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      Extant primitively segmented spiders have recently diversified from an ancient lineage

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          Most cited references 42

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          Global continental and ocean basin reconstructions since 200Ma

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            Recent synchronous radiation of a living fossil.

            Modern survivors of previously more diverse lineages are regarded as living fossils, particularly when characterized by morphological stasis. Cycads are often cited as a classic example, reaching their greatest diversity during the Jurassic-Cretaceous (199.6 to 65.5 million years ago) then dwindling to their present diversity of ~300 species as flowering plants rose to dominance. Using fossil-calibrated molecular phylogenies, we show that cycads underwent a near synchronous global rediversification beginning in the late Miocene, followed by a slowdown toward the Recent. Although the cycad lineage is ancient, our timetrees indicate that living cycad species are not much older than ~12 million years. These data reject the hypothesized role of dinosaurs in generating extant diversity and the designation of today's cycad species as living fossils.
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              Gondwana to Asia: Plate tectonics, paleogeography and the biological connectivity of the Indian sub-continent from the Middle Jurassic through latest Eocene (166–35 Ma)

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                Author and article information

                Journal
                Proceedings of the Royal Society B: Biological Sciences
                Proceedings of the Royal Society B: Biological Sciences
                The Royal Society
                0962-8452
                1471-2954
                May 06 2015
                May 06 2015
                : 282
                : 1808
                : 20142486
                Article
                10.1098/rspb.2014.2486
                © 2015

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