Acorn barnacle
- kingdom: Animalia
- phylum: Arthropoda
- class: Maxillopoda
- order: Sessilia
- family: Chthamalidae
- genus: Chthamalus
- species: Chthamalus fragilis
Kingston
Kingston
Jamaica
New Haven
Connecticut- Oriole Beach
- Springfield
Florida- Bourne
Massachusetts- Beaufort
North Carolina- Port Isabel
Texas
United States