FIGURES 97–101 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 97–101. Scanning electron micrographs of Entogoniopsis major from Oamaru, New Zealand. Fig. 97: Oblique external view of a hypovalve with a displaced epicingulum element (C? = copula?). Note the thickenings on the depressed part of the valve face. Fig. 98: Detail of the specimen in Fig. 99, showing poorly preserved clasping devices of the valvocopula attached to the internal costae. Fig. 99: Oblique internal view of a specimen with remnants of the valvocopula attached (arrow). Fig. 100: Girdle view of a specimen with a valvocopula attached (VC). Fig. 101: Oblique internal view of the specimen in Fig. 100, revealing well-preserved clasping devices embracing the internal costae (arrow), and a fossa holding the inward expansion of the mantle margin (arrowhead).