Petalonia filiformis
- kingdom: Chromista
- phylum: Ochrophyta
- class: Phaeophyceae
- order: Scytosiphonales
- family: Scytosiphonaceae
- genus: Petalonia
- species: Petalonia filiformis
Berwick-Upon-Tweed- Clacton-on-Sea
England- Saint Andrews
Scotland
United Kingdom