The phylogeny of aglaspidid arthropods and the internal relationships within Artiopoda
Identifieur interne : 001317 ( Istex/Corpus ); précédent : 001316; suivant : 001318The phylogeny of aglaspidid arthropods and the internal relationships within Artiopoda
Auteurs : Javier Ortega-Hernández ; David A. Legg ; Simon J. BraddySource :
- Cladistics [ 0748-3007 ] ; 2013-02.
Abstract
The phylogenetic position of aglaspidids, a problematic group of Lower Palaeozoic arthropods of undetermined affinities, is re‐examined in the context of the major Cambrian and Ordovician lamellipedian arthropod groups. A cladistic analysis of ten genera of aglaspidids sensu stricto, six aglaspidid‐like arthropods and 42 Palaeozoic arthropod taxa indicates that Xenopoda, Cheloniellida, Aglaspidida sensu lato and Trilobitomorpha form a clade (Artiopoda Hou and Bergström, 1997) nested within the mandibulate stem‐lineage, thus discarding previous interpretations of these taxa as part 'of the chelicerate stem‐group (Arachnomorpha Heider, 1913). The results confirm an aglaspidid identity for several recently described arthropods, including Quasimodaspis brentsae, Tremaglaspis unite, Chlupacaris dubia, Australaglaspis stonyensis and an unnamed Ordovician Chinese arthropod. The problematic Bohemian arthropod Kodymirus vagans was recovered as sister taxon to Beckwithia typa, and both form a small clade that falls outside Aglaspidida sensu stricto, thus discarding eurypterid affinities for the former. The analysis does not support the phylogenetic position of Kwanyinaspis maotianshanensis at the base of Conciliterga as proposed in recent studies, but rather occupies a basal position within Aglaspidida sensu lato. The results indicate a close association of aglaspidid arthropods with xenopods (i.e. Emeraldella and Sidneyia) and cheloniellids (e.g. Cheloniellon, Duslia); the new clade “Vicissicaudata” is proposed to encompass these arthropods, which are characterized by a differentiated posterior region. The phylogenetic position of aglaspidid arthropods makes them good outgroup candidates for analysing the internal relationships within the groups that form Trilobitomorpha. This work provides a much clearer picture of the phylogenetic relationships among Lower Palaeozoic lamellipedians.
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DOI: 10.1111/j.1096-0031.2012.00413.x
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A cladistic analysis of ten genera of aglaspidids sensu stricto, six aglaspidid‐like arthropods and 42 Palaeozoic arthropod taxa indicates that Xenopoda, Cheloniellida, Aglaspidida sensu lato and Trilobitomorpha form a clade (Artiopoda Hou and Bergström, 1997) nested within the mandibulate stem‐lineage, thus discarding previous interpretations of these taxa as part 'of the chelicerate stem‐group (Arachnomorpha Heider, 1913). The results confirm an aglaspidid identity for several recently described arthropods, including Quasimodaspis brentsae, Tremaglaspis unite, Chlupacaris dubia, Australaglaspis stonyensis and an unnamed Ordovician Chinese arthropod. The problematic Bohemian arthropod Kodymirus vagans was recovered as sister taxon to Beckwithia typa, and both form a small clade that falls outside Aglaspidida sensu stricto, thus discarding eurypterid affinities for the former. The analysis does not support the phylogenetic position of Kwanyinaspis maotianshanensis at the base of Conciliterga as proposed in recent studies, but rather occupies a basal position within Aglaspidida sensu lato. The results indicate a close association of aglaspidid arthropods with xenopods (i.e. Emeraldella and Sidneyia) and cheloniellids (e.g. Cheloniellon, Duslia); the new clade “Vicissicaudata” is proposed to encompass these arthropods, which are characterized by a differentiated posterior region. The phylogenetic position of aglaspidid arthropods makes them good outgroup candidates for analysing the internal relationships within the groups that form Trilobitomorpha. 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The analysis does not support the phylogenetic position of Kwanyinaspis maotianshanensis at the base of Conciliterga as proposed in recent studies, but rather occupies a basal position within Aglaspidida sensu lato. The results indicate a close association of aglaspidid arthropods with xenopods (i.e. Emeraldella and Sidneyia) and cheloniellids (e.g. Cheloniellon, Duslia); the new clade “Vicissicaudata” is proposed to encompass these arthropods, which are characterized by a differentiated posterior region. The phylogenetic position of aglaspidid arthropods makes them good outgroup candidates for analysing the internal relationships within the groups that form Trilobitomorpha. 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A cladistic analysis of ten genera of aglaspidids sensu stricto, six aglaspidid‐like arthropods and 42 Palaeozoic arthropod taxa indicates that Xenopoda, Cheloniellida, Aglaspidida sensu lato and Trilobitomorpha form a clade (Artiopoda Hou and Bergström, 1997) nested within the mandibulate stem‐lineage, thus discarding previous interpretations of these taxa as part 'of the chelicerate stem‐group (Arachnomorpha Heider, 1913). The results confirm an aglaspidid identity for several recently described arthropods, including Quasimodaspis brentsae, Tremaglaspis unite, Chlupacaris dubia, Australaglaspis stonyensis and an unnamed Ordovician Chinese arthropod. The problematic Bohemian arthropod Kodymirus vagans was recovered as sister taxon to Beckwithia typa, and both form a small clade that falls outside Aglaspidida sensu stricto, thus discarding eurypterid affinities for the former. The analysis does not support the phylogenetic position of Kwanyinaspis maotianshanensis at the base of Conciliterga as proposed in recent studies, but rather occupies a basal position within Aglaspidida sensu lato. The results indicate a close association of aglaspidid arthropods with xenopods (i.e. Emeraldella and Sidneyia) and cheloniellids (e.g. Cheloniellon, Duslia); the new clade “Vicissicaudata” is proposed to encompass these arthropods, which are characterized by a differentiated posterior region. The phylogenetic position of aglaspidid arthropods makes them good outgroup candidates for analysing the internal relationships within the groups that form Trilobitomorpha. This work provides a much clearer picture of the phylogenetic relationships among Lower Palaeozoic lamellipedians.</p></abstract></profileDesc><revisionDesc><change when="2013-02">Published</change></revisionDesc></teiHeader></istex:fulltextTEI><json:item><extension>txt</extension><original>false</original><mimetype>text/plain</mimetype><uri>https://api.istex.fr/document/16237B14A3DDE0B499FD2808805337673A6D1B94/fulltext/txt</uri></json:item></fulltext><metadata><istex:metadataXml wicri:clean="Wiley, elements deleted: body"><istex:xmlDeclaration>version="1.0" encoding="UTF-8" standalone="yes"</istex:xmlDeclaration><istex:document><component version="2.0" type="serialArticle" xml:lang="en"><header><publicationMeta level="product"><publisherInfo><publisherName>Blackwell Publishing Ltd</publisherName><publisherLoc>Oxford, UK</publisherLoc></publisherInfo><doi origin="wiley" registered="yes">10.1111/(ISSN)1096-0031</doi><issn type="print">0748-3007</issn><issn type="electronic">1096-0031</issn><idGroup><id type="product" value="CLA"></id><id type="publisherDivision" value="ST"></id></idGroup><titleGroup><title type="main" sort="CLADISTICS">Cladistics</title></titleGroup></publicationMeta><publicationMeta level="part" position="02101"><doi origin="wiley">10.1111/cla.2013.29.issue-1</doi><numberingGroup><numbering type="journalVolume" number="29">29</numbering><numbering type="journalIssue" number="1">1</numbering></numberingGroup><coverDate startDate="2013-02">February 2013</coverDate></publicationMeta><publicationMeta level="unit" type="article" position="5" status="forIssue"><doi origin="wiley">10.1111/j.1096-0031.2012.00413.x</doi><idGroup><id type="unit" value="CLA413"></id></idGroup><countGroup><count type="pageTotal" number="31"></count></countGroup><titleGroup><title type="tocHeading1">PHYLOGENY</title></titleGroup><copyright>© The Willi Hennig Society 2012</copyright><eventGroup><event type="xmlConverted" agent="Converter:BPG_TO_WML3G version:3.1.9 mode:FullText" date="2013-01-18"></event><event type="publishedOnlineEarlyUnpaginated" date="2012-08-15"></event><event type="firstOnline" date="2012-08-15"></event><event type="publishedOnlineFinalForm" date="2013-01-18"></event><event type="xmlConverted" agent="Converter:WILEY_ML3G_TO_WILEY_ML3GV2 version:3.8.8" date="2014-01-15"></event><event type="xmlConverted" agent="Converter:WML3G_To_WML3G version:4.6.4 mode:FullText" date="2015-10-01"></event></eventGroup><numberingGroup><numbering type="pageFirst" number="15">15</numbering><numbering type="pageLast" number="45">45</numbering></numberingGroup><correspondenceTo> Corresponding author:
<i>E‐mail address:</i><email>jo314@cam.ac.uk</email></correspondenceTo><objectNameGroup><objectName elementName="appendix">Appendix</objectName></objectNameGroup><linkGroup><link type="toTypesetVersion" href="file:CLA.CLA413.pdf"></link></linkGroup></publicationMeta><contentMeta><unparsedEditorialHistory>Accepted 13 May 2012</unparsedEditorialHistory><countGroup><count type="figureTotal" number="8"></count><count type="tableTotal" number="3"></count></countGroup><titleGroup><title type="main">The phylogeny of aglaspidid arthropods and the internal relationships within Artiopoda</title><title type="shortAuthors"><i>J. Ortega‐Hernández et al.</i></title></titleGroup><creators><creator creatorRole="author" xml:id="cr1" affiliationRef="#a1 #a2" corresponding="yes"><personName><givenNames>Javier</givenNames><familyName>Ortega‐Hernández</familyName></personName></creator><creator creatorRole="author" xml:id="cr2" affiliationRef="#a2 #a3"><personName><givenNames>David A.</givenNames><familyName>Legg</familyName></personName></creator><creator creatorRole="author" xml:id="cr3" affiliationRef="#a2"><personName><givenNames>Simon J.</givenNames><familyName>Braddy</familyName></personName></creator></creators><affiliationGroup><affiliation xml:id="a1" countryCode="GB"><unparsedAffiliation>Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK</unparsedAffiliation></affiliation><affiliation xml:id="a2" countryCode="GB"><unparsedAffiliation>Department of Earth Sciences, University of Bristol, Wills Memorial Building, Queen’s Road, Bristol BS8 1RJ, UK</unparsedAffiliation></affiliation><affiliation xml:id="a3" countryCode="GB"><unparsedAffiliation>Department of Earth Science and Engineering, Imperial College London, London SW7 5AW, UK</unparsedAffiliation></affiliation></affiliationGroup><abstractGroup><abstract type="main" xml:lang="en"><title type="main">Abstract</title><p>The phylogenetic position of aglaspidids, a problematic group of Lower Palaeozoic arthropods of undetermined affinities, is re‐examined in the context of the major Cambrian and Ordovician lamellipedian arthropod groups. A cladistic analysis of ten genera of aglaspidids <i>sensu stricto</i>, six aglaspidid‐like arthropods and 42 Palaeozoic arthropod taxa indicates that Xenopoda, Cheloniellida, Aglaspidida <i>sensu lato</i> and Trilobitomorpha form a clade (Artiopoda <link href="#b71">Hou and Bergström, 1997</link>) nested within the mandibulate stem‐lineage, thus discarding previous interpretations of these taxa as part 'of the chelicerate stem‐group (Arachnomorpha <link href="#b65">Heider, 1913</link>). The results confirm an aglaspidid identity for several recently described arthropods, including <i>Quasimodaspis brentsae</i>, <i>Tremaglaspis unite</i>, <i>Chlupacaris dubia</i>, <i>Australaglaspis stonyensis</i> and an unnamed Ordovician Chinese arthropod. The problematic Bohemian arthropod <i>Kodymirus vagans</i> was recovered as sister taxon to <i>Beckwithia typa</i>, and both form a small clade that falls outside Aglaspidida <i>sensu stricto</i>, thus discarding eurypterid affinities for the former. The analysis does not support the phylogenetic position of <i>Kwanyinaspis maotianshanensis</i> at the base of Conciliterga as proposed in recent studies, but rather occupies a basal position within Aglaspidida <i>sensu lato.</i> The results indicate a close association of aglaspidid arthropods with xenopods (i.e. <i>Emeraldella</i> and <i>Sidneyia</i>) and cheloniellids (e.g. <i>Cheloniellon</i>, <i>Duslia</i>); the new clade “Vicissicaudata” is proposed to encompass these arthropods, which are characterized by a differentiated posterior region. The phylogenetic position of aglaspidid arthropods makes them good outgroup candidates for analysing the internal relationships within the groups that form Trilobitomorpha. This work provides a much clearer picture of the phylogenetic relationships among Lower Palaeozoic lamellipedians.</p></abstract></abstractGroup></contentMeta></header></component></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>The phylogeny of aglaspidid arthropods and the internal relationships within Artiopoda</title></titleInfo><titleInfo type="alternative" contentType="CDATA" lang="en"><title>The phylogeny of aglaspidid arthropods and the internal relationships within Artiopoda</title></titleInfo><name type="personal"><namePart type="given">Javier</namePart><namePart type="family">Ortega‐Hernández</namePart><affiliation>Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK</affiliation><affiliation>Department of Earth Sciences, University of Bristol, Wills Memorial Building, Queen’s Road, Bristol BS8 1RJ, UK</affiliation><affiliation>E-mail: jo314@cam.ac.uk</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">David A.</namePart><namePart type="family">Legg</namePart><affiliation>Department of Earth Sciences, University of Bristol, Wills Memorial Building, Queen’s Road, Bristol BS8 1RJ, UK</affiliation><affiliation>Department of Earth Science and Engineering, Imperial College London, London SW7 5AW, UK</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Simon J.</namePart><namePart type="family">Braddy</namePart><affiliation>Department of Earth Sciences, University of Bristol, Wills Memorial Building, Queen’s Road, Bristol BS8 1RJ, UK</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="article" displayLabel="article"></genre><originInfo><publisher>Blackwell Publishing Ltd</publisher><place><placeTerm type="text">Oxford, UK</placeTerm></place><dateIssued encoding="w3cdtf">2013-02</dateIssued><edition>Accepted 13 May 2012</edition><copyrightDate encoding="w3cdtf">2013</copyrightDate></originInfo><language><languageTerm type="code" authority="rfc3066">en</languageTerm><languageTerm type="code" authority="iso639-2b">eng</languageTerm></language><physicalDescription><internetMediaType>text/html</internetMediaType><extent unit="figures">8</extent><extent unit="tables">3</extent></physicalDescription><abstract lang="en">The phylogenetic position of aglaspidids, a problematic group of Lower Palaeozoic arthropods of undetermined affinities, is re‐examined in the context of the major Cambrian and Ordovician lamellipedian arthropod groups. A cladistic analysis of ten genera of aglaspidids sensu stricto, six aglaspidid‐like arthropods and 42 Palaeozoic arthropod taxa indicates that Xenopoda, Cheloniellida, Aglaspidida sensu lato and Trilobitomorpha form a clade (Artiopoda Hou and Bergström, 1997) nested within the mandibulate stem‐lineage, thus discarding previous interpretations of these taxa as part 'of the chelicerate stem‐group (Arachnomorpha Heider, 1913). The results confirm an aglaspidid identity for several recently described arthropods, including Quasimodaspis brentsae, Tremaglaspis unite, Chlupacaris dubia, Australaglaspis stonyensis and an unnamed Ordovician Chinese arthropod. The problematic Bohemian arthropod Kodymirus vagans was recovered as sister taxon to Beckwithia typa, and both form a small clade that falls outside Aglaspidida sensu stricto, thus discarding eurypterid affinities for the former. The analysis does not support the phylogenetic position of Kwanyinaspis maotianshanensis at the base of Conciliterga as proposed in recent studies, but rather occupies a basal position within Aglaspidida sensu lato. The results indicate a close association of aglaspidid arthropods with xenopods (i.e. Emeraldella and Sidneyia) and cheloniellids (e.g. Cheloniellon, Duslia); the new clade “Vicissicaudata” is proposed to encompass these arthropods, which are characterized by a differentiated posterior region. The phylogenetic position of aglaspidid arthropods makes them good outgroup candidates for analysing the internal relationships within the groups that form Trilobitomorpha. This work provides a much clearer picture of the phylogenetic relationships among Lower Palaeozoic lamellipedians.</abstract><relatedItem type="host"><titleInfo><title>Cladistics</title></titleInfo><genre type="journal">journal</genre><identifier type="ISSN">0748-3007</identifier><identifier type="eISSN">1096-0031</identifier><identifier type="DOI">10.1111/(ISSN)1096-0031</identifier><identifier type="PublisherID">CLA</identifier><part><date>2013</date><detail type="volume"><caption>vol.</caption><number>29</number></detail><detail type="issue"><caption>no.</caption><number>1</number></detail><extent unit="pages"><start>15</start><end>45</end><total>31</total></extent></part></relatedItem><identifier type="istex">16237B14A3DDE0B499FD2808805337673A6D1B94</identifier><identifier type="DOI">10.1111/j.1096-0031.2012.00413.x</identifier><identifier type="ArticleID">CLA413</identifier><accessCondition type="use and reproduction" contentType="copyright">© The Willi Hennig Society 2012</accessCondition><recordInfo><recordContentSource>WILEY</recordContentSource><recordOrigin>Blackwell Publishing Ltd</recordOrigin></recordInfo></mods></metadata><serie></serie></istex></record>Pour manipuler ce document sous Unix (Dilib)
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