Kurzfassung
Die GattungCancelloceras (Fam. Gastrioceratidae) umfaßt die drei UntergattungenCancelloceras, Crencelloceras n. subgen. undMonitoceras, die sich hauptsächlich durch Skulptur-Merkmale unterscheiden.Cancelloceras ist kosmopolitisch und gilt als Leitgattung des Ober-Namurs (G1, Yeadonium). Die Untergrenze der G1-Stufe ist durch das Auftreten vonCancelloceras (Crencelloceras) branneroides definiert; die ältesten Angehörigen der Gattung setzten schon in der R2-Zone des Mittel-Namurs ein. Die Obergrenze der G1-Zone wird durch das Aussterben vonCancelloceras und das Einsetzen der Folge-GattungGastrioceras markiert.Cancelloceras umfaßt derzeit 27 Arten.
Abstract
The genusCancelloceras (family Gastrioceratidae) comprises three subgeneraCancelloceras, Crencelloceras n. subgen. andMonitoceras differing in conch ornamentation.Cancelloceras is cosmopolitan and regarded as the index genus for the Upper Namurian G1 Zone, the Yeadonian. The lower boundary of the G1 Zone is defined by the entry ofCancelloceras (Crencelloceras) branneroides, whereas the first representatives of the genus appeared earlier, in the Middle Namurian R2 Zone. The upper boundary of the G1 Zone is marked by the extinction ofCancelloceras and the entry of its descendant genusGastrioceras. Cancelloceras comprises 27 species.
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Nikolaeva, S.V., Kullmann, J. The Late Namurian genusCancelloceras (Carboniferous Ammonoidea) and its distribution. Paläontol. Z. 69, 353–376 (1995). https://doi.org/10.1007/BF02987800
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DOI: https://doi.org/10.1007/BF02987800