A tall anemone, up to 12 cm high, the slender column flaring outwards to the broad oral disc. The tentacles, up to about 100, are steeply graduated in size, the inner ones being very long in extension, stout at the base and tapering to fine points. They are perfectly retractile but rarely retracted. The column is brown often with irregular streaks of opaque white and the tentacles are brown becoming paler and whitish toward their tips. The overall brownish colouration may have a blue tint.Possibly conspecific with Aiptasia couchii (Cocks, 1850) although this may be a distinct species (R B Williams).
The column of this sea anemone is smooth, not divided into regions, tall in extension and trumpet-shaped. The tentacles are long, stout, tapering to fine points, not readily retracted. Acontia are present, fairly readily emitted from pores in column. Colour brown, column sometimes streaked with white or blue, disc with broad white or blue lines around tentacle bases. up to 120mm across tentacles. Column very variable in shape but typically trumpet-like, may attach to substrate by adhesive spots (not easily visible) on column. Has been confused with Anemonia viridis
, however Anemonia viridis
has a parapet, often bright green tentacles, and lacks acontia.
Local and uncommon in Britain, in extreme southwest only - Cornwall, Devon, Dorset, Bristol Channel, Kenmare River (southwest Ireland). Common in Channel Isles and northwest France, around southwest Europe and the Mediterranean.