Chaetocladus gracilis n. sp., a non-calcified Dasycladales from the Upper Silurian of Skåne, Sweden

Paul Kenrick*, Jakob Vinther

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

17 Citations (Scopus)

Abstract

A rare non-calcified dasycladalean alga Chaetocladus gracilis n. sp. is described from the Upper Silurian (Ludlow) Bjärsjölagård Limestone (Klinta Formation; Øved-Ramsåsa Group), Skåne, Sweden. C. gracilis comprises a slender rod-like thallus with euspondyl, acrophorous laterals arrayed in more or less equally spaced verticils. In its morphology Chaetocladus converges on several other groups of contemporaneous flora (e.g., charalean algae, land plants) and fauna (e.g., graptolites), and the potential of misattributing dasyclads of this type to other groups such as green algae and in particular to land plants is noted and discussed. The preservation of such a delicate thallus suggests that special taphonomic conditions prevailed over parts of the Bjärsjölagård Limestone, involving rapid burial in anoxic mud and low levels of bioturbation. The presence of Chaetocladus is also indicative of an unusual floral/faunal assemblage that has been termed a 'thallophytic-alga-dominated biota'. Assemblages of this type are characterized by thallophytic algae, annelid worms, lightly sclerotized arthropods and a low diversity shelly fauna.

Original languageEnglish
Pages (from-to)153-160
Number of pages8
JournalReview of Palaeobotany and Palynology
Volume142
Issue number3-4
DOIs
Publication statusPublished - 1 Dec 2006

Keywords

  • Chaetocladus
  • Charales
  • Dasycladales
  • Graptolite
  • Silurian
  • Sweden

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