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FIGURE 1. Map showing the environs of Caen and Bayeux (northwest France) and the type locality, Les Fours à Chaux (asterisk), of Bajoprosopon piardi n. gen. and sp. The simplified log (right) illustrates the lithology, lithostratigraphical nomenclature and chronostratigraphy (after Pavia et al., 2015).

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FIGURE 2. Macrofaunal elements associated with Bajoprosopon piardi n. gen. and sp.; upper Bajocian ‘Oolithe ferrugineuse de Bayeux’ Formation, upper garantiana ammonite Zone, dichotoma ammonite Subzone, ‘Les Fours à Chaux’, between Croisilles and Les Moutiers-en-Cinglais (Calvados, northwest France). A. Neocrassina obliqua (Lamarck, 1819) and Astarte elegans J. Sowerby, 1816; B. Ctenostreon rugosum (Smith, 1817); C. Dickesicidaris copeoides (Agassiz in Agassiz and Desor, 1847); D. Spiroceras annulatum (Deshayes, 1831); E. Garantiana (Pseudogarantiana) dichotoma (Bentz, 1928); F. Pyrgotrochus elongatus (J. Sowerby, 1818); G. Leptomaria amoena (Deslongchamps, 1848); H. Eopecten velatus (Goldfuss, 1833); I. Sphenorhynchia plicatella (Sowerby, 1825). Collection and photographs: Lionel Maerten. Scale bars equal 10 mm.

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FIGURE 3. Composition of the family Prosopidae, as considered herein. A. Europrosopon (E. verrucosum), reconstructed after Klompmaker et al. (2020: figure. 11E). B. Rathbunopon (R. obesum), reconstructed after Klompmaker et al. (2011: figure 3C). C. Bajoprosopon n. gen. (B. piardi n. gen. and sp.). D. Protuberosa (P. protuberosa), reconstructed after Wehner (1988: Pl. 1, figure 3). E. Nipponopon (N. hasegawai), reconstructed after Karasawa et al. (2006: figure 1A). F. Acareprosopon (A. bouvieri). G. Prosopon (P. tuberosum, left drawing after von Meyer, 1840; P. mammillatum, right photograph). Scale bars equal 2 mm (A-F) or 5 mm (G).

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FIGURE 4. Holotype of Bajoprosopon piardi n. gen. and sp. (MAB k.3764) from the upper Bajocian ‘Oolithe ferrugineuse de Bayeux’ Formation (upper garantiana ammonite Zone, dichotoma ammonite Subzone) at the ‘Les Fours à Chaux’ outcrop between Croisilles and Les Moutiers-en-Cinglais (Calvados, France; Figure 1). A, dorsal view of carapace. B, frontal view of carapace. C, left lateral view of carapace. Scale bar equals 5 mm.

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