First find of aptychi of <Emphasis Type="Italic">Leioceras</Emphasis> and <Emphasis Type="Italic">Bredyia</Emphasis> (Ammonoidea,Hildoceratoidea) in the Aalenian of Northern Caucasus,Russia |
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| Authors: | Vasily V Mitta Günter Schweigert Mikhail P Sherstyukov Volker Dietze |
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| Institution: | 1.Borissiak Paleontological Institute of the Russian Academy of Sciences,Moscow,Russia;2.Cherepovets State University,Cherepovets,Russia;3.Staatliches Museum für Naturkunde,Stuttgart,Germany;4.North Caucasus Federal University, Institute of Oil and Gas,Stavropol,Russia;5.N?rdlingen,Germany |
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| 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. |
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