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Per Ahlberg

Per Ahlberg

Professor

Per Ahlberg

Morphology, ontogeny and distribution of the Cambrian Series 2 ellipsocephalid trilobite Strenuaeva spinosa from Scandinavia

Author

  • Peter Cederstrom
  • Per Ahlberg
  • Loren Babcock
  • John Ahlgren
  • Magne Hoyberget
  • Carin H. Nilsson

Summary, in English

The ellipsocephalid trilobite Strenuaeva spinosa occurs widely in Scandinavia in the lower part of the Ornamentaspis? linnarssoni Zone (Cambrian Series 2). Its first appearance is a readily recognisable, widespread biohorizon in Scandinavia. During ontogeny, intergenal spines are lost and the librigenae develop from a generative zone in the genal region. The palpebro-ocular ridges are distinct and connected to the posterior part of the frontal glabellar lobe in the early meraspid period, but eye ridges become separate from the palpebral lobes and the glabella in the late meraspid period. S. spinosa is characterised by large genal spines, distinct axial spines and falcate pleural tips. The spines may have functioned in predation resistance. S. spinosa also has a small pointed projection at the anterolateral corners of some thoracic pleurae, the function of which is unknown. The presence of five furrows in the cephalic axial lobe of S. spinosa, best expressed in meraspides, suggests that the head of this ellipsocephalid trilobite was composed of six fused primary segments.

Department/s

  • Lithosphere and Biosphere Science

Publishing year

2012

Language

English

Pages

157-171

Publication/Series

GFF

Volume

134

Issue

3

Document type

Journal article

Publisher

Taylor & Francis

Topic

  • Geology

Keywords

  • trilobite
  • ellipsocephalid
  • biostratigraphy
  • morphology
  • ontogeny
  • Cambrian

Status

Published

ISBN/ISSN/Other

  • ISSN: 2000-0863