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FIGURE 1. Reconstructions of Bothriolepis canadensis: 1.1, redrawn from Patten (1904, figure 1); 1.2, redrawn from Stensiö (1948, text-figure 38); 1.3, redrawn from Vézina (1996, figure 1); 1.4, redrawn from Arsenault et al. (2004, figure 8C-8D); 1.5, new reconstruction based on 3D model. Alignment and scaling based on the dorsal thoracic armor length.

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FIGURE 2. 3D reconstruction of Bothriolepis canadensis. Odd numbers without pectoral fins showing the brachial process, even numbers with pectoral fins; 1-2, dorsal view; 3-4 lateral view; 5-6, ventral view; 7-8, front view; 9-10, posterior view; 11, lateral view with posterior part of the body. Scale bar equals 1 cm. Use this figure as a target for the PaleoAR mobile application to get the 3D model.

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FIGURE 3. New reconstruction of Bothriolepis canadensis. Odd numbers without pectoral fins showing the brachial process, even numbers with pectoral fins; 1-2, dorsal view; 3-4 lateral view; 5-6, ventral view; 7-8, front view; 9-10, posterior view. Scale bar equals 1 cm.

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FIGURE 4. Gill opening of Bothriolepis canadensis. Head plates and pectoral fin in transparency to illustrate the relationships between the anterior ventrolateral plate (AVL) and the submarginal plate (SM).

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FIGURE 5. 3D reconstruction of the right pectoral fin of Bothriolepis canadensis: 1, lateral view; 2, medial view; 3, ventral view; 4, dorsal view. Scale bar equals 1 cm.

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FIGURE 6. 3D reconstruction of the right pectoral fin segments of Bothriolepis canadensis: 1, lateral view of proximal segment; 2, medial view of proximal segment; 3, ventral view of proximal segment; 4, lateral view of distal segment; 5, medial view of distal segment. Scale bar equals 1 cm.

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FIGURE 7. Range of movements for the pectoral fin of Bothriolepis canadensis: 1, rotation around the brachial process in fully retracted position; 2, fully protracted position; 3, fully protracted position front view; 4, latero-medially movement of the distal segment; 5, minimum angle of protraction for maximum mobility of the pectoral fin; 6, rotation around the brachial process in a protracted angle of 16°; 7, up-and-down movement in a protracted angle of 16°. Use this figure as a target for the PaleoAR mobile application to get a video of pectoral fins possible movement range.

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FIGURE 8. Taphonomic differences with reference to two types of sediment compaction for Bothriolepis canadensis: 1 and 1’, specimen MHNM 02-387 in dorsal view preserved in laminites with coronal sectioned with positioning of the sections illustrated in 2-5; 2-5, coronal sections showing the flattening and distortion of the specimen; 6 and 6’, specimen MHNM 02-2676 in dorsal view preserved in siltstone with positioning of the CT-scan coronal sections 7-10; 7-10, coronal sections showing the 3D condition of preservation and a weak lateral compaction.

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