Eunotia globicephala sp. nov., SEM from type material, sample 13-335. A. External view of valve of smaller cell, no marginal spines present. B. External view of valve of large cell, flexed 90° around the apical axis. C. External view of dorsal margin and apices, note the marginal spines and open copulae. D. External view of the ventral mantle showing the position of the raphe (arrowhead). E. External view of mid-valve showing the conical marginal spines and areolae occluded externally. F. Internal view of the valve apex showing helictoglossa and rimoportula (arrowhead) located very close to the ventral margin. Scale bars = 2 µm.