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New trepostome Bryozoa from the Early Triassic (Smithian/Spathian) of Nevada

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Kurzfassung

Zwei neue Bryozoen-Arten der Familie Dyscritellidae (Trepostomata),Dyscritellopsis thaynesianus n. sp. undDyscritellopsis montelloensis n. sp., werden aus den Thaynes Kalken der unteren Trias (Smithian/Spathian) von Nevada (USA) beschrieben. Die Bryozoen-Fauna liefert weiteren Beleg für das Überleben paläozoischer Stammlinien in frühest triadischer Zeit auf den offenen Schelfen der Nordhemisphere außerhalb der Tropen. Sie zeigt paläobiogeo-graphische Beziehungen zu Faunen der Unteren Trias von Spitsbergen.

Abstract

Two new bryozoan species of the trepostome family Dyscritellidae,Dyscritellopsis thaynesianus n. sp. andDyscritellopsis montelloensis n. sp., are described from the Early Triassic (Smithian/Spathian) Thaynes Limestone, Nevada (USA). The bryozoan fauna documents the survival of Paleozoic lineages into the earliest Triassic on northern open shelves outside the tropics. The fauna holds paleobiogeo-graphic connections to the Early Triassic bryozoan faunas of Spitsbergen.

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Correspondence to Priska Schäfer.

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Schäfer, P., Cuffey, R.J. & Albert, R.Y. New trepostome Bryozoa from the Early Triassic (Smithian/Spathian) of Nevada. Paläontol Z 77, 323–340 (2003). https://doi.org/10.1007/BF03006945

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Schlüsselwörter

  • Trepostomata
  • Smithium/Spathium
  • Nordost Nevada
  • Thaynes Kalke
  • Systematik
  • Paläobiogeographie
  • Überlebende

Keywords

  • Trepostomata
  • Smithian/Spathian
  • Northeast Nevada
  • Thaynes Limestone
  • systematics
  • paleobiogeography
  • mass extinction survivors.