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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
Publishing year: 2015
Language: English
Pages: 477-487
Publication/Series: Alcheringa
Volume: 39
Issue: 4
Document type: Journal article
Publisher: Taylor & Francis

Abstract 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.

Keywords

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

Other

Published
  • ISSN: 0311-5518
Per Ahlberg
E-mail: per [dot] ahlberg [at] geol [dot] lu [dot] se

Professor

Lithosphere and Biosphere Science

+46 46 222 78 70

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