Molecular systematics of eastern North American Phalangodidae (Arachnida: Opiliones: Laniatores), demonstrating convergent morphological evolution in caves
The phalangodid harvestmen (Opiliones: Laniatores) fauna of the southeastern United States has remained obscure since original descriptions of many genera and species over 60 years ago. The obscurity of this interesting group is pervasive, with uncertainty regarding basic systematic information such...
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description | The phalangodid harvestmen (Opiliones: Laniatores) fauna of the southeastern United States has remained obscure since original descriptions of many genera and species over 60
years ago. The obscurity of this interesting group is pervasive, with uncertainty regarding basic systematic information such as generic limits, species limits, and geographic distributions. This situation is unfortunate, as the fauna includes several cave-obligate forms of interest from both conservation and evolutionary perspectives, and the group likely exhibits interesting biogeographic patterns because of their low dispersal ability. Here, we use DNA sequence data from two genes to reconstruct phylogenetic relationships of southeastern phalangodid taxa, for a sample of all described genera from the region. Our results demonstrate that the southeastern fauna is likely monophyletic, and is most-closely related to western North American phalangodids with a similar penis morphology. Within the southeastern clade, trends in the evolution of penis morphology correspond broadly to molecular phylogenetic patterns, although penis evolution is overall relatively conservative in the group. Biogeographically, it appears that western taxa in the southeast (i.e., from west of the Appalachian Valley) are early diverging, with later diversification in the montane southern Blue Ridge, and subsequent diversification back towards the west. This W
>
E
>
W pattern has been observed in other groups from the southeast. The multiple cave-modified species in the region are genetically divergent and appear phylogenetically isolated; explicit topological hypothesis testing suggests that troglomorphism has evolved convergently in at least three independent lineages. The total number of species in the region remains uncertain—mitochondrial COI data reveal many highly divergent, geographically coherent groups that might represent undescribed species, but these divergent mitochondrial lineages do not always exhibit divergence in either nuclear sequences or penis morphology. Many questions remain, but our studies provide a solid framework for further systematic investigations of this interesting group. |
doi_str_mv | 10.1016/j.ympev.2009.08.020 |
format | Article |
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years ago. The obscurity of this interesting group is pervasive, with uncertainty regarding basic systematic information such as generic limits, species limits, and geographic distributions. This situation is unfortunate, as the fauna includes several cave-obligate forms of interest from both conservation and evolutionary perspectives, and the group likely exhibits interesting biogeographic patterns because of their low dispersal ability. Here, we use DNA sequence data from two genes to reconstruct phylogenetic relationships of southeastern phalangodid taxa, for a sample of all described genera from the region. Our results demonstrate that the southeastern fauna is likely monophyletic, and is most-closely related to western North American phalangodids with a similar penis morphology. Within the southeastern clade, trends in the evolution of penis morphology correspond broadly to molecular phylogenetic patterns, although penis evolution is overall relatively conservative in the group. Biogeographically, it appears that western taxa in the southeast (i.e., from west of the Appalachian Valley) are early diverging, with later diversification in the montane southern Blue Ridge, and subsequent diversification back towards the west. This W
>
E
>
W pattern has been observed in other groups from the southeast. The multiple cave-modified species in the region are genetically divergent and appear phylogenetically isolated; explicit topological hypothesis testing suggests that troglomorphism has evolved convergently in at least three independent lineages. The total number of species in the region remains uncertain—mitochondrial COI data reveal many highly divergent, geographically coherent groups that might represent undescribed species, but these divergent mitochondrial lineages do not always exhibit divergence in either nuclear sequences or penis morphology. Many questions remain, but our studies provide a solid framework for further systematic investigations of this interesting group.</description><identifier>ISSN: 1055-7903</identifier><identifier>EISSN: 1095-9513</identifier><identifier>DOI: 10.1016/j.ympev.2009.08.020</identifier><identifier>PMID: 19699807</identifier><language>eng</language><publisher>United States: Elsevier Inc</publisher><subject>Animals ; Arachnida ; Arachnida - anatomy & histology ; Arachnida - classification ; Arachnida - genetics ; Bayes Theorem ; Convergence ; Cryophilic taxa ; Cryptic species ; DNA, Mitochondrial - genetics ; DNA, Ribosomal - genetics ; Environment ; Evolution, Molecular ; Genetic Variation ; Historical biogeography ; Laniatores ; Male ; Opiliones ; Phalangodidae ; Phylogeny ; Sequence Alignment ; Sequence Analysis, DNA ; Southeastern United States ; Southern Appalachians ; Species delimitation</subject><ispartof>Molecular phylogenetics and evolution, 2010, Vol.54 (1), p.107-121</ispartof><rights>2009 Elsevier Inc.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c454t-2ab0e24da16ca97e9a2b9c9d39bd21feb755a96cfbb2aa5a2d952c3501717d403</citedby></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.ympev.2009.08.020$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,780,784,3550,4024,27923,27924,27925,45995</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/19699807$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Hedin, Marshal</creatorcontrib><creatorcontrib>Thomas, Steven M.</creatorcontrib><title>Molecular systematics of eastern North American Phalangodidae (Arachnida: Opiliones: Laniatores), demonstrating convergent morphological evolution in caves</title><title>Molecular phylogenetics and evolution</title><addtitle>Mol Phylogenet Evol</addtitle><description>The phalangodid harvestmen (Opiliones: Laniatores) fauna of the southeastern United States has remained obscure since original descriptions of many genera and species over 60
years ago. The obscurity of this interesting group is pervasive, with uncertainty regarding basic systematic information such as generic limits, species limits, and geographic distributions. This situation is unfortunate, as the fauna includes several cave-obligate forms of interest from both conservation and evolutionary perspectives, and the group likely exhibits interesting biogeographic patterns because of their low dispersal ability. Here, we use DNA sequence data from two genes to reconstruct phylogenetic relationships of southeastern phalangodid taxa, for a sample of all described genera from the region. Our results demonstrate that the southeastern fauna is likely monophyletic, and is most-closely related to western North American phalangodids with a similar penis morphology. Within the southeastern clade, trends in the evolution of penis morphology correspond broadly to molecular phylogenetic patterns, although penis evolution is overall relatively conservative in the group. Biogeographically, it appears that western taxa in the southeast (i.e., from west of the Appalachian Valley) are early diverging, with later diversification in the montane southern Blue Ridge, and subsequent diversification back towards the west. This W
>
E
>
W pattern has been observed in other groups from the southeast. The multiple cave-modified species in the region are genetically divergent and appear phylogenetically isolated; explicit topological hypothesis testing suggests that troglomorphism has evolved convergently in at least three independent lineages. The total number of species in the region remains uncertain—mitochondrial COI data reveal many highly divergent, geographically coherent groups that might represent undescribed species, but these divergent mitochondrial lineages do not always exhibit divergence in either nuclear sequences or penis morphology. Many questions remain, but our studies provide a solid framework for further systematic investigations of this interesting group.</description><subject>Animals</subject><subject>Arachnida</subject><subject>Arachnida - anatomy & histology</subject><subject>Arachnida - classification</subject><subject>Arachnida - genetics</subject><subject>Bayes Theorem</subject><subject>Convergence</subject><subject>Cryophilic taxa</subject><subject>Cryptic species</subject><subject>DNA, Mitochondrial - genetics</subject><subject>DNA, Ribosomal - genetics</subject><subject>Environment</subject><subject>Evolution, Molecular</subject><subject>Genetic Variation</subject><subject>Historical biogeography</subject><subject>Laniatores</subject><subject>Male</subject><subject>Opiliones</subject><subject>Phalangodidae</subject><subject>Phylogeny</subject><subject>Sequence Alignment</subject><subject>Sequence Analysis, DNA</subject><subject>Southeastern United States</subject><subject>Southern Appalachians</subject><subject>Species delimitation</subject><issn>1055-7903</issn><issn>1095-9513</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2010</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNqFkd-q1DAQh4sonuPRJxAkV6Jga5I27eaAF8vBf7B6vNDrME2mu1naZE3Swj6LL2vWXfBOrzKBb75h5lcUzxmtGGXt2311nA64VJxSWdFVRTl9UFwzKkUpBasfnmohyk7S-qp4EuOeUsaEFI-LKyZbKVe0uy5-ffEj6nmEQOIxJpwgWR2JHwhC_gZHvvqQdmQ9YbAaHPm2gxHc1htrAMmrdQC9c7m-JfcHO1rvMN6SDTgLyQeMr98Qg5N3MYVsdluivVswbNElMvlw2PnRb7N4JLj4cU5ZQKwjGhaMT4tHA4wRn13em-LHh_ff7z6Vm_uPn-_Wm1I3okklh54ibwywVoPsUALvpZamlr3hbMC-EwJkq4e-5wACuJGC61pQ1rHONLS-KV6evYfgf84Yk5ps1DjmPdHPUdVtQymv2_-CnNWsadtVBuszqIOPMeCgDsFOEI6KUXUKT-3Vn_DUKTxFVyqHl7teXPRzP6H523NJKwPvzgDmaywWg4raotNobECdlPH2nwN-A9ufsLk</recordid><startdate>2010</startdate><enddate>2010</enddate><creator>Hedin, Marshal</creator><creator>Thomas, Steven M.</creator><general>Elsevier Inc</general><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7SS</scope><scope>7U5</scope><scope>8FD</scope><scope>L7M</scope></search><sort><creationdate>2010</creationdate><title>Molecular systematics of eastern North American Phalangodidae (Arachnida: Opiliones: Laniatores), demonstrating convergent morphological evolution in caves</title><author>Hedin, Marshal ; Thomas, Steven M.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c454t-2ab0e24da16ca97e9a2b9c9d39bd21feb755a96cfbb2aa5a2d952c3501717d403</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2010</creationdate><topic>Animals</topic><topic>Arachnida</topic><topic>Arachnida - anatomy & histology</topic><topic>Arachnida - classification</topic><topic>Arachnida - genetics</topic><topic>Bayes Theorem</topic><topic>Convergence</topic><topic>Cryophilic taxa</topic><topic>Cryptic species</topic><topic>DNA, Mitochondrial - genetics</topic><topic>DNA, Ribosomal - genetics</topic><topic>Environment</topic><topic>Evolution, Molecular</topic><topic>Genetic Variation</topic><topic>Historical biogeography</topic><topic>Laniatores</topic><topic>Male</topic><topic>Opiliones</topic><topic>Phalangodidae</topic><topic>Phylogeny</topic><topic>Sequence Alignment</topic><topic>Sequence Analysis, DNA</topic><topic>Southeastern United States</topic><topic>Southern Appalachians</topic><topic>Species delimitation</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Hedin, Marshal</creatorcontrib><creatorcontrib>Thomas, Steven M.</creatorcontrib><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>Entomology Abstracts (Full archive)</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>Technology Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Molecular phylogenetics and evolution</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Hedin, Marshal</au><au>Thomas, Steven M.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Molecular systematics of eastern North American Phalangodidae (Arachnida: Opiliones: Laniatores), demonstrating convergent morphological evolution in caves</atitle><jtitle>Molecular phylogenetics and evolution</jtitle><addtitle>Mol Phylogenet Evol</addtitle><date>2010</date><risdate>2010</risdate><volume>54</volume><issue>1</issue><spage>107</spage><epage>121</epage><pages>107-121</pages><issn>1055-7903</issn><eissn>1095-9513</eissn><abstract>The phalangodid harvestmen (Opiliones: Laniatores) fauna of the southeastern United States has remained obscure since original descriptions of many genera and species over 60
years ago. The obscurity of this interesting group is pervasive, with uncertainty regarding basic systematic information such as generic limits, species limits, and geographic distributions. This situation is unfortunate, as the fauna includes several cave-obligate forms of interest from both conservation and evolutionary perspectives, and the group likely exhibits interesting biogeographic patterns because of their low dispersal ability. Here, we use DNA sequence data from two genes to reconstruct phylogenetic relationships of southeastern phalangodid taxa, for a sample of all described genera from the region. Our results demonstrate that the southeastern fauna is likely monophyletic, and is most-closely related to western North American phalangodids with a similar penis morphology. Within the southeastern clade, trends in the evolution of penis morphology correspond broadly to molecular phylogenetic patterns, although penis evolution is overall relatively conservative in the group. Biogeographically, it appears that western taxa in the southeast (i.e., from west of the Appalachian Valley) are early diverging, with later diversification in the montane southern Blue Ridge, and subsequent diversification back towards the west. This W
>
E
>
W pattern has been observed in other groups from the southeast. The multiple cave-modified species in the region are genetically divergent and appear phylogenetically isolated; explicit topological hypothesis testing suggests that troglomorphism has evolved convergently in at least three independent lineages. The total number of species in the region remains uncertain—mitochondrial COI data reveal many highly divergent, geographically coherent groups that might represent undescribed species, but these divergent mitochondrial lineages do not always exhibit divergence in either nuclear sequences or penis morphology. Many questions remain, but our studies provide a solid framework for further systematic investigations of this interesting group.</abstract><cop>United States</cop><pub>Elsevier Inc</pub><pmid>19699807</pmid><doi>10.1016/j.ympev.2009.08.020</doi><tpages>15</tpages></addata></record> |
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subjects | Animals Arachnida Arachnida - anatomy & histology Arachnida - classification Arachnida - genetics Bayes Theorem Convergence Cryophilic taxa Cryptic species DNA, Mitochondrial - genetics DNA, Ribosomal - genetics Environment Evolution, Molecular Genetic Variation Historical biogeography Laniatores Male Opiliones Phalangodidae Phylogeny Sequence Alignment Sequence Analysis, DNA Southeastern United States Southern Appalachians Species delimitation |
title | Molecular systematics of eastern North American Phalangodidae (Arachnida: Opiliones: Laniatores), demonstrating convergent morphological evolution in caves |
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