Figs. 4a-f Entogonia briggeri n in Entogonia Briggeri N. Sp., A New Diatom Species From The Middle Miocene Of Romania And New Insights On The Fossil Marine Diatom Genus Entogonia Greville

Figs. 4a-f Entogonia briggeri n. sp., sample 1315; SEM external views (a-e) and SEM internal view (f). a Valve face exhibiting specific morphological features; b Girdle view showing elevations and one triangular spine on each elevation; c Valve face showing valve shape, round apices, elevations to poles (arrow) and exit pores (head arrow), areolae pattern on inner and outer triangles; d Detail showing the finely punctuated apices of elevation and exit pore close to elevation with a protruding hyaline lip; e Oblique valve view showing raised outer triangle, depressed central part of inner triangle, vertical mantle with one ring of enlarged pores (arrows); f Internal view showing the outer and inner triangles, internal costae, internal coil system. Scale bars: 20 µm.