FIGURES 179–184 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 179–184. Scanning electron micrographs of Entogoniopsis foveata from Barbadoes. Fig. 179: External view of a specimen with fractured pseudocelli. Arrow points to the location of the central areola. Fig. 180: Internal view of a hypovalve with attached valvocopula and a displaced band of the epicingulum. Arrow indicates the location of the central areola. Fig. 181: Oblique external view of the specimen in Fig. 179. Note the fractures on the mantle revealing the internal costae (arrows). Fig. 182: Detail of the specimen in Fig. 180 showing the interior of the trifolium. Note well-preserved cribra visible on the underside of the depressed sector (arrowhead), and the absence of an internal slit in association with the central areola. Fig. 183: Detail of the specimen in Fig. 180, showing the girdle elements: attached valvocopula (VC) and the detached copula or pleura (C/P?). Arrow indicates one of the clasping devices that link the valvocopula to the internal costae. Fig. 184: Detail of the specimen in Fig. 180, showing the hyaline pars interior of the displaced girdle element (arrow), and the step on the mantle (arrowhead). Note well-preserved cribra visible on the mantle (black arrow).