Arnaud Brayard1, Alexander Nützel2, Daniel A. Stephen3, Kevin G. Bylund4, Jim Jenks5 and Hugo Bucher6,7
1UMR 5561 CNRS Biogéosciences, Université de Bourgogne, 21000 Dijon, France. Solo usuarios registrados se encuentran habilitados a visualizar los enlaces. Gracias por su visita..
2Bayerische Staatssammlung für Paläontologie und Geologie, Ludwig-Maximilians-University Munich, Department für Geo- und Umweltwissenschaften, Sektion für Paläontologie, 80333 München, Germany
3Department of Earth Science, Utah Valley University, Orem, Utah 84058, USA
4140 South 700 East, Spanish Fork, Utah 84660, USA
51134 Johnson Ridge Lane, West Jordan, Utah 84084, USA
6Paläontologisches Institut und Museum, Universität Zürich, 8006 Zürich, Switzerland
7Department of Earth Sciences, ETH Zürich, Switzerland
Abstract
Size reduction in the aftermath of the Permian-Triassic mass extinction event has repeatedly been described for various marine organisms, including gastropods (the Lilliput effect). A Smithian gastropod assemblage from Utah, USA, reveals numerous large-sized specimens of different genera as high as 70 mm, the largest ever reported from the Early Triassic. Other gastropods reported from Serbia and Italy are also as large as 35 mm. Size frequency distributions of the studied assemblages indicate that they were not unusually small when compared with later Mesozoic and modern faunas. The occurrence of large-sized gastropods less than 2 Ma after the Permian-Triassic mass extinction refutes the Lilliput hypothesis in this clade, at least for the last ∼75% of the Early Triassic.
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