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Revision and new data on the Coniacian ammonite genus Hemitissotia in the Iberian Peninsula (Spain and Portugal)

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Abstract

The types of the species of the Coniacian ammonite genus Hemitissotia Peron, 1897, identified in the Iberian Peninsula (Spain and Portugal), which are currently held in the Wiedmann (Universität Tübingen, Germany) and Choffat (Instituto Geológico e Mineiro, Portugal) collections, have been revised and refigured. New specimens of the taxa Hemitissotia ceadouroensis Choffat, 1898, Hemitissotia celtiberica Wiedmann, 1975b, Hemitissotia turzoi Karrenberg, 1935, Hemitissotia dullai (Karrenberg 1935) and Hemitissotia lenticeratiformis Wiedmann in Wiedmann and Kauffman, 1978 have also been presented. As results, H. celtiberica has been considered as a junior synonym of H. ceadouroensis, and the lectotype of this species and the neotypes of H. turzoi and H. dullai have been designated and figured. Additionally, the geographical and stratigraphical distributions of all of these species have been determined with precision, and several phylogenetic relationships between them have been identified, revealing morphologies that become progressively smaller and more depressed and ornamented (hydrodynamically less efficient), interpreted as an adaptative response to sea-level changes.

Kurzfassung

Die Typen der Arten der Ammoniten-Gattung Hemitissotia Peron, 1897 aus dem Coniacium der Iberischen Halbinsel (Spanien und Portugal) wurden neu bearbeitet und abgebildet. Sie befinden sich heute in den Sammlungen von Wiedmann (Universität Tübingen, Deutschland) und Choffat (Instituto Geológico e Mineiro, Portugal). Neue Exemplare von Hemitissotia ceadouroensis Choffat, 1898, Hemitissotia celtiberica Wiedmann, 1975b, Hemitissotia turzoi Karrenberg, 1935, Hemitissotia dullai (Karrenberg 1935) und Hemitissotia lenticeratiformis Wiedmann in Wiedmann and Kauffmann, 1978, werden ebenfalls dargestellt. Dabei zeigt sich, dass H. celtiberica ein jüngeres Synonym von H. ceadouroensis ist. Der Lectotyp dieser Arten sowie die Neotypen von H. turzoi und H. dullai werden definiert und abgebildet. Die geographische und stratigraphische Verbreitung der erwähnten Arten werden detailliert dargestellt, wie auch die phylogenetischen Beziehungen. Sie weisen eine zunehmend kleinere, flachere und stärker verzierte Morphologie auf, was hydrodynamisch weniger effizient ist und scheinbare eine Anpassung an Änderungen des Meeresspiegels darstellen.

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Acknowledgments

Authors appreciate the help offered by Prof. Dr. Philipe Havlik from the Institut und Museum für Geologie und Paläontologie der Universität Tübingen, Germany, and by Prof. Dr. Miguel Magalhães Ramalho from the Museu do Instituto Geológico e Mineiro de Lisboa, Portugal, with the studies of the types held in their respective institutions, and by D. Florencio Aparicio Alonso, from Hoyos del Tozo, Spain, with the donation of several specimens he collected. We also recognise the collaboration of Prof. Dr. José García-Hidalgo and Prof. Dr. Javier Gil from the Universidad de Alcalá de Henares, Spain, and Ricardo Paredes from the Universidade de Coimbra, Portugal, with the field work, and the useful comments of Prof. Dr. Ricardo Martínez from the Universitat Autònoma de Barcelona, Spain, and Prof. Dr. Markus Wilmsen from the Universität Würzburg, Germany, as reviewers of the original manuscript. Authors thank the Centro de Geofísica da Universidade de Coimbra (FCT—Foundation of Science and Technology), Portugal, for its support. This study was carried out within the projects PEII11-0237-7926 of the Junta de Castilla-La Mancha, and CGL2009-12008 and CGL2011-25894 of the Ministerio de Ciencia e Innovación, Spain.

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  1. Departamento de Paleontología, Universidad Complutense de Madrid, 28040, Madrid, Spain

    Fernando Barroso-Barcenilla

  2. Grupo de Investigación IBERCRETA, Universidad de Alcalá de Henares, 28871, Alcalá de Henares, Spain

    Fernando Barroso-Barcenilla & Manuel Segura

  3. Departamento de Ciências da Terra, Universidade de Coimbra, 3000-272, Coimbra, Portugal

    Pedro Miguel Callapez

  4. Centro de Geofísica, Universidade de Coimbra, 3000-134, Coimbra, Portugal

    Pedro Miguel Callapez

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Correspondence to Fernando Barroso-Barcenilla.

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Barroso-Barcenilla, F., Callapez, P.M. & Segura, M. Revision and new data on the Coniacian ammonite genus Hemitissotia in the Iberian Peninsula (Spain and Portugal). Paläontol Z 87, 201–217 (2013). https://doi.org/10.1007/s12542-012-0151-3

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