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Lotagnostus? : mystacinus, a rare agnostid from the Upper Cambrian of Sweden

Author:
  • Per Ahlberg
  • John Ahlgren
Publishing year: 2000
Language: English
Pages: 91-96
Publication/Series: Acta Palaeontologica Polonica
Volume: 45
Issue: 1
Document type: Journal article
Publisher: Instytut Paleobiologii PAN

Abstract english

Agnostids afford the best means of correlating Cambrian strata, and they are widely used for intercontinental correlations. They are most common in open-marine deposits and reached a maximum diversity during the Middle and early Late Cambrian. About twenty species of agnostids are known from the Upper Cambrian of Scandinavia. Lotagnostus? mystacinus Tjernvik, 1953 is a rare agnostid from the Upper Cambrian Agnostus pisiformis Zone of south-central Sweden. It is redescribed following examination of the holotype and an additional pygidium. The outline and morphology of especially the pygidial posteroaxis, which is distinctly trilobate by a pair of deep notular furrows, suggest that the species is best classified as a species of Lotagnostus. If correctly assigned to Lotagnostus, it would be the oldest known species of that genus.

Keywords

  • Geology
  • cambrian
  • morphology
  • phylogeny
  • taxonomy
  • Sweden
  • Agnostida
  • Trilobita

Other

Published
  • ISSN: 0567-7920
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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