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

  • Peter Cederstrom
  • Per Ahlberg
  • Loren Babcock
  • John Ahlgren
  • Magne Hoyberget
  • Carin H. Nilsson
Publishing year: 2012
Language: English
Pages: 157-171
Publication/Series: GFF
Volume: 134
Issue: 3
Document type: Journal article
Publisher: Taylor & Francis

Abstract 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.


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


  • ISSN: 2000-0863
Per Ahlberg
E-mail: per [dot] ahlberg [at] geol [dot] lu [dot] se


Lithosphere and Biosphere Science

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