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Project Noah Nature School
Semibalanus balanoides
Deeply grooved barnacles. Feeding behavior in photos 4-6
Boulders on the edge of the seashore
You can tell that these are Semibalanus because when you look inside the dead ones, you can see rock, which means that the base is membranous, not calcareous. The big ones look like they are 2 years or older. Love the pictures that you added of the cirri!
Spotted on Apr 21, 2016
Submitted on May 17, 2016
