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Middle Ordovician (Darriwilian) radiolarians from the Crawford Group, Scotland

  • Siyumini Perera (a1), Jonathan C. Aitchison (a1) and Linda Nothdurft (a1)


A diverse assemblage of moderately well-preserved radiolarians occurs in the Ordovician cherts of the Crawford Group in the Southern Uplands terrane of the Scottish borders. A total of 8 genera and 11 species are described. Taxa present correlate to the Middle Ordovician Pygodus anserinus biozone. Key species identified include: Proventocitum procerulum, Inanigutta gansuensis, Inanigutta sp. cf. I. complanata, Inanibigutta sp. cf. I. verrucula, Inanibigutta sp. cf. I. pinglianensis, ?Inanibigutta inconstans, ?Inanihella penrosei, Haplentactinia armillata, ?Oriundogutta ramificans and Syntagentactinia sp. A new species Haplotaeniatum albaensis is introduced here and described on the basis of details of skeletal architecture observed using microcomputed tomography, demonstrating the potential of this technique as a tool for improving the understanding of radiolarian taxonomy.


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Author for correspondence: S. Perera, Email:


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Middle Ordovician (Darriwilian) radiolarians from the Crawford Group, Scotland

  • Siyumini Perera (a1), Jonathan C. Aitchison (a1) and Linda Nothdurft (a1)


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