FIGURES 193–198 in Entogoniopsis gen. nov. and Trilamina gen. nov. (Bacillariophyta): a survey of multipolar pseudocellate diatoms with internal costae, including comments on the genus Sheshukovia Gleser

FIGURES 193–198. Scanning electron micrographs of Entogoniopsis tabellaria from Joe's River (Figs 193, 195) and Conset (Fig. 197), Barbadoes, and Maria Madre Island, Mexico (Figs 194, 196, 198). Fig. 193: Oblique external view of a specimen with convex summits of the polar elevations. Note the well-preserved domed vela. Arrowhead points to the inconspicuous hyaline marginal ridge. Arrow indicates the slight outward expansion of the hyaline mantle margin. Fig. 194: Oblique external view of a specimen with flat summits of the polar elevations, and displaced girdle elements preserved. Fig. 195: Detail of the specimen in Fig. 193, showing well-preserved rotae within the porelli of the pseudocellus, and domed cribra occluding the areolae. Fig. 196: Detail of the specimen in Fig. 194, showing a detail of the polar pseudocellus, distinctly cut off from the adjacent depressed sector, and the detached girdle elements, which likely represent copulae (C and C?). Fig. 197: Oblique internal view, showing the internal costae and the inwardly expanded mantle margin (arrowhead). Fig. 198: Internal view of a specimen with attached valvocopula (VC), and a preserved displaced copula (C). Arrowhead points to one of the clasping devices linking the valvocopula to the internal costae.