Amalda northlandicaAmalda northlandica, common name the Northland olive, is a medium-sized sea snail, a gastropod mollusc in the family Ancillariidae, the olives.The status of this species is uncertain.DescriptionThe length of the shell attains 19 mm, its diameter 9 mm.DistributionThis marine species is endemic to New Zealand and occurs in shallow waters off North Island.