Eunotia magnaparva sp. nov., SEM from type material, sample CCA 4521. A. External valve view of larger cell, note the cordiform apices with discontinuous striae. B–C. External valve view of cells medium size, note the reduced raphe in C and the slightly more pronounced raphe in D. Similarly, valve B has marginal spines while in valve C spines are almost absent. D. Cell representing the smallest extremity of the cell cycle, note pronounced raphe endings extending onto the valve face and interrupted striae. Scale bars = 2 µm.