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FIGURE 1. Cranial remains of juvenile Dorudon atrox with bone modifications. 1.1, UM 94814 in dorsal view; 1.2, same, close-up of frontal shield with bone modifications; 1.3, UM 100139 in dorsal view; 1.4, same in ventral view; 1.5, UM 94811 in dorsal view; 1.6, UM 100142 in dorsal view. Scale bar equals 5 cm in 1.1 and 1.3-1.6. Scale bar equals 2 cm in 1.2.

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FIGURE 2. Comparative tooth marks of Basilosaurus isis. Imprints in modeling clay created using polyester casts of the upper teeth of specimen WH-74. Scale bar equals 5 cm.

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FIGURE 3. Placement of 3D digital surface model of juvenile Dorudon atrox specimen UM 94814 (blue) into the mouth of an adult Basilosaurus isis (reconstruction of WH-74, gray). 3.1, best fit of teeth to bone modifications in frontal view; 3.2, same in right lateral view; 3.3, same after readjustment in the mouth in right lateral view. Directions are given with respect to the skull of B. isis; bone modifications are highlighted in red.

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FIGURE 4. Placement of 3D digital surface model of juvenile Dorudon atrox specimen UM 100139 (blue) into the mouth of an adult Basilosaurus isis (reconstruction of WH-74, gray). 4.1, best fit of teeth to bone modifications in frontal view; 4.2, same in left lateral view; 4.3, possible decapitation position of UM 100139 in frontal view; 4.4, same in ventral view. Directions are given with respect to the skull of B. isis; bone modifications are highlighted in red.

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FIGURE 5. Placement of 3D digital surface model of juvenile Dorudon atrox specimen UM 94811 (blue) into the mouth of an adult Basilosaurus isis (reconstruction of WH-74, gray). 5.1, best fit of teeth to bone modifications in frontal view; 5.2, same in left lateral view. Directions are given with respect to the skull of B. isis; bone modifications are highlighted in red.

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FIGURE 6. Placement of 3D digital surface model of juvenile Dorudon atrox specimen UM 100142 (blue) into the mouth of an adult Basilosaurus isis (reconstruction of WH-74, gray). 6.1, best fit of teeth to bone modifications in frontal view; 6.2, same in left lateral view; 6.3, same in right lateral view. Directions are given with respect to the skull of B. isis; bone modifications are highlighted in red.

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FIGURE 7. Crania of adult Basilosaurus isis and adult Dorudon atrox drawn to scale, with measurements of distances between teeth (in mm). Skull length of B. isis is approximately 113 cm; skull length of D. atrox is approximately 95 cm. The drawing and measurements of B. isis are based on WH-74; D. atrox is redrawn and mirrored after Uhen (2004), with measurements of UM 101222.

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