FIG. 23. — A-F, Nostolepis watsoni n in Devonian acanthodians from Severnaya Zemlya Archipelago (Russia)

FIG. 23. — A-F, Nostolepis watsoni n. sp., scales, Pioneer Island, sample P-10-1, Lower Devonian, Member 8. (Here and further members of the Pioneer Island geological sequence taken after Klubov et al. 1980); A, holotype, LIG 35-2020, crown; B, LIG 35-1968, crown; C, LIG 35-1938, base; D, LIG 35-1937, crown; E, LIG 35-1969, side; F, LIG 35-1940, crown; A, B, D, F, anterior upwards; C, to left; E, to right; G-K, Watsonacanthus costatus n. sp., scales; G, LIG 35-1967, crown; H, LIG 35-2140, crown; I, LIG 35-1422, side; J, LIG 35-1993, crown; K, holotype, LIG 35-2074, crown; anterior upwards (G, K, J), to the left (H) and to right (I); G-I, Pioneer Island, sample P-10-1, Lower Devonian, Member 8; J, K, October Revolution Island, Spokojnaya River, outcrop 48, bed 5, lower Al'banov Subformation; L, M, Acanthodii indet., scales, crowns, anterior upwards; L, LIG 35-1997; M, LIG 35-1998, Komsomolets Island, outcrop 18077, bed 9, Spokojnaya Formation; N-P, Gomphonchus nordicus n. sp., scales; N, LIG 35-2006, crown, anterior upwards; O, LIG 35-2008, side, anterior to left; P, holotype, LIG 35-2007, crown, anterior upwards, Pioneer Island, sample 12-76, Upper Silurian, Pridoli, Member 3. Scale bar: 1 mm.