FIGURES 3–51. Sellaphora gologonica G.G in Sellaphora gologonica sp. nov. (Bacillariophyta, Sellaphoraceae), a new diatom species from a Mediterranean karst spring (Sardinia, Italy)

FIGURES 3–51. Sellaphora gologonica G.G. Lai, Ector & C.E. Wetzel sp. nov. Population "Su Gologone" spring. LM (Figs 3–46): size reduction series of the population. Specimen here depicted in Figs 6–7. Frustules rectangular in girdle view (Fig. 31). SEM (Figs 47–51): Figs 47–50. External views showing striae patterns (strongly radiate) and double areolae near the axial area on the valve surface. Arrows–sinuous raphe system. Fig. 51. Internal view showing slightly deflected raphe endings. Arrows–large rounded apical pits present at both apices. LM scale bar = 10 μm.