Fig. 4 in Dermal armor histology of Saltasaurus loricatus, an Upper Cretaceous sauropod dinosaur from Northwest Argentina

Fig. 4. Microanatomy and histology of Saltasaurus loricatus Bonaparte and Powell, 1980 dermal ossicles from El Brete locality (Late Cretaceous,?late Campanian–Maastrichtian, Salta Province, Argentina). A. Transverse section showing the position and arrangement of vascular canals (PVPLh 001−III) in normal (A1) and polarized (A2) light. Note the vertical and horizontal system of structural fiber bundles. B. Detail of the three orthogonal systems of structural fibers. Horizontal systems of fiber bundles are visible in longitudinal and cross section. C. Dermal ossicle in longitudinal section (PVLPh 002−II). Polarized light. D. Detail of the fibrous matrix showing the small cell lacunae. E. Lines of arrested growth in the lateral region in transversal section (PVLPh 009). Structural fibers give a striate appearance to the sample. Polarized light. Abbreviations: cl, bone cell lacuna; hf, horizontal fiber bundle; LAG, line of arrested growth; lhf, longitudinally sectioned horizontal fiber bundle; thf, transversely sectioned horizontal fiber bundle; vc, vascular canal; vf, vertical fiber bundle.