an acorn barnacle
- kingdom: Animalia
- phylum: Arthropoda
- class: Maxillopoda
- order: Sessilia
- family: Balanidae
- genus: Balanus
- species: Balanus crenatus
- Qaqortoq
Kujalleq
Greenland- Looe
- Plymouth
- Scarborough
England
United Kingdom- Dutch Harbor
- Unalaska
Alaska- New Haven
- Poquonock Bridge
Connecticut- Eastport
Maine- Beverly
- Beverly Cove
- Salem
Massachusetts
United States