Idas argenteus var. lamellosus Verrill, 1882 is recorded for the first time from the northeast Atlantic. It is regarded as distinct from I. argenteus and given species rank as Idas lamellosus. The shell is described from material collected by the Triton expedition of 1882 from the Wyville-Thomson Ridge at a depth of 944 metres. The shells were extracted from sunken wood along with specimens of I. argenteus.