an acorn barnacle
- kingdom: Animalia
- phylum: Arthropoda
- class: Maxillopoda
- order: Sessilia
- family: Balanidae
- genus: Balanus
- species: Balanus crenatus
Qaqortoq
Kujalleq
GreenlandLooe
Plymouth
Scarborough
England
United KingdomDutch Harbor
Unalaska
AlaskaNew Haven
Poquonock Bridge
ConnecticutEastport
MaineBeverly
Beverly Cove
Salem
Massachusetts
United States