FIGURE 13. Leptochiton cancellatus (Sowerby, 1840). A–D. Poggio alla Fame (Italy), Pliocene, BD 364: A–B. Head valve, width 2.5 mm, dorsal (A) and lateral (B) views; C–D. Intermediate valve, width 3.4 mm, dorsal (C) and frontal (D) views. E–G. Vale de Freixo (Portugal), Lower to Upper Pliocene, GeoFCUL VFX.03.349, intermediate valve, width 3 mm, dorsal (E) and frontal (G) views, and close-up of surface ornamentation of central area (F) (valve figured by Dell'Angelo et al. 2022: figs 3.4–3.6). H. Salice (Italy), lower Pleistocene, BD 374, tail valve, width 2.7 mm, dorsal view. I–K. Rio di Bocca d'Asino (Italy), Miocene (Tortonian), MZB 32011, tail valve, width 2.4 mm, dorsal view (I) and close-up of surface ornamentation of antemucronal (J) and postmucronal (K) areas (valve figured by Dell'Angelo et al. 2015: pl. 3, figs 4–5). L. Rio S. Antonino (Liguria, Italy), Pliocene (Zanclean), MZB 45700, tail valve, width 1.7 mm, lateral view (valve figured by Dell'Angelo et al. 2013: pl. 1, fig. S). M–P, Q–T. Ukraine, middle Miocene (Badenian): M–N. Varovtsi, BD 351, head valve, width 3.5 mm, dorsal view (M) and close-up of surface ornamentation (N); O–P. Varovtsi, BD 351, intermediate valve, width 2.3 mm, dorsal view (O) and close-up of surface ornamentation of central area (P); Q–T. Horodok, BD 352, tail valve, width 3 mm, dorsal (Q), ventral (S) and lateral (T) views, and close-up of surface ornamentation of antemucronal area (R). Scale bars: 200 µm (J, K); 100 µm (F, N, P, R).