A New Early Triassic Gastropod Genus and the Recovery of Gastropods from the Permian/Triassic Extinction

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A new Early Triassic gastropod genus and the recovery of gastropods from the Permian/Triassic extinction Alexander Nützel Acta Palaeontologica Polonica 50 (1), 2005: 19-24 The common Early Triassic (Olenekian) gastropod Turbo rectecostatus from the upper Werfen Formation of the Alps is placed in the new genus Werfenella. Elimination of the wrong or outdated generic assignments of Late Palaeozoic and Early Mesozoic gastropods to archetypical genera such as Turbo, Trochus, or Natica (all with Recent type species) represents an important step toward understanding the evolutionary history of the gastropods across the Permian/Triassic mass-extinction event. The first appearance of Werfenella in the Olenekian, as well as the origination of other groups of gastropods, suggests an early turnover in the aftermath of the end-Permian mass extinction event. The relatively large size of Werfenella (up to 35 mm) sheds doubt on assertions that all Early Triassic gastropods are microgastropods (Lilliput effect). The new genus is placed in the caenogastropod family Purpurinidae and represents its earliest occurrence. However, a placement of Werfenella in the Archaeogastropoda (Vetigastropoda) is also possible because it resembles the paraturbinid genus Chartronella. The characteristic Werfenella rectecostata-Natiria costata gastropod association from the Werfen Formation is not found in the approximately contemporaneous Sinbad Limestone of the Moenkopi Formation (Utah, USA) nor elsewhere outside Europe. This suggests that the similarities between Olenekian gastropod faunas from the Tethys and western North America are more limited than previously thought. Key words: Gastropoda, Purpurinidae, Permian/Triassic mass extinction, Olenekian, Werfen Formation, Alps. Alexander Nützel [[email protected]−erlangen.de], Universität Erlangen, Institut für Paläontologie, Loewenichstr. 28, D−91054 Erlangen, Germany. This is an open-access article distributed under the terms of the Creative Commons Attribution License (for details please see creativecommons.org), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Full text (338.0 kB) Powered by TCPDF (www.tcpdf.org).

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