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Transverse serial sections in three shells of Beaussetithyris assymmetrica nov. sp. from Basse-Provence, France. A. Specimen MNHN.F.A70940 from Le Beausset (length: 24.1, width: 23.1, thickness: 15.3 mm). B. Specimen MNHN.F.S09134 from Le Beausset, revealing a translation of the sub-asymmetrical shape of the anterior commissure. C. Specimen MNHN.F.A70941 from Les Martigues (length: 33.1, width: 31.8, thickness: 22.9 mm). Line drawings: D. Gaspard.
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