Pustulosa pustulosa shell description:

“Shell subquadrate, subrhomboid, subtriangular or suborbicular, generally inflated, solid, inequilateral; beaks full and high, turned forward over a deep lunule, their sculpture a few coarse corrugations; anterior end rounded; base straight or lightly curved; posterior end squarely or obliquely truncated, usually well-angled behind the ligament; posterior ridge only moderately developed, rounded; there is often a slight radial depression above it; surface, excepting at the anterior part, usually more or less covered with warty or lachrymose tubercles, sometimes nearly or quite smooth; epidermis tawny or tawny-greenish in young shells, often with a wide, broken, bright green ray, dirty brownish in old shells; pseudocardinals strong, triangular, more or less ragged, two in the left valve and three in the right; lateral of the right valve sometimes partly double; beak cavities deep, compressed; muscle scars impressed; nacre white thinner and iridescent behind ”(Simpson, 2014; Mather, 2007).