08 Semibalanus balanoides

08 Semibalanus balanoides

Disarticulated opercular valves (bleached). Faces of right tergum (1, 2 &4) and scutum (3 &5).
Faces 2 and 3 are visible on the live animal when the operculum is closed. A protuberance (6) on the scutum rests in a cavity (7) in the tergum in life. See image 9 for variation.