Shell is elongate, triangular, inflated, and relatively thin. Anterior end rounded, posterior end sharply angled, ending in a blunt, squared point. Posterior ridge sharply angled and prominent, posterior slope broad, flat, and covered with fine ridges. Umbo is large, located near the center of the shell, and elevated above the hinge line. Beak sculpture of three or four heavy, double-looped ridges. Shell smooth and dull, yellowish green or bright green with numerous rays and dark green spots present. Posterior slope often lighter than rest of shell. Sharply angled posterior ridge, poorly developed teeth, and heavy beak sculpture. Pseudocardinal teeth thin and elongate; one in right, occasionally two in the left. Lateral teeth reduced to a thickened swelling along the hinge line. Inner shell beak cavity is moderately deep. Nacre bluish white, occasionally with salmon near the beaks.