Eunotia tauntonensis

Valves and narrow and arcuate with a convex dorsal margin and a concave ventral margin. Apices are distinctly expanded, terminating with apiculate ends. A single rimoportula is often present on the dorsal side of the apex. A helictoglossa is present on the ventral side of the valve face, next to the valve apex. The raphe curves onto the ventral margin toward the valve center. Striae are perpendicular to the valve margin (occurring 12-14 in 10 µm) at the valve center, becoming more dense (14-16 in 10 µm) near the apices. In some specimens, the striae bifurcate at the ventral margin. Areolae are fine, occurring about 40 in 10 µm.

As Patrick (1945) pointed out, Hustedt (1913) invalidly described E. tauntonensis ('tautoniensis') by providing only a name and a figure. In 1926, however, Hustedt validated E. tauntonensis by providing a diagnosis of the raphe as a distinguishing feature from other similar taxa. Therefore, Patrick (1945) is superfluous to Hustedt’s earlier nomenclatural validation.