FIG. 37 in Devonian acanthodians from Severnaya Zemlya Archipelago (Russia)

FIG. 37. — Poracanthodes punctatus Brotzen, 1934, scale histology; A, vertical longitudinal section through the old? scale with randomly displaced pores, thin section 3365; B, magnified right area of the same section; C, vertical longitudinal section through the scale with concentrically displaced pores, thin section 3462; D, vertical transverse section through the posterior part of scale with concentrically displaced pores, thin section 3464; E, vertical longitudinal section of scale, thin section 973; F, magnified central area of the same section. Paratype LIG 35-A-391; Pioneer Island, sample 12-76. Upper Silurian, Pridoli, Member 3 (A, B) and Spokojnaya River, outcrop 41, bed 12; Severnaya Zemlya Formation (C-F). Abbreviations: arcpc, arcade pore canal; avc, ascending vascular canal; oc, osteocyte cavity; po, pore opening; prgl, primordial growth lamella; rpc, radial pore canal. Scale bars: 0.1 mm.