CHROMOPHYTA : Scytosiphonales : ScytosiphonaceaeBROWN ALGAE

Petalonia filiformis (Batters) Kuntze


Description: Thallus slightly flattened, without branches and frequently spirally twisted, ribboin-like. Attached by rhizoidal filaments growing to 8 cms long and no more than 0.5 mm broad.

Habitat: Infrequent. Epilithic in the upper littoral.

Distribution: Apparently on eastern shores of the British Isles. Europe: southern North Sea, Germany and Iceland.

Key Identification Features:

  • Unbranched, flattened and spirally twisted.

Distribution Map from NBN: Petalonia filiformis at National Biodiversity Network mapping facility, data for UK.

iNaturalist: Petalonia filiformis at iNaturalist World Species Observations database.

WoRMS: Petalonia filiformis at World Register of Marine Species.

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 Morton, O., Keatley, L., Morrow, C.C. & Picton, B.E. (2026). Petalonia filiformis. (Batters) Kuntze. [In] Encyclopedia of Marine Life of Britain and Ireland.
https://habitas.org/mbdp/species.php?item=ZR6120. Accessed on 2026-11-01