FIG. 5 in Upper Oligocene (Chattian) brachiopod fauna from the Aquitaine Basin, southwestern France and its paleoenvironmental implications

FIG. 5. — Argyrotheca bitnerae Dulai, 2011, Upper Oligocene: A, dorsal view of complete specimen, Peyrère, MNHN.F.A46513; B, C, dorsal view of complete specimen and enlargement of the umbonal part to show details of the beak, Abesse, MNHN.F.A46515; D, E, inner view of ventral valve and enlargement of umbonal part to show details of pedicle collar and teeth, Estoti, MNHN.F.A46518; F, G, inner view of dorsal valve and enlargement of cardinalia (G), Bélus,MNHN.F.A46521;H, I, inner and oblique lateral views of dorsal valve,visible high median septum without serrations,Estoti,MNHN.F.A46519; J-M, inner and oblique lateral views of dorsal valve, and enlargement of descending branches buttressed the septum (L) and cardinalia (M), Abesse, MNHN.F.A46516.All SEM.Scale bars:A, B, D, 1 mm; C, E, F, H-K, 500 µm; G, L, M, 200 µm.