Thysanodonta eucosmiaThysanodonta eucosmia is a species of sea snail, a marine gastropod mollusc in the family Calliostomatidae.DescriptionThe height of the shell attains 4 mm. It has a spiral shell of varying colors including bronze, light pink, white and red.DistributionThis marine species occurs off Norfolk Island at depths between 410 m and 775 m.