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Journal of Micropalaeontology An open-access journal of The Micropalaeontological Society
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Volume 17, issue 2
J. Micropalaeontol., 17, 97–103, 1998
https://doi.org/10.1144/jm.17.2.97
© Author(s) 1998. This work is distributed under
the Creative Commons Attribution 4.0 License.
J. Micropalaeontol., 17, 97–103, 1998
https://doi.org/10.1144/jm.17.2.97
© Author(s) 1998. This work is distributed under
the Creative Commons Attribution 4.0 License.

  01 Dec 1998

01 Dec 1998

On the evolution of the Hedbergellidae from the Praehedbergellidae

M. K. Boudagher-Fadel1, F. T. Banner1,4, T. N. Gorbachik2, M. D. Simmons3, and J. E. Whittaker4 M. K. Boudagher-Fadel et al.
  • 1Postgraduate Micropalaeontology Unit, Department of Geological Sciences, University College London, Gower Street, London WC1E 6BT, UK
  • 2Department of Palaeontology, Geological Faculty, Moscow State University, Vorobiovy Gory, 119899 Moscow, Russia
  • 3Department of Geology & Petroleum Geology, University of Aberdeen, Aberdeen AB9 2UE, UK
  • 4Department of Palaeontology, The Natural History Museum, Cromwell Road, London SW7 5BD, UK

Abstract. In order to establish the relationship between the smooth, microperforate praehedbergellid forms of the genus Blefuscuiana with the younger, macroperforate and muricate forms typical of Hedbergella, two similar taxa but with the different characters of the two genera, are studied here: Blefuscuiana praetrocoidea (Kretchmar & Gorbachik) and its descendant Hedbergella trocoidea (Gandolfi), the type species of Hedbergella, and which typifies the Hedbergellidae.

B. praetrocoidea was only found in the Early Aptian in the North Tethys. H. trocoidea ranges from the Late Aptian to Early Albian (?M. Albian) and is a cosmopolitan species. It evolves into Ticinella roberti (Gandolfi), a Late Aptian–Albian species with fused portici. The evolution of the Praehedbergellidae into the Hedbergellidae appears to be related to a relative sea-level rise in the Late Aptian and Albian (and the opening of the Proto-Atlantic) which provided a number of deep-water niches which the Hedbergellidae occupied.

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