FIGURE 6 in The diplacanthid fishes (Acanthodii, Diplacanthiformes, Diplacanthidae) from the Middle Devonian of Scotland

FIGURE 6. Drawings of serial transverse sections of the spines of Diplacanthus crassisimus. 1, sketch of NMS G.2014.15.7, from Edderton, Ross and Cromarty, showing the position of sections in 2–6; the sections run from the distal end to the base of each spine. 2, anterior dorsal fin spine (ad.fs); 3, anal fin spine (a.fs); 4, right pelvic fin spine (pelv.fs); 5, left pelvic fin spine; 6, left pectoral fin spine (p.fs). 7, Sollas sections of a prepelvic spine (prepelv.s) on NMS G.2014.44.4. Scale bars equal 1 mm.