FIGURES 120–124 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 120–124. Scanning electron micrographs of Entogoniopsis squamatoportulata from Vema Cruise 17, Core 107, South Atlantic Ocean. Fig. 120: Internal valve view, showing the location of the central ring of 17 rimoportulae (arrow). Fig. 121: Detail of the specimen in Fig. 120, showing the internal openings of the rimoportulae in the form of short slits across slightly raised papillae. Fig. 122: Oblique internal view, showing the depressed centre of the valve face, and the complex pattern of internal costae in the marginal part of the valve face and on the mantle. Fig. 123: Detail of the prominent pseudocellus. Note the well-preserved volae within the areolae. Fig. 124: Detail of the pattern formed by the internal costae. Note the inwardly expanded, smooth hyaline margin of the mantle (arrow).