Shell is relatively thin, elliptical to oval (females) with rounded anterior margin; sharply rounded to angular posterior margin (males); more broadly rounded posteriorly with slight indentation on posterior margin (females). Umbo is low, slightly raised above hinge line. Epidermis is smooth, shiny yellowish-brown; green rays numerous posteriorly. Inside shell beak cavity is shallow; pseudocardinal teeth small, erect, roughened and often divergent; lateral teeth short, straight to slightly curved, blade-like; nacre (lining) iridescent white to bluish-white to salmon.
Similar species: Ellipse is more elongate and thicker with well-developed, stout teeth.