19 Perforatus perforatus COMPARISON image of Balanus balanus.

19 Perforatus perforatus COMPARISON image of Balanus balanus.

Balanus balanus has strongly vertically-furrowed wall plates with no pink staining. Its opercular aperture has a small, pear-shape with a sharp carinal end and rounded rostral end. Menai Strait, Wales. March 2015.