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Cyclothyris grimargina nov. sp. from the Campanian of Les Charentes and Dordogne, France (Arnaud coll.). A–C. Dorsal, lateral and anterior views of the holotype SU.PAL.2018.0.55.19.1 from Caillaud, Charente-Maritime. D–F. Specimen SU.PAL.2018.0.55.11.28 from Charente. G,H. Specimen SU.PAL.2018.0.55.11.29 from Charente. I–K. Specimen SU.PAL.2018.0.55.28.1 from Périgueux. L–O. Specimen SU.PAL.2018.0.55.28.3 from Périgueux with close-up view of the conjunct deltidial plates (O, see white arrow). P. Close-up view of costae and elementary growth marks on them revealed on specimen SU.PAL.2018.0.55.28.6 from Périgueux. Scale bars = 5 mm, except (O, P) = 2 mm. Photographs: P. Loubry.
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