Gymnangium montagui (common name - yellow feathers) is a species of cnidarian in the family, Aglaopheniidae, first described in 1912 by Armand Eugène Billard as Halicornaria montagui, from a specimen found off Roskoff.
GBIF data show it as being found in the coastal seas of Ireland, the UK, France, Spain and Portugal.
References
External links Gymnanium montagui: Images & occurrence data from GBIF