A Cambrian–Ordovician Terrestrialization of Arachnids
Understanding the temporal context of terrestrialization in chelicerates depends on whether terrestrial groups, the traditional Arachnida, have a single origin and whether or not horseshoe crabs are primitively or secondarily marine. Molecular dating on a phylogenomic tree that recovers arachnid mon...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2020-03-01
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| Series: | Frontiers in Genetics |
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| Online Access: | https://www.frontiersin.org/article/10.3389/fgene.2020.00182/full |
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| author | Jesus Lozano-Fernandez Jesus Lozano-Fernandez Alastair R. Tanner Mark N. Puttick Jakob Vinther Jakob Vinther Gregory D. Edgecombe Davide Pisani Davide Pisani |
| author_facet | Jesus Lozano-Fernandez Jesus Lozano-Fernandez Alastair R. Tanner Mark N. Puttick Jakob Vinther Jakob Vinther Gregory D. Edgecombe Davide Pisani Davide Pisani |
| author_sort | Jesus Lozano-Fernandez |
| collection | DOAJ |
| description | Understanding the temporal context of terrestrialization in chelicerates depends on whether terrestrial groups, the traditional Arachnida, have a single origin and whether or not horseshoe crabs are primitively or secondarily marine. Molecular dating on a phylogenomic tree that recovers arachnid monophyly, constrained by 27 rigorously vetted fossil calibrations, estimates that Arachnida originated during the Cambrian or Ordovician. After the common ancestor colonized the land, the main lineages appear to have rapidly radiated in the Cambrian–Ordovician boundary interval, coinciding with high rates of molecular evolution. The highest rates of arachnid diversification are detected between the Permian and Early Cretaceous. A pattern of ancient divergence estimates for terrestrial arthropod groups in the Cambrian while the oldest fossils are Silurian (seen in both myriapods and arachnids) is mirrored in the molecular and fossil records of land plants. We suggest the discrepancy between molecular and fossil evidence for terrestrialization is likely driven by the extreme sparseness of terrestrial sediments in the rock record before the late Silurian. |
| first_indexed | 2024-12-19T07:34:24Z |
| format | Article |
| id | doaj.art-3d87eb49da5e4c839e9c90111886f681 |
| institution | Directory Open Access Journal |
| issn | 1664-8021 |
| language | English |
| last_indexed | 2024-12-19T07:34:24Z |
| publishDate | 2020-03-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Genetics |
| spelling | doaj.art-3d87eb49da5e4c839e9c90111886f6812022-12-21T20:30:36ZengFrontiers Media S.A.Frontiers in Genetics1664-80212020-03-011110.3389/fgene.2020.00182495961A Cambrian–Ordovician Terrestrialization of ArachnidsJesus Lozano-Fernandez0Jesus Lozano-Fernandez1Alastair R. Tanner2Mark N. Puttick3Jakob Vinther4Jakob Vinther5Gregory D. Edgecombe6Davide Pisani7Davide Pisani8School of Biological Sciences, University of Bristol, Bristol, United KingdomSchool of Earth Sciences, University of Bristol, Bristol, United KingdomSchool of Biological Sciences, University of Bristol, Bristol, United KingdomDepartment of Biology and Biochemistry, Milner Centre for Evolution, University of Bath, Bath, United KingdomSchool of Biological Sciences, University of Bristol, Bristol, United KingdomSchool of Earth Sciences, University of Bristol, Bristol, United KingdomDepartment of Earth Sciences, Natural History Museum, London, United KingdomSchool of Biological Sciences, University of Bristol, Bristol, United KingdomSchool of Earth Sciences, University of Bristol, Bristol, United KingdomUnderstanding the temporal context of terrestrialization in chelicerates depends on whether terrestrial groups, the traditional Arachnida, have a single origin and whether or not horseshoe crabs are primitively or secondarily marine. Molecular dating on a phylogenomic tree that recovers arachnid monophyly, constrained by 27 rigorously vetted fossil calibrations, estimates that Arachnida originated during the Cambrian or Ordovician. After the common ancestor colonized the land, the main lineages appear to have rapidly radiated in the Cambrian–Ordovician boundary interval, coinciding with high rates of molecular evolution. The highest rates of arachnid diversification are detected between the Permian and Early Cretaceous. A pattern of ancient divergence estimates for terrestrial arthropod groups in the Cambrian while the oldest fossils are Silurian (seen in both myriapods and arachnids) is mirrored in the molecular and fossil records of land plants. We suggest the discrepancy between molecular and fossil evidence for terrestrialization is likely driven by the extreme sparseness of terrestrial sediments in the rock record before the late Silurian.https://www.frontiersin.org/article/10.3389/fgene.2020.00182/fullArachnidaChelicerataterrestrializationCambrianmolecular clocksdiversification |
| spellingShingle | Jesus Lozano-Fernandez Jesus Lozano-Fernandez Alastair R. Tanner Mark N. Puttick Jakob Vinther Jakob Vinther Gregory D. Edgecombe Davide Pisani Davide Pisani A Cambrian–Ordovician Terrestrialization of Arachnids Frontiers in Genetics Arachnida Chelicerata terrestrialization Cambrian molecular clocks diversification |
| title | A Cambrian–Ordovician Terrestrialization of Arachnids |
| title_full | A Cambrian–Ordovician Terrestrialization of Arachnids |
| title_fullStr | A Cambrian–Ordovician Terrestrialization of Arachnids |
| title_full_unstemmed | A Cambrian–Ordovician Terrestrialization of Arachnids |
| title_short | A Cambrian–Ordovician Terrestrialization of Arachnids |
| title_sort | cambrian ordovician terrestrialization of arachnids |
| topic | Arachnida Chelicerata terrestrialization Cambrian molecular clocks diversification |
| url | https://www.frontiersin.org/article/10.3389/fgene.2020.00182/full |
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