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Paläontologische Zeitschrift

, 83:521 | Cite as

The systematic position of the Lower Cretaceous heteromorphic ammonite Pictetia Uhlig, 1883

  • René Hoffmann
  • Helmut Keupp
  • Frank WieseEmail author
Research Paper

Abstract

The heteromorphic ammonite genus Pictetia has previously been included in the Lytoceratidae. A reassessment of literature data and a detailed analysis of the suture shows that Pictetia lacks a septal lobe as well as a bifid internal lobe and lateral lobe, all features indicative of the Lytoceratidae. This and the quadrilobate suture line, combined with the loose coiling of the shell, indicate that it should be included in the polyphyletic suborder “Ancyloceratina”. Any further systematic assessment is impossible at the moment.

Keywords

Lower Cretaceous Aptian Albian Ammonoidea Ancyloceratina Systematic Suture 

Abbreviations

MAo

Keupp Collection, housed at Freie Universität Berlin

PIMUZ

Paläontologisches Institut und Museum der Universität Zürich

BMNH

The Natural History Museum, London

wh

Whorl height

wb

Whorl breadth

Kurzfassung

Bisher wurde die heteromorphe Ammonitengattung Pictetia zu den Lytoceratidae gestellt. Die Auswertung von Literaturdaten sowie genaue Untersuchungen der Suturlinie zeigen, dass die charakteristischen Merkmale der Lytoceratidae, wie der Septallobus, ein bifider Intern- und Laterallobus, bei Pictetia nicht ausgebildet sind. Dies und die quadrilobate Suturlinie sowie das lose aufgewundene Gehäuse erfordern eine systematische Zuordnung zur polyphyletischen Gruppe der „Ancyloceratina”. Eine nähere taxonomische Einordnung ist zur Zeit nicht möglich.

Schlüsselwörter

Unterkreide Aptium Albium Ammonoidea Ancyloceratina Systematik Sutur 

Notes

Acknowledgments

Hoffmann acknowledges financial support by the DFG (Ke 322/32-1). We thank M. Bulang-Lörcher (FU Berlin) for suture line drawings and J. Evers (FU Berlin) for photographic works. We are grateful to C. Klug and H. Furrer (ETH Zurich) for providing the material from the Föllmi collection. Many thanks to V.J. Roden (Göttingen) for smoothening the English. We are indebted to the referees P. Bengtson (Heidelberg) and J. Lehmann (Bremen) for their keen and insightful reviews.

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Authors and Affiliations

  1. 1.Institut für Geologische Wissenschaften, Fachrichtung PaläontologieFreie Universität BerlinBerlinGermany

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