01 Amphibalanus improvisus

01 Amphibalanus improvisus

Opercular aperture acute at carinal end (1) and rounded at rostral end (2). Each white tergoscutal flap is dark at carinal end (3) and has four black-brown marks distributed along it (4). Scutum (5) has growth lines and a brown epidermis. Wall plates have a yellow epidermis except where eroded from the white edges.