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Arthrorhachis Hawle and Corda, 1984 (Agnostida) in the Prague Basin (Barrandian area, Czech Republic) revisited

Author(s): Budil P | Fatka O | Kolář P | David M

Journal: Bulletin of Geosciences
ISSN 1214-1119

Volume: 86;
Issue: 4;
Start page: 707;
Date: 2011;
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Keywords: Agnostida | Upper Ordovician | Prague Basin | Barrandian area | Czech Republic

The agnostid Arthrorhachis Hawle and Corda, 1847 from the Prague Basin (type area of its occurrence, including type species of the genus) is revised. The taxonomic position of all earlier established type specimens is clarified. All available material, including recently collected specimens, is described and discussed. The glabellar impressions are described for the first time on material from the Barrandian area. The stratigraphical distribution of the two established species, A. tarda (Barrande, 1846) and A. pragensis (Přibyl and Vaněk, 1968) is evaluated. Although Arthrorhachis belongs to the latest agnostids, its representatives are locally common in the dark coloured siltstones of the Zahořany, Bohdalec and especially Králův Dvůr formations (upper Sandbian–upper Katian interval). In the Prague Basin, the last specimen of Arthrorhachis seem to persist up to the onset of the Hirnantian glaciation. The classical concept of the so-called "Lejškov facies" characteristic by comparatively abundant agnostids is discussed.
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