FIGURE 36. Rhadinacanthus longispinus NMS G.2014.4.32 in The diplacanthid fishes (Acanthodii, Diplacanthiformes, Diplacanthidae) from the Middle Devonian of Scotland

FIGURE 36. Rhadinacanthus longispinus NMS G.2014.4.32 from Achanarras Quarry, Caithness, scale histology. 1, articulated squamation from midflank area; 2–6, thin sections of midflank scales: 2, oblique vertical section; 3, magnified view of central crown of the same scale; 4, horizontal section of crown; 5, oblique vertical section; 6, oblique vertical section. Scale bars equal 0.1 mm. Abbreviations: ac=ascending canal; cW=canal of Williamson; gz=growth zones; hc=horizontal canal; w=neck swelling. Arrows indicate anterior direction, where relevant.