02 Balanus crenatus

02 Balanus crenatus

1: tergum seen edge-on. 2: scutum. 3: carina. 4&5: lateral plates. 6: rostrum. 7: radius. 8: ala.
Ridged plates. Acute carinal end, rostral end blunt, so pentagonal aperture. Large, 15 mm diameter, uneroded, uncrowded specimen without marine growths from near surface of non-tidal marine lake, salinity 31.9 ‰ in Dee Estuary, Wirral, England. June 2011.