Galeodea triganceaeGaleodea triganceae is a species of large sea snail, a marine gastropod mollusc in the family Cassidae, the helmet snails.Shell descriptionThe maximum shell height is 48 mm, and maximum width 31 mm.DistributionThis species is endemic to New Zealand including the Chatham Islands.HabitatThis helmet shell is found at depths of between 90 and 600 m.