FIGURE 22 in The diplacanthid fishes (Acanthodii, Diplacanthiformes, Diplacanthidae) from the Middle Devonian of Scotland

FIGURE 22. Diplacanthus tenuistriatus squamation and histology of scales from Tynet Burn and Gamrie. 1–8, NMS G.Canon Kyle no. 1 from Tynet Burn: 1, postpectoral–caudal peduncle region; 2, mid-body squamation; 3, scale crown; 4, vertical transverse section of scale from caudal region (area A); 5, vertical longitudinal section of scale from area A; 6, horizontal section through crown base, scale from posterior to ad.fs (area B); 7, mid-crown horizontal section, area B; 8, upper crown horizontal section, area B. 9–16, NMS G.1892.8.9 from Gamrie, Banffshire: 9, complete specimen; 10–16, sections of scales from upper flank area between ad.fs and pd.fs (area A) and lower flank in front of a.fs (area B); 10, calcified cartilage globules, posterior end of area B; 11, horizontal section through scale neck, posterior end of area B; 12, vertical longitudinal section, area A; 13, vertical transverse section, area A; 14, vertical longitudinal section, area A; 15, transverse section, area A; 16, vertical oblique section, area A. Scale bars equal 1 cm in 1, 9; 1 mm in 2-3; 0.1 mm in 4–8, 10–16. Abbreviations: a.fs=anal fin spine; pd.fs=posterior dorsal fin spine. Arrows indicate anterior direction, where relevant.