• Kingdom: Animalia
  • Phylum: Arthropoda
  • Subphylum: Crustacea
  • Class: Maxillopoda
  • Subclass: Thecostraca
  • Infraclass: Cirripedia
  • Superorder: Thoracica
  • Order: Sessilia
  • Family: Balanidae
  • Scientific name: Balanus balanus
  • Norwegian: steinrur


The carapace of this sessile barnacle is conical. The cone base is circular with an an irregular edge and a diameter of 2-3, sometimes of 5 cm. Radial ridges dominate the carapace surface, which is white or light brown if not covered with growth. The cover plates protecting the lid, are shaped like a birds beak.


It is sometimes very abundant on rocks, stones, shells or any other hard surfaces from the subtidal zone to several hundred meters deep.


B. balanus is distributed over the entire northern hemisphere.