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Abstract
The taxonomic diversity of the Opiliones fauna of Canada is reviewed and summarised. At present, 36 native and seven non-native species have been documented in Canada using traditional morphological taxonomy, although more than 20 species may remain undiscovered based on species diversity in the adjacent United States and evidence from DNA barcoding. Consequently, the native fauna is yet to be fully explored and the number, distribution and ecological effects of non-native species remain unclear. Until the 1960s, work on the Canadian Opiliones fauna was largely conducted by researchers based outside the country. From that time on, several Canadian workers became active. However, these taxonomists have now retired and no one has assumed their role. Thus, there is a need to invigorate taxonomic research on the harvestmen of Canada and for the production of easy-to-use identification tools for use by non-taxonomists.
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Affiliation(s)
- Jeffrey W. Shultz
- Department of Entomology, University of Maryland, College Park, Maryland, USAUniversity of MarylandCollege ParkUnited States of America
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2
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Shorter PL, Hennen DA, Marek PE. Cryptic diversity in Andrognathuscorticarius Cope, 1869 and description of a new Andrognathus species from New Mexico (Diplopoda, Platydesmida, Andrognathidae). Zookeys 2018:19-41. [PMID: 30283233 PMCID: PMC6168611 DOI: 10.3897/zookeys.786.27631] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2018] [Accepted: 07/28/2018] [Indexed: 11/12/2022] Open
Abstract
Andrognathus is a genus of small, thin-bodied millipedes found in deciduous forests of North America. Poorly understood, these organisms inhabit decaying wood and have morphologically conserved and difficult-to-identify sexual characters that have limited study historically. Recent use of scanning electron microscopy has uncovered variation in male genitalia that was previously unknown in the genus. The distribution of Andrognathus and the extent of this variability across the continent, however, were undocumented, and a wealth of natural history collections remained uncatalogued. Here a new species of Andrognathus is described from New Mexico, Andrognathusgrubbsisp. n., natural history collections are utilized to create a comprehensive map of the genus, and a neotype established for the type species, Andrognathuscorticarius Cope, 1869. Analysis of the cytochrome oxidase I gene (COI) for A.corticarius was completed for the type series and individuals across the species distribution, but little variation was found. Andrognathusgrubbsisp. n. joins A.corticarius and A.hoffmani Shear & Marek, 2009 as the only members of the genus.
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Affiliation(s)
- Patricia L Shorter
- Virginia Polytechnic Institute and State University, Department of Entomology, Price Hall, 170 Drillfield Drive, Blacksburg, Virginia, USA Virginia Polytechnic Institute and State University Blacksburg United States of America.,Louisiana State University, Department of Entomology & School of Renewable Natural Resources, Life Sciences Building, Forestry Lane, Baton Rouge, Louisiana, USA Louisiana State University Baton Rouge United States of America
| | - Derek A Hennen
- Virginia Polytechnic Institute and State University, Department of Entomology, Price Hall, 170 Drillfield Drive, Blacksburg, Virginia, USA Virginia Polytechnic Institute and State University Blacksburg United States of America
| | - Paul E Marek
- Virginia Polytechnic Institute and State University, Department of Entomology, Price Hall, 170 Drillfield Drive, Blacksburg, Virginia, USA Virginia Polytechnic Institute and State University Blacksburg United States of America
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3
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Fernández R, Sharma PP, Tourinho AL, Giribet G. The Opiliones tree of life: shedding light on harvestmen relationships through transcriptomics. Proc Biol Sci 2017; 284:20162340. [PMID: 28228511 PMCID: PMC5326524 DOI: 10.1098/rspb.2016.2340] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2016] [Accepted: 01/27/2017] [Indexed: 12/12/2022] Open
Abstract
Opiliones are iconic arachnids with a Palaeozoic origin and a diversity that reflects ancient biogeographic patterns dating back at least to the times of Pangea. Owing to interest in harvestman diversity, evolution and biogeography, their relationships have been thoroughly studied using morphology and PCR-based Sanger approaches to infer their systematic relationships. More recently, two studies utilized transcriptomics-based phylogenomics to explore their basal relationships and diversification, but sampling was limiting for understanding deep evolutionary patterns, as they lacked good taxon representation at the family level. Here, we analysed a set of the 14 existing transcriptomes with 40 additional ones generated for this study, representing approximately 80% of the extant familial diversity in Opiliones. Our phylogenetic analyses, including a set of data matrices with different gene occupancy and evolutionary rates, and using a multitude of methods correcting for a diversity of factors affecting phylogenomic data matrices, provide a robust and stable Opiliones tree of life, where most families and higher taxa are precisely placed. Our dating analyses using alternative calibration points, methods and analytical parameters provide well-resolved old divergences, consistent with ancient regionalization in Pangea in some groups, and Pangean vicariance in others. The integration of state-of-the-art molecular techniques and analyses, together with the broadest taxonomic sampling to date presented in a phylogenomic study of harvestmen, provide new insights into harvestmen interrelationships, as well as an overview of the general biogeographic patterns of this ancient arthropod group.
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Affiliation(s)
- Rosa Fernández
- Museum of Comparative Zoology, Department of Organismic and Evolutionary Biology, Harvard University, 26 Oxford Street, Cambridge, MA 02138, USA
| | - Prashant P Sharma
- Department of Zoology, University of Wisconsin-Madison, 352 Birge Hall, 430 Lincoln Drive, Madison, WI 53706, USA
| | - Ana Lúcia Tourinho
- Museum of Comparative Zoology, Department of Organismic and Evolutionary Biology, Harvard University, 26 Oxford Street, Cambridge, MA 02138, USA
- Instituto Nacional de Pesquisas da Amazônia, Coordenação de Biodiversidade (CBIO), Avenida André Araújo, 2936, Aleixo, CEP 69011-970, Manaus, Amazonas, Brazil
| | - Gonzalo Giribet
- Museum of Comparative Zoology, Department of Organismic and Evolutionary Biology, Harvard University, 26 Oxford Street, Cambridge, MA 02138, USA
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Derkarabetian S, Burns M, Starrett J, Hedin M. Population genomic evidence for multiple Pliocene refugia in a montane‐restricted harvestman (Arachnida, Opiliones,
Sclerobunus robustus
) from the southwestern United States. Mol Ecol 2016; 25:4611-31. [DOI: 10.1111/mec.13789] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2016] [Revised: 07/11/2016] [Accepted: 07/19/2016] [Indexed: 01/07/2023]
Affiliation(s)
- Shahan Derkarabetian
- Department of Biology San Diego State University 5500 Campanile Dr. San Diego CA 92182‐4614 USA
- Department of Biology University of California Riverside Riverside CA 92521 USA
| | - Mercedes Burns
- Department of Biology San Diego State University 5500 Campanile Dr. San Diego CA 92182‐4614 USA
| | - James Starrett
- Department of Biology San Diego State University 5500 Campanile Dr. San Diego CA 92182‐4614 USA
| | - Marshal Hedin
- Department of Biology San Diego State University 5500 Campanile Dr. San Diego CA 92182‐4614 USA
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Burns M, Starrett J, Derkarabetian S, Richart CH, Cabrero A, Hedin M. Comparative performance of double‐digest
RAD
sequencing across divergent arachnid lineages. Mol Ecol Resour 2016; 17:418-430. [DOI: 10.1111/1755-0998.12575] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2015] [Accepted: 06/23/2016] [Indexed: 11/28/2022]
Affiliation(s)
- Mercedes Burns
- Department of Biology San Diego State University 5500 Campanile Drive San Diego CA 92182 USA
| | - James Starrett
- Department of Biology San Diego State University 5500 Campanile Drive San Diego CA 92182 USA
| | - Shahan Derkarabetian
- Department of Biology San Diego State University 5500 Campanile Drive San Diego CA 92182 USA
- Department of Biology University of California 900 University Avenue Riverside CA 92521 USA
| | - Casey H. Richart
- Department of Biology San Diego State University 5500 Campanile Drive San Diego CA 92182 USA
- Department of Biology University of California 900 University Avenue Riverside CA 92521 USA
| | - Allan Cabrero
- Department of Biology San Diego State University 5500 Campanile Drive San Diego CA 92182 USA
| | - Marshal Hedin
- Department of Biology San Diego State University 5500 Campanile Drive San Diego CA 92182 USA
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6
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Starrett J, Derkarabetian S, Richart CH, Cabrero A, Hedin M. A new monster from southwest Oregon forests: Cryptomaster behemoth sp. n. (Opiliones, Laniatores, Travunioidea). Zookeys 2016:11-35. [PMID: 26877685 PMCID: PMC4740820 DOI: 10.3897/zookeys.555.6274] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2015] [Accepted: 11/15/2015] [Indexed: 12/03/2022] Open
Abstract
The monotypic genus Cryptomaster Briggs, 1969 was described based on individuals from a single locality in southwestern Oregon. The described species Cryptomasterleviathan Briggs, 1969 was named for its large body size compared to most travunioid Laniatores. However, as the generic name suggests, Cryptomaster are notoriously difficult to find, and few subsequent collections have been recorded for this genus. Here, we increase sampling of Cryptomaster to 15 localities, extending their known range from the Coast Range northeast to the western Cascade Mountains of southern Oregon. Phylogenetic analyses of mitochondrial and nuclear DNA sequence data reveal deep phylogenetic breaks consistent with independently evolving lineages. We use discovery and validation species delimitation approaches to generate and test species hypotheses, including a coalescent species delimitation method to test multi-species hypotheses. For delimited species, we use light microscopy and SEM to discover diagnostic morphological characters. Although Cryptomaster has a small geographic distribution, this taxon is consistent with other short-range endemics in having deep phylogenetic breaks indicative of species level divergences. Herein we describe Cryptomasterbehemothsp. n., and provide morphological diagnostic characters for identifying Cryptomasterleviathan and Cryptomasterbehemoth.
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Affiliation(s)
- James Starrett
- Department of Biology, 5500 Campanile Drive San Diego State University, San Diego, CA 92182, USA
| | - Shahan Derkarabetian
- Department of Biology, 5500 Campanile Drive San Diego State University, San Diego, CA 92182, USA; Department of Biology, 900 University Avenue, University of California, Riverside, Riverside, CA 92521, USA
| | - Casey H Richart
- Department of Biology, 5500 Campanile Drive San Diego State University, San Diego, CA 92182, USA; Department of Biology, 900 University Avenue, University of California, Riverside, Riverside, CA 92521, USA
| | - Allan Cabrero
- Department of Biology, 5500 Campanile Drive San Diego State University, San Diego, CA 92182, USA
| | - Marshal Hedin
- Department of Biology, 5500 Campanile Drive San Diego State University, San Diego, CA 92182, USA
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Richart CH, Hayashi CY, Hedin M. Phylogenomic analyses resolve an ancient trichotomy at the base of Ischyropsalidoidea (Arachnida, Opiliones) despite high levels of gene tree conflict and unequal minority resolution frequencies. Mol Phylogenet Evol 2015; 95:171-82. [PMID: 26691642 DOI: 10.1016/j.ympev.2015.11.010] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2015] [Revised: 09/16/2015] [Accepted: 11/13/2015] [Indexed: 11/19/2022]
Abstract
Phylogenetic resolution of ancient rapid radiations has remained problematic despite major advances in statistical approaches and DNA sequencing technologies. Here we report on a combined phylogenetic approach utilizing transcriptome data in conjunction with Sanger sequence data to investigate a tandem of ancient divergences in the harvestmen superfamily Ischyropsalidoidea (Arachnida, Opiliones, Dyspnoi). We rely on Sanger sequences to resolve nodes within and between closely related genera, and use RNA-seq data from a subset of taxa to resolve a short and ancient internal branch. We use several analytical approaches to explore this succession of ancient diversification events, including concatenated and coalescent-based analyses and maximum likelihood gene trees for each locus. We evaluate the robustness of phylogenetic inferences using a randomized locus sub-sampling approach, and find congruence across these methods despite considerable incongruence across gene trees. Incongruent gene trees are not recovered in frequencies expected from a simple multispecies coalescent model, and we reject incomplete lineage sorting as the sole contributor to gene tree conflict. Using these approaches we attain robust support for higher-level phylogenetic relationships within Ischyropsalidoidea.
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Affiliation(s)
- Casey H Richart
- Department of Biology, San Diego State University, 5500 Campanile Drive, San Diego, CA 92182, USA; Department of Biology, University of California, Riverside, CA 92521, USA.
| | - Cheryl Y Hayashi
- Department of Biology, University of California, Riverside, CA 92521, USA
| | - Marshal Hedin
- Department of Biology, San Diego State University, 5500 Campanile Drive, San Diego, CA 92182, USA
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Derkarabetian S, Hedin M. Integrative taxonomy and species delimitation in harvestmen: a revision of the western North American genus Sclerobunus (Opiliones: Laniatores: Travunioidea). PLoS One 2014; 9:e104982. [PMID: 25144370 PMCID: PMC4140732 DOI: 10.1371/journal.pone.0104982] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2014] [Accepted: 07/16/2014] [Indexed: 11/18/2022] Open
Abstract
Alpha taxonomy, and specifically the delimitation of species, is becoming increasingly objective and integrative. The use of coalescent-based methods applied to genetic data is providing new tools for the discovery and delimitation of species. Here, we use an integrative approach via a combination of discovery-based multivariate morphological analyses to detect potential new species. These potential species are then used as a priori species in hypothesis-driven validation analyses with genetic data. This research focuses on the harvestmen genus Sclerobunus found throughout the mountainous regions of western North America. Based on our analyses, we conduct a revision of Sclerobunus resulting in synonymy of Cyptobunus with Sclerobunus including transfer of S. cavicolens comb. nov. and elevation of both subspecies of S. ungulatus: S. ungulatus comb. nov. and S. madhousensis comb. nov., stat. nov. The three subspecies of S. robustus are elevated, S. robustus, S. glorietus stat. nov., and S. idahoensis stat. nov. Additionally, five new species of Sclerobunus are described from New Mexico and Colorado, including S. jemez sp. nov., S. klomax sp. nov., S. skywalkeri sp. nov., S. speoventus sp. nov., and S. steinmanni sp. nov. Several of the newly described species are single-cave endemics, and our findings suggest that further exploration of western North American cave habitats will likely yield additional new species.
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Affiliation(s)
- Shahan Derkarabetian
- Department of Biology, San Diego State University, San Diego, California, United States of America
- Department of Biology, University of California Riverside, Riverside, California, United States of America
| | - Marshal Hedin
- Department of Biology, San Diego State University, San Diego, California, United States of America
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