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Paläontologische Zeitschrift

, Volume 67, Issue 3–4, pp 261–285 | Cite as

Silurian (Ludlow) acastid trilobites from Gotland and Scania, Sweden

  • Lars Ramsköld Stockholm
  • Gregory D. Edgecombe
Article

Abstract

Acastid trilobites from Ludlow strata on Gotland include three stratigraphically non-overlapping species ofAcastella Reed:Acastella madidipes n. sp. (Hemse Marl and Eke Beds),A. breviceps (Angelin 1851) (Burgsvik Beds), andA. amatrix n. sp. (Hamra Beds, and probably Burgsvik Beds). Type and other material ofA. breviceps (Angelin) from the Klinta Formation, Scania, is revised. Meraspid and early holaspid material ofAcastella is described. Some characters supportAcaste and allied taxa of mostly Wenlock age as a monophyletic subfamily Acastinae.Acastella as widely recognized is a grade with Devonian species more closely related to Asteropyginae than to the Ludlow type species. Baltic Ludlow-Př00ED;dolí species previously placed inScotiella Delo form a distinct group,Ewacaste n. gen., that includes a species from the uppermost Eke Beds on Gotland.

Keywords

Dorsal View Spinosa Genal Angle Cephalon Internal Mould 
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

Acastide Trilobiten aus dem Ludlow von Gotland enthalten drei stratigraphisch nicht überlappende Arten vonAcastella Reed:A. madidipes n. sp. (Hemse Mergel und Eke Schichten),A. breviceps (Angelin 1851) (Burgsvik Schichten) undA. amatrix n. sp. (Hamra Schichten und wahrscheinlich Burgsvik Schichten). Das Typenmaterial sowie weiteres Material vonA, breviceps (Angelin) aus der Klinta Formation in Schonen wird revidiert. Meraspiden- und frühe Holaspiden-Stadien vonAcastella werden beschrieben. Einige Merkmale sprechen dafür, daßAcaste und verwandte Taxa vorwiegend aus dem Wenlock zur monophyletischen Unterfamilie Acastinae gehören.Acastella ist nach gängiger Auffassung eine Entwicklungslinie, deren devonische Arten enger mit den Asteropyginae verwandt sind als mit der Typus-Art aus dem Ludlow. Baltische Arten aus dem Ludlow-Pridoli, die früher zuScotiella Delo gestellt wurden, bilden eine eigene Gruppe,Ewacaste n. gen., zu der auch eine Art aus den obersten Eke Schichten Gotlands gehört.

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Copyright information

© E. Schweizerbart’sche Verlagsbuchhandlung 1993

Authors and Affiliations

  • Lars Ramsköld Stockholm
    • 1
    • 2
  • Gregory D. Edgecombe
    • 3
    • 4
  1. 1.Sektionen för PalaeozoologiNaturhistoriska RiksmuseetStockholmSweden
  2. 2.Department of Historical Geology & PalaeontologyUniversity of UppsalaUppsalaSweden
  3. 3.Department of GeologyUniversity of AlbertaEdmontonCanada
  4. 4.Division of Earth SciencesAustralian MuseumSydney SouthAustralia

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