On the evolution of the Hedbergellidae from the Praehedbergellidae

  • Boudagher-Fadel M
  • Banner F
  • Gorbachik T
  • et al.
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Abstract

<p><strong>Abstract.</strong> In order to establish the relationship between the smooth, microperforate praehedbergellid forms of the genus <i>Blefuscuiana</i> with the younger, macroperforate and muricate forms typical of <i>Hedbergella,</i> two similar taxa but with the different characters of the two genera, are studied here: <i>Blefuscuiana praetrocoidea</i> (Kretchmar &amp;amp; Gorbachik) and its descendant <i>Hedbergella trocoidea</i> (Gandolfi), the type species of <i>Hedbergella,</i> and which typifies the Hedbergellidae.<br/><br/><i>B. praetrocoidea</i> was only found in the Early Aptian in the North Tethys. <i>H. trocoidea</i> ranges from the Late Aptian to Early Albian (?M. Albian) and is a cosmopolitan species. It evolves into <i>Ticinella roberti</i> (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.</p>

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Boudagher-Fadel, M. K., Banner, F. T., Gorbachik, T. N., Simmons, M. D., & Whittaker, J. E. (1998). On the evolution of the Hedbergellidae from the Praehedbergellidae. Journal of Micropalaeontology, 17(2), 97–103. https://doi.org/10.1144/jm.17.2.97

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