FIGURE 6 in Morphology and histology of acanthodian fin spines from the late Silurian Ramsåsa E locality, Skåne, Sweden

FIGURE 6. Virtual thin sections of (1), morphotype E; (2), morphotype F; and, (3), morphotype G. Scale bars equal 450 µm (1 and 2) and 200 µm (3). Abbreviations: cc, central cavity; k, keel; med.c, median canal; r, ribbing; rib.c, ribbing canals; s, sulcus.