FIGURE 15 in A redescription of the three longest-known species of the acanthodian Cheiracanthus from the Middle Devonian of Scotland

FIGURE 15. Cheiracanthus grandispinus head and branchial region, morphology. 1-2, NMS G.1966.40.24 from Lethen Bar. 3, NMS G. FR1603 from Achanarras Quarry, Caithness. 4, NMS G.2002.26.1481 from Achanarras Quarry. 5, NMS G.1903.130.19 from Achanarras Quarry, dorsoventrally flattened. 6, NHMUK PVP.1363 from Orkney. Scale bars equal 10 mm. addf, adductor muscle fossa; artc, articular cotylus; br, branchiostegal rays; cr.epq, extrapalatoquadrate ridge; gr, gular rays; Mc, Meckel's cartilage; pdbr, posterodorsal branchiostegal rays; pq, palatoquadrate; pqv, palatoquadrate vacuity; pregl, preglenoid process. Anterior to right in 1-3, 6, to left in 4-5.