Abstract
Falcidens poias is a new aplacophoran species, the first to be described from Western Australia. It occurs amongst rhizomes of seagrass in Porpoise Bay, Rottnest Island, at densities of about 50 individuals m−2. Its closest known relative is F. lipuros Scheltema from Bass Strait. The species is interesting both because of its unusually shallow occurrence at 3 m and its abundance.