The frustles in the girdle view are rectangular. The ventral margin is usually slightly concave at the center, straight at the ends of the valve; sometimes almost straight throughout the entire length. The dorsal margin is convex; narrowed, often reflexed at the ends to form truncate, somewhat capitate apices. The dorsal margin is sometimes not so formedand the ends are truncate-rostrate. The terminal nodules are distinct, at the ends of the valve, extending upwards along the apices. The striae are parallel.(Patrick and Reimer 1966).
This taxon is is usually found in in northern or mountainous localities in acid to circumneutral water(Patrick and Reimer 1966).