FIGURES 1–7. Monoportula uralensis. Figures 1 in Notes on the rare Cretaceous species Syndetocystis uralensis Strelnikova leading to the description of a new monotypic genus Monoportula P.A.Sims et D.M.Williams nov. gen.

FIGURES 1–7. Monoportula uralensis. Figures 1, reproduction of holotype image of Syndetocystis uralensis from Strelnikova (1974, p. 79, tab. XXVII, fig. 4), "Eastern slopes of Pre-Polar Urals, Severnaya Sos'va River, Ust'-Man'ya Core 82, 145–149.5cm […] diatomite; Campanian, plate XXVII, fig. 4" (Strelnikova 1974, p. 79), Upper Cretaceous (Campanian), rimoportula arowed; Figures 2, 3, LM specimen of Monoportula uralensis from BM 82242, Kuril Islands, Russia, "U.S.S.R. #1" (selected specimen, single mount, rimoportula arrowed); Figures 4–7, SEM, Figure 4, external view of whole valve, rimoportula arrowed, Figures 5, 6, external girdle view of frustule with mantle areolae covered as network of anastomosing costae, Figure 7, detail of Figure 5 showing the long extended tube of the rimoportula, bending towards mantle. Scale bars = 20μm (Figs 4, 5, 6), = 5μm (Fig. 7); Figs 4, 5, 7 from "R122", Russia (BM Stub P1190), Figure 6 from "R116" (BM Stub P1100) both ex Strelnikova, possibly specimens from type material.