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DescriptionNucula sulcata has a solid, inequilateral shell. Large specimes can measure up to 1.9 cm in length. The heart shaped lunule is irregular. There are fine radiating ribs and concentric lines that make the surface of the shell finely decussate (criss-crossed). There are irregular transverse corrugations from the anterior hinge area to the umbo. The inside of the free margin is also crenulated.Nucula sulcata may be confused with Nucula nitidosa, however Nucula sulcata is typically larger with a anterior hinge line that is often corrugated.