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Per Ahlberg

Per Ahlberg

Professor emeritus

Per Ahlberg

The ontogeny of Ellipsocephalus (Trilobita) and systematic position of Ellipsocephalidae

Author

  • Lukas Laibl
  • Oldrich Fatka
  • Petr Budil
  • Per Ahlberg
  • Michal Szabad
  • Vaclav Vokac
  • Vladislav Kozak

Summary, in English

Laibl, L., Fatka, O., Budil, P., Ahlberg, P., Szabad, M., Voka, V. & Kozak, V., 24.3.2015. The ontogeny of Ellipsocephalus (Trilobita) and systematic position of Ellipsocephalidae. Alcheringa 39, 477-487. ISSN 0311-5518.Well-preserved early holaspid stages of the Cambrian Series 3 trilobites Ellipsocephalus hoffi (Schlotheim, 1823) and Ellipsocephalus polytomus Linnarsson, 1877 have been discovered in the Pibram-Jince Basin (Czech Republic) and Jamtland (Sweden), respectively. Both species show remarkable morphological changes during late ontogeny. The earliest holaspides share long genal spines, and long macrospines on the second thoracic segment. Whereas macrospines disappear abruptly in later stages, genal spines are progressively shortened. Consequently, the ontogeny of trilobites of Ellipsocephalidae is revised. The morphology of early meraspid cranidia and ontogenetic patterns in the disappearance of macrospines suggest that this family is closely related to members of Redlichiida rather than Ptychopariida.

Department/s

  • Lithosphere and Biosphere Science

Publishing year

2015

Language

English

Pages

477-487

Publication/Series

Alcheringa

Volume

39

Issue

4

Document type

Journal article

Publisher

Taylor & Francis

Topic

  • Geology

Keywords

  • Ellipsocephalidae
  • Trilobita
  • ontogeny
  • Cambrian
  • Pibram-Jince Basin
  • Jamtland

Status

Published

ISBN/ISSN/Other

  • ISSN: 0311-5518