FIGURES 171–176 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 171–176. Scanning electron micrographs of Entogoniopsis kempii from dredging DODO-123-D1, Mascarene Ridge, Indian Ocean. Fig. 171: Oblique external view, showing the pattern of valve face undulations. Note the flat summits of the polar elevations, distinctly cut off from the remainder of the valve face by the rugged hyaline marginal ridge (arrow). Location of the rimoportulae is indicated by arrowhead. Fig. 172: Oblique internal view, showing a series of prominent internal costae along each margin. Rimoportulae are indicated by arrowhead. Fig. 173: External view of the valve face, showing five inconspicuous rimoportulae located in the central part of the trifolium (arrows). Fig. 174: Internal view of the central area, showing nine rimoportulae with slightly raised internal openings (arrow). Fig. 175: Detail of a polar elevation, showing a flat summit, and a fractured pseudocellus located on the distal face of the elevation. Fig. 176: Detail of the mantle, showing an inwardly expanded margin (arrow), and robust internal costae.