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Abstract
A new species of Melanella is described from New Zealand. The last turn of the body emits a lime yellow glow, the first record of luminescence in Eulimidae and the first record of yellow luminescence in a gastropod (otherwise blue). It is parasitic on the holothurian Ocnus brevidentis (Hutton, 1872). Melanella archeyi (Finlay, 1928) and M. aucklandica (Suter, 1909) are recognised as distinct species, and outer lip profiles of the holotypes are illustrated.