FIGURE 4 in The diplacanthid fishes (Acanthodii, Diplacanthiformes, Diplacanthidae) from the Middle Devonian of Scotland

FIGURE 4. Diplacanthus crassisimus, articulated specimens: 1–3, NMS G.2014.44.3 from Edderton, Ross and Cromarty: 1, complete specimen; 2, right occlusal plate; 3, left circumorbital and postorbital plates; 4,NMS G.2014.15.21, a ventrodorsally flattened specimen from Cruaday Quarry, Orkney, showing prepelvic spines; 5–7, NMS G.1891.99.10 from Tynet Burn, Moray: 5, head region; 6, impression of a displaced cheek, rotated 90° counterclockwise; 7, postorbital plate; 8–10, NHM OR.36582 from Tynet Burn, Moray: 8, complete specimen with head region ventrodorsally flattened, with articulated, displaced branchial region; 9, branchial region; 10, sketch of branchial region elements, rotated 90° clockwise. Scale bars equal: 1 cm for 1, 5, 8 and 5 mm for 2–4, 6, 7, 9. Abbreviations: ad.fs=anterior dorsal fin spine; bb=basibranchial; cb=ceratobranchials; ck.p=cheek plate; co.p=circumorbital plate; eb=epibranchials; oc=occlusal plate; pb=pharyngobranchials; prepelv.s=prepelvic spine; proc=procoracoid; scap=scapulocoracoid.