- Kingdom: Animalia
- Phylum: Mollusca
- Class: Gastropoda
- Subclass: Patellogastropoda
- Superfamily: Patelloidea
- Family: Patellidae
- Scientific name: Patella vulgata
- Norwegian: albuskjell
The shell has distinct ridges radiating from the top. On locations exposed to strong waves the ridges may be almost invisible. They are grinded away by stones in constant movement. The color of the shell exterior is usually grey, perhaps with a tint of yellow. The inside is usually greenish grey. The shell diameter may reach 6 cm.
It thrives on exposed, rocky locations from the high tidal zone and shallow subtidal zone.
It is abundant in the North-East Atlantic Ocean, from Nordland, Norway to the Mediterranean.