Amphibalanus improvisus (Darwin, 1854)
Bay barnacle - Brakwaterpok
Terneuzen - Uitstroomdelta zeewaterkoeling, the Netherlands, 30-4-2025. Specimens A.
Terneuzen - Uitstroomdelta zeewaterkoeling, the Netherlands, 30-4-2025. Specimens A. Bottom left: Diadumene lineata (Green anemone - Groene golfbrekeranemoon).
Neeltje Jans - Vluchthaven, the Netherlands, 8-7-2010. On Carcinus maenas (Shore crab - Strandkrab).
With thanks to Marco Faasse for the identification or confirmation of the species (7-5-2025: "although 100% identification is not possible without removing the animal and examining it in detail").