. A. |author-link=Richard Fortey |year=1990|title=Ontogeny, Hypostome attachment and Trilobite classification|journal=Palaeontology|volume=33 |issue=3| pages=529–576 |url=http://palaeontology.palass-pubs.org/pdf/Vol%2033/Pages%20529-576.pdf |accessdate=June 22, 2009}}</ref> to encompass all of these orders, based on their shared ancestral character of a natant (unattached) [[hypostome]]. The most recently recognized of the nine trilobite orders, Harpetida, was erected in 2002.<ref name=Ebach2002>{{citation|last1=Ebach|first1=M. C. |first2=K. J. |last2=McNamara|year=2002|title=A systematic revision of the family Harpetidae (Trilobita) |journal=Records of the Western Australian Museum |volume=21 |pages=135–167}}</ref> The [[progenitor]] of order Phacopida is unclear.
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Despite their rich fossil record with thousands of [[genus|genera]] found throughout the world, the [[taxonomy]] and [[phylogeny]] of trilobites have many uncertainties.<ref name="Fortey01">{{citation|last=Fortey|first=R. A. | author-link=Richard Fortey |year=2001|title=Trilobite systematics: The last 75 years|journal=[[Journal of Paleontology]] |url=http://findarticles.com/p/articles/mi_qa3790/is_200111/ai_n8958763/|volume=75|pages=1141–1151|doi=10.1666/0022-3360(2001)075<1141:TSTLY>2.0.CO;2|issue=6}}</ref> Except possibly for the members of order [[Phacopida]], all nine trilobite [[order (biology)|order]]s appeared prior to the end of the [[Cambrian]]. Most scientists believe that order [[Redlichiida]], and more specifically its suborder [[Redlichiina]], contains a common ancestor of all other orders, with the possible exception of the Agnostina. While many potential phylogenies are found in the literature, most have suborder Redlichiina giving rise to orders [[Corynexochida]] and [[Ptychopariida]] during the Lower Cambrian, and the [[Lichida]] descending from either the Redlichiida or Corynexochida in the Middle Cambrian. Order [[Ptychopariida]] is the most problematic order for trilobite classification. In the 1959 [[Treatise on Invertebrate Paleontology]],<ref name=Treatise59>{{Citation |editor-last=Moore |editor-first=R. C. |title=[[Treatise on Invertebrate Paleontology]], Part O, Arthropoda 1, Trilobita |pages=''xix'' + 560 pp., 415 figs. |publisher=The Geological Society of America & The University of Kansas Press|place=Boulder, CO & Lawrence, KA |year=1959 |isbn=0-8137-3015-5}}</ref> what are now members of orders Ptychopariida, [[Asaphida]], [[Proetida]], and [[Harpetida]] were grouped together as order Ptychopariida; subclass Librostoma was erected in 1990<ref name=Fortey1990>{{citation|last1=Fortey |first1=R. A. |author-link=Richard Fortey |year=1990|title=Ontogeny, Hypostome attachment and Trilobite classification|journal=Palaeontology|volume=33 |issue=3| pages=529–576 |url=http://palaeontology.palass-pubs.org/pdf/Vol%2033/Pages%20529-576.pdf |accessdate=June 22, 2009}}</ref> to encompass all of these orders, based on their shared ancestral character of a natant (unattached) [[hypostome]]. The most recently recognized of the nine trilobite orders, Harpetida, was erected in 2002.<ref name=Ebach2002>{{citation|last1=Ebach|first1=M. C. |first2=K. J. |last2=McNamara|year=2002|title=A systematic revision of the family Harpetidae (Trilobita) |journal=Records of the Western Australian Museum |volume=21 |pages=135–167}}</ref> The [[progenitor]] of order Phacopida is unclear. hello mr me im epic
   
 
==Relationship to other taxa==
 
==Relationship to other taxa==
Reason: ANN scored at 0.991325
Reporter Information
Reporter: Mark (anonymous)
Date: Thursday, the 12th of May 2016 at 08:38:37 AM
Status: Reported
Thursday, the 12th of May 2016 at 08:38:37 AM #104343
Mark (anonymous)

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