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PalZ

, Volume 68, Issue 1–2, pp 89–115 | Cite as

Revision of the silurian encrinurine trilobiteWallacia lamont 1978, with species from Gotland and Canada

  • Lars Ramsköld
  • Gregory D. Edgecombe
Article

Abstract

A group of late Llandovery and, exceptionally, earliest Wenlock encrinurine trilobites from the Baltic area, the British Isles, and Canada, is recognized as monophyletic. The generic nameWallacia Lamont 1978 is available for this group.Wallacia is regarded as sister taxon toEncrinurus sensu stricto. A systematic revision of species from Gotland recognizesW. laevis (Angelin 1851), from the Upper Visby Beds, andW. jaanussoni n. sp. andW. masterleei n. sp. from the Lower Visby Beds. Cladograms based on seventeen characters for the ten named species ofWallacia placeW. masterleei andW. laevis as the closest relatives of a Canadian Telychian clade that includesW. elegantula (Billings 1866),W. chattertoni n. sp., andW. hypolepra (Stearn 1956).

Keywords

Dorsal View Genal Spine Palpebral Lobe Border Furrow Facial Suture 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Kurzfassung

Eine Gruppe von Encrinurinae (Trilobiten) aus dem späten Llandovery und ausnahmsweise frühesten Wenlock des Baltikums, der Britischen Inseln und Kanadas wird als monophyletisch erkannt und mit dem GattungsnamenWallacia Lamont 1978 belegt.Wallacia wird als Schwestergruppe vonEncrinurus sensu stricto betrachtet. Eine Revision der Arten von Gotland führt zur Ausscheidung vonW. laevis (Angelin 1851) aus den Oberen Visby-Schichten, sowie vonW. jaanussoni n. sp. undW. masterleei n. sp. aus den Unteren Visby-Schichten. Auf siebzehn Merkmale beruhende Cladogramme der zehn benannten Arten vonWallacia zeigenW. masterleei undW. laevis als die nächsten Verwandten einer Gruppe aus dem Telychium Kanadas, zu derW. elegantula (Billings 1866),W. chattertoni n. sp. undW. hypolepra (Stearn 1956) gehören.

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Copyright information

© E. Schweizerbart’sche Verlagsbuchhandlung 1994

Authors and Affiliations

  • Lars Ramsköld
    • 1
  • Gregory D. Edgecombe
    • 2
  1. 1.Palaeontological MuseumUniversity of UppsalaUppsalaSweden
  2. 2.Department of GeologyUniversity of AlbertaEdmontonCanada

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