FIGURES 149–154 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 149–154. Scanning electron micrographs of Entogoniopsis stokesiana from Pôtor (formerly Szent-Péter), Slovakia (Figs 149, 153–154) and Szurdokpüspöki ('Castel'), Hungary (150–152). Fig. 149: Oblique external view, showing a trifolium in the centre of the valve face. The central ring of rimoportulae is indicated with an arrowhead. Note the deep, stepped mantle (arrow). Fig. 150: Oblique internal view of a valve with four internal costae per side. Note that the more prominent costae are associated with the edges of the trifolium (arrows). The location of the rimoportulae is indicated with an arrowhead. Fig. 151: Detail of the central area, showing the external tubes of the rimoportulae bearing thickened rims, and granules scattered on the valve face (arrow). Note the well-preserved slightly sunken cribra, and the diminished size of areolae next to the rimoportulae. Fig. 152: Detail of the specimen in Fig. 150, showing the internal openings of the rimoportulae, in the form of a slit between slightly raised lips. Note the smaller areolae located next to the rimoportulae, and the well-preserved cribra. Fig. 153: Detail of a pseudocellus. Fig. 154: Oblique external view of a specimen with a detached girdle element, probably a copula (C?).