This taxon has a long, elliptical valve and has flat, rounded, subcapitate ends. There is a straight axial area and a straight Raphe. The proximal ends of the Raphe valve are slightly enlarged and are rounded. The distal ends are bifurcate. This taxon has a dilated central area and there is a submarginal longitudinal band on both sides of the valve. The striae are radiate to convergent at the ends (Patrick and Reimer 1966). This species is found in Lake Superior (E.F. Stoermer collection).
Type Locality
New England States (Patrick and Reimer 1966).
Ecology
This taxon prefers a pH of about 7.5 to 7.9 and also open water (Beaver 1981).
Length is 60 to 75 micrometers (Patrick and Reimer 1966).
Width is 18 to 20 micrometers (Patrick and Reimer 1966).
Striae are 16 to 17 in 10 micrometers (Patrick and Reimer 1966).
Puncta are 16 to 18 in 10 micrometers (Patrick and Reimer 1966).
This image was taken utilizing DIC for the specimen above.