 A 1997 study confirmed however that the two species were part of a clade of Afrotropical warblers within "Acrocephalus" that also includes the Madagascan swamp warbler, the greater swamp warbler, the lesser swamp warbler and the Cape Verde warbler.The Seychelles warbler is a small, plain "Acrocephalus" warbler, between in length and with a wingspan of .It has long grey-blue legs, a long horn coloured bill, and a reddish eye.