none 10.1144/sjg2025-016 Geological Society of London Geological Society of London 1881 188692343 94125 2026072002202400501 10.1144 2026-07-20T09:21:12Z 2026-01-16T14:49:30Z 1 Scottish Journal of Geology SJG 0036-9276 2041-4951 01 16 2026 12 2026 62 1 Neil D.L. Clark The Hunterian at Kelvin Hall, University of Glasgow, 1445 Argyll Street, Glasgow G3 8AW, UK The Geological Society of Glasgow Glasgow, UK c/o Department of Geographical and Earth Sciences Glasgow, UK University of Glasgow Glasgow, UK https://orcid.org/0000-0003-3357-0360 Gary Hoare The Geological Society of Glasgow Glasgow, UK c/o Department of Geographical and Earth Sciences Glasgow, UK University of Glasgow Glasgow, UK https://orcid.org/0000-0001-6286-1402 Marisa Privitera Murdoch The Geological Society of Glasgow Glasgow, UK c/o Department of Geographical and Earth Sciences Glasgow, UK University of Glasgow Glasgow, UK https://orcid.org/0009-0005-8635-0275 A recent discovery of Brittaniclus rankini from below the Blackhall Limestone at Blairskaith Quarry, near Torrance is described and two old-collection specimens of Cyclidae from the Hurlet Limestone at Trearne, near Beith are re-evaluated. This is the first record of Brittaniclus from the Lower Limestone Formation. Brittaniclus is already well known from the Limestone Coal Formation (Serpukhovian, Carboniferous) of the Glasgow area and from the Glencartholm Volcanic Beds (Visean, Carboniferous) and appears to represent a free-swimming marine pancrustacean that is best preserved in non-marine lagoonal shales. One of the specimens from Trearne is incomplete and is here referred to Cyclus radialis due to the well-defined thoracic ridges on the dorsal carapace. The other specimen is the first record of a new species of Magnitocyclus , a genus which has previously only been found from the Visean to Serpukhovian of Russia. It is named here as M. trearnensis sp. nov. 02 20 2026 12 2026 sjg2025-016 10.1144/sjg2025-016 1 10.1144/crossmark-policy www.lyellcollection.org true 2025-08-14 2025-10-08 2025-10-15 2026-02-20 http://creativecommons.org/licenses/by/4.0/ 10.1144/sjg2025-016 https://www.lyellcollection.org/doi/10.1144/sjg2025-016 https://www.lyellcollection.org/doi/pdf/10.1144/sjg2025-016 https://pubs.geoscienceworld.org/sjg/article/62/1/sjg2025-016/724553/a-new-occurrence-of-britanniclus-pancrustacea 10.1002/jmor.10609 Browne M.A.E. Dean M.T. Hall I.H.S. McAdam A.D. Monro S.K. and Chisholm J.I. 1999. A Lithostratigraphical Framework for the Carboniferous Rocks of the Midland Valley of Scotland. British Geological Survey Research Report RR/99/07. British Regional Geology: The Midland Valley of Scotland Cameron I.B. 1985 3 Cameron, I.B. and Stephenson, D. 1985. British Regional Geology: The Midland Valley of Scotland. 3rd edn. Reprint 2014. 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