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PalZ

, Volume 92, Issue 4, pp 605–615 | Cite as

First find of aptychi of Leioceras and Bredyia (Ammonoidea, Hildoceratoidea) in the Aalenian of Northern Caucasus, Russia

  • Vasily V. Mitta
  • Günter SchweigertEmail author
  • Mikhail P. Sherstyukov
  • Volker Dietze
Research Paper
  • 82 Downloads

Abstract

Aptychi are reported from the Lower Aalenian Leioceras opalinum Zone and Subzone of the Khussa-Kardonik section in Karachay-Cherkessia (Kuban River Basin). They are associated with conchs of the ammonites genera Leioceras and Bredyia (superfamily Hildoceratoidea) and interpreted as their lower jaws. The Hildoceratoidea aptychi are referred to a form group defined by Trauth as ‘cornaptychi’. Wide valves with a straight apical angle (morph I) probably belong to Bredyia. Aptychi with an acute apical angle (wide in the basal part; morph II) and relatively narrow ones (morph III) belong to macroconchs and microconchs of Leioceras, respectively. Aptychi assignable to Leioceras opalinum are herein also reported from Southern Germany.

Keywords

Aalenian Ammonites Cephalopod jaws Aptychi Cornaptychi Leioceras Bredyia Northern Caucasus Southern Germany 

Notes

Acknowledgements

This study was supported by the Program of Presidium of the Russian Academy of Sciences no. 28. Roman Rakitov (Paleontological Institute, Moscow) helped with the SEM photography (Tescan Vega). The English text was checked by M.V.L. Barclay (Natural History Museum, London). The authors are sincerely grateful to everyone who assisted in this work. Finally, our cordial thanks go to the journal’s referees Horacio Parent (University of Rosario, Argentina) and an anonymous one as well as the responsible editors Christian Klug (University of Zurich, Switzerland) and Mike Reich (SNSB-BSPG Munich, Germany).

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Copyright information

© Paläontologische Gesellschaft 2018

Authors and Affiliations

  • Vasily V. Mitta
    • 1
    • 2
  • Günter Schweigert
    • 3
    Email author
  • Mikhail P. Sherstyukov
    • 4
  • Volker Dietze
    • 5
  1. 1.Borissiak Paleontological Institute of the Russian Academy of SciencesMoscowRussia
  2. 2.Cherepovets State UniversityCherepovetsRussia
  3. 3.Staatliches Museum für NaturkundeStuttgartGermany
  4. 4.North Caucasus Federal University, Institute of Oil and GasStavropolRussia
  5. 5.NördlingenGermany

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