Article: Upper Llandeilo brachiopods from the Berwyn hills, north Wales
A. R. MacGregor
Twenty-one species are described and figured, including the following new species, Corineorthis bicon-vexa, McEwanella berwynensis, Glyptorthis minor, Atelelasma anatolica, Horderleyella subcarinata, Oxoplecia nantensis, Parastrophinella parva, Parastrophinella costata, and Rafinesquina simplex. Macrocoelia llandeiloensis (Davidson) is redescribed from topotype material as Davidson's original material appears to be lost.The fauna described was collected from three small inliers of Llandeilo rocks in the Berwyn Dome, North Wales. The fauna is composed of two elements, an indigenous element whose ancestors are to be seen in older rocks in the Anglo-Welsh Province and an exotic element. Within the exotic element various species appear to be migrants from the Scotto-Appalachian Province, the Baltic Province, and the Bohemian Province. One species must at present be regarded as cryptogenetic.