FIG. 5. — A-O, Loganellia matura n in Ordovician and Lower Silurian thelodonts from Severnaya Zemlya Archipelago (Russia)

FIG. 5. — A-O, Loganellia matura n. sp.; A, B, head scales; C-E, transitional scales; F-M, O, trunk scales; N, fin? scale; A, C, F-H, J-L, N, scales in crown view; B, D, E, M, scales in lateral view; I, a scale in base view; N, posterior half of a trunk? scale in lateral view; A, Pi 7486; B, Pi 7487; C, Pi 7499; D, Pi 7496; E, Pi 7489; F, Pi 7494; G, holotype Pi 7492; H, Pi 7490; I, Pi 7497; J, Pi 7493; K, Pi 7501; L, M, Pi 7495; N, Pi 7485; O, Pi 7500; sample MF 3-8, Srednii Island, Sedov Archipelago, Golomyannyj Formation, middle Llandovery, Lower Silurian; P-S, Thelodus calvus n. sp.; P, LIG 35-907; Q, holotype Pi 7503; R, Pi 7505; S, Pi 7504; P, a scale in crown view; Q, S, in lateral view; R, in base view; P, sample 32a-208; Q-S, sample MF 46-23; Ushakov River, October Revolution Island, Samojlovich Formation, Wenlock, Lower Silurian. Scale bars: 0.1 mm.