The dorsal margin of the valve is strongly convex; the ventral margin is slightly concave. Ends are rounded, protracted, and occasionally slightly truncate and slightly recurved.
(Patrick and Reimer 1975).
Ecological & geographical distribution
Found in fresh or brackish water. The fresh water habitat of Lake Michigan has relatively low conductivity. (Patrick and Reimer 1975).
Length is 30 to 73 micrometers (Patrick and Reimer 1975).
Width is 9 to 18 micrometers (Patrick and Reimer 1975).
Costae are 2 to 4 in 10 micrometers (Patrick and Reimer 1975).
The image of this specimen was captured using DIC.