Caulacanthus ustulatus
- kingdom: Plantae
- phylum: Rhodophyta
- class: Florideophyceae
- order: Gigartinales
- family: Caulacanthaceae
- genus: Caulacanthus
- species: Caulacanthus ustulatus
Knokke-Heist
Flanders
Belgium
Sooke
British Columbia
Canada
Funchal
Madeira
Areosa
Viana do Castelo
Viana do Castelo
Portugal
Broadstairs
Combe Martin
Dover
Eastbourne
Ramsgate
England
United Kingdom
Honolulu
Hawaii
United States
Arrecife