Paläontologische Zeitschrift

, Volume 86, Issue 3, pp 275–280

A complete styginid trilobite from the Ordovician of Sweden

Research Paper

Abstract

Styginidae are a small group of trilobite species, which are usually rare and most of which are incompletely known. Here we describe a complete specimen of Raymondaspisgrandigena n.sp. from the Middle Ordovician (Darriwilian, upper Arenig) of Sweden. Among the group it has an unusual combination of exceptionally large genal spines, a thorax with notably short pleural spines in the anterior tergites, and a wide concave pygidial margin. The hypostome is documented for the first time in situ in a styginid, and its attachment can be best described as semi-impendent.

Keywords

Styginidae Raymondaspis Trilobita Ordovician Sweden 

Kurzfassung

Styginidae sind eine kleine Gruppe vornehmlich seltener Trilobitenarten die zumeist unvollständig bekannt sind. Hier beschreiben wir ein vollständiges Exemplar von Raymondaspis grandigena n. sp. aus dem Mittelordovizium (Darriwilium, oberes Arenigium) von Schweden. Die Art hat eine für die Gruppe aussergewöhnliche Kombination von grossen Wangenstacheln, einem Thorax mit besonders kurzen Pleuralstacheln an den vorderen Tergiten und einen breiten Saum des Pygidium. Das Hypostom wird zum ersten mal in situ dokumentiert und kann am besten als semi-impendent bezeichnet werden.

Schlüsselwörter

Styginidae Raymondaspis Trilobita Ordovizium Schweden 

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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  1. 1.Natural History Museum of DenmarkCopenhagen UniversityCopenhagenDenmark
  2. 2.Swedish Museum of Natural HistoryStockholmSweden

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