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Mats Eriksson

Mats Eriksson

Professor

Mats Eriksson

Silurian scolecodonts

Författare

  • Mats Eriksson
  • CF Bergman
  • Lennart Jeppsson

Summary, in English

Scolecodonts, polychaete jaws, generally occur abundantly in Silurian shallow marine successions and are known from all continents except Antarctica. The assemblages are typically characterized by taxa with labidognath, placognath and prionognath type jaw apparatuses. They commonly include species of Kettnerites Zebera, 1935, Oenonites Hinde, 1879, Mochtyella Kielan-Jaworowska, 1961, Protarabellites Stauffer, 1933, Atraktoprion Kielan-Jaworowska, 1962, Pistoprion Kielan-Jaworowska, 1966, Vistulella Kielan-Jaworowska, 1961, Xanioprion Kielan-Jaworowska, 1962, Kalloprion Kielan-Jaworowska, 1962, and Leptoprion Kielan-Jaworowska, 1966. Less common genera, such as Hadoprion Eriksson and Bergman, 1998, Symmetroprion Kielan-Jaworowska, 1966 and Rhytiprion Kielan-Jaworowska, 1966, generally are recorded only from very large collections and/or suitable facies. Many of the common genera, as well as a few species, have been identified in several regions, particularly in Baltica and Laurentia, and evidently had a broad, intercontinental distribution. However, the scolecodont record from regions at higher paleolatitudes, i.e. Gondwana and peripheral paleoplates, is meager. In the famous latest Llandovery to latest Ludlow succession of Gotland, Sweden, scolecodonts are one of the most common microfossil groups, with abundances reaching thousands of specimens/kg rock. Based on an extensive collection, approximately one hundred jawed polychaete species belonging to at least 28 genera and a dozen families have been identified. Polychaetaspids, paulinitids and mochtyellids dominate. The exceptionally rare genus Synclinophora Eisenack, 1975, may belong to the family Oenonidae. If so, this is the only extant family represented in Silurian strata. The diversity patterns and temporal and stratigaphic distribution related to facies reveal that the assemblages house eurytopic as well as stenotopic taxa. Both long-ranging taxa, embracing the entire succession and beyond, and short-ranging taxa, occur. Like other metazoan groups, jawed polychaetes were affected by the documented Silurian extinction events. During the globally recognized late Ludlow Lau Event, approximately one third of the identified polychaete taxa went extinct, and some lineages show Lazarus gaps on Gotland. (C) 2004 Elsevier B.V. All rights reserved.

Avdelning/ar

  • Berggrundsgeologi

Publiceringsår

2004

Språk

Engelska

Sidor

269-300

Publikation/Tidskrift/Serie

Review of Palaeobotany and Palynology

Volym

131

Issue

3-4

Dokumenttyp

Artikel i tidskrift

Förlag

Elsevier

Ämne

  • Geology

Nyckelord

  • Polychaete jaws
  • polychaeta
  • scolecodonts
  • Silurian

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 0034-6667