Late Devonian (Famennian) phacopid trilobites from western Mongolia
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ORIGINAL PAPER
Late Devonian (Famennian) phacopid trilobites from western Mongolia C. Crônier 1
&
M. Ariuntogos 2,3
&
P. Königshof 2 & J. A. Waters 4 & S. K. Carmichael 4
Received: 29 May 2020 / Revised: 22 July 2020 / Accepted: 23 July 2020 # Senckenberg Gesellschaft für Naturforschung and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The early Famennian phacopid trilobites Feistops mongoliensis gen. nov. sp. nov., Feistops khovdensis gen. nov. sp. nov., ?Feistops sp. A, and ?Houseops olonbulagensis sp. nov. are recorded and illustrated from the western Mongolia Hushoot Shiveetiin gol section from the Baruunhuurai Terrane of the Central Asian Orogenic Belt (CAOB). In this section, exposing large parts of cyclic Famennian shallow-water siliciclastic shelf deposits, Feistops mongoliensis gen. nov. sp. nov., Feistops khovdensis gen. nov. sp. nov., ?Feistops sp. A, and ?Houseops olonbulagensis sp. nov. are the first known and described representatives of trilobites from Late Devonian deposits of western Mongolia. Their affinities with known other sighted species of the same age are discussed. Keywords Central Asian Orogenic Belt (CAOB) . Trilobites . Phacopidae . Devonian . Palaeobiogeography . Biodiversity hotspot
Introduction A major goal in macroevolution is to understand patterns of diversity fluctuations in organisms. Among organisms, according to their taxonomic, morphological, and behavioral diversity, trilobites constitute a model to study such diversity evolution (Crônier 2010). Trilobites were relatively abundant and diverse in marine habitats in the mid-Palaeozoic, a time of dynamic longterm climate change (Algeo and Scheckler 1998; Stein et al. 2007; Becker et al. 2016) triggering significant biodiversity changes and major biotic crisis (Sepkoski 1996; Racki 2005;
This is a contribution to a special series on The Central Asian Orogenic Belt (CAOB) during Late Devonian: new insights from southern Mongolia. * C. Crônier [email protected] 1
Université de Lille, CNRS, UMR 8198 Évo-Éco-Paléo, F-59000 Lille, France
2
Senckenberg Research Institute and Natural History Museum, Senckenberganlage 25, 60325 Frankfurt, Germany
3
Mongolian University of Science and Technology, Baga Toiruu, Sukhbaatar District, Ulaanbaatar, Mongolia
4
Department of Geological and Environmental Sciences, Appalachian State University, 572 Rivers St., Boone, NC 28608, USA
Bond and Grasby 2017). In particular, the Late Devonian period is important for the development of the phacopid trilobites because the main groups of reduced eyed or blind phacopids arose at that time, especially in deeper offshore cephalopod limestones, after a severe diversity restriction triggering one of the highest extinction rates in the Late Palaeozoic (Lerosey-Aubril and Feist 2012; Crônier et al. 2013; Crônier and François 2014). The trilobite record remains scarce in shallow near-shore environments due to relatively few studies dealing with shallow-water sections. Recently, Feist (2019) made a challenge to upd
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