FIGURE 3. High-resolution (voxel size: 0.678 µm) synchrotron data of fin spine morphotype A. (1), virtual thin section (slice 1535) showing the general morphology and internal organization of the vascular canals and osteocyte lacunae. (2,3), segmented data illustrating the organization of vascular canals and cell spaces, and, (4,5), the reconstructed data deconstructed to show each component. (6), virtual thin sections of magnified portion of ribbing, showing the ribbing canals from slices 820, 831, and 840. Red box in (1) shows the position of the magnified portion of the fossil. Abbreviations: bvc1,2, bone vascular canals (layers 1 or 2); dvc, dentine vascular canals; o, osteocyte spaces; r, rib; rib.c, ribbing canals; s, sulcus. Scale bars equal 250 µm.