Amalda sibuetae n. sp., from off Mauritania in 1733–1855 m, represents the second deepest record for the family Olividae so far. The radular morphology of the new species differs markedly from that in other species currently classified in Amalda. No Neogene or Recent Atlantic species appears to be close enough to A. sibuetae to be considered its immediate ancestor. The world records of Olividae from depths greater than 400 m are listed.