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Per Ahlberg, Skottland 2013

Per Ahlberg

Professor emeritus

Per Ahlberg, Skottland 2013

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

Författare

  • Per Ahlberg
  • John Ahlgren

Summary, in 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.

Avdelning/ar

  • Berggrundsgeologi

Publiceringsår

2000

Språk

Engelska

Sidor

91-96

Publikation/Tidskrift/Serie

Acta Palaeontologica Polonica

Volym

45

Issue

1

Dokumenttyp

Artikel i tidskrift

Förlag

Instytut Paleobiologii PAN

Ämne

  • Geology

Nyckelord

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

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 0567-7920