Paleozoic echinoderm hangovers: waking up in the Triassic

Ben Thuy, Hans Hagdorn, Andy S. Gale

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    Abstract

    Echinoderms are among the marine invertebrates that underwent the most severe losses at the end-Permian extinction. The prevailing paradigm claims an extreme bottleneck with only very few, if not single, holdovers (“hangovers” herein) sparking the post-Paleozoic radiation. Here we identify previously overlooked Triassic echinoids, ophiuroids, and asteroids as unambiguous members of Paleozoic stem groups. These echinoderm hangovers occurred almost worldwide and had spread into a wide range of paleoenvironments by the Late Triassic. Our discovery challenges fundamentals of echinoderm evolution with respect to end-Permian survival and sheds new light on the early evolution of the modern clades, in particular on Triassic ghost lineages (i.e., inferred but undocumented fossil record) of the crown-group look-alikes of the Paleozoic hangovers.
    Original languageEnglish
    Pages (from-to)531-534
    Number of pages5
    JournalGeology
    Volume45
    Issue number6
    Early online date16 Mar 2017
    DOIs
    Publication statusPublished - 1 Jun 2017

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