Thysanodonta eucosmia is a species of sea snail, a marine gastropod mollusc in the family Calliostomatidae.

[1] The height of the shell attains 4 mm.

It has a spiral shell of varying colors including bronze, light pink, white and red.

This marine species occurs off Norfolk Island at depths between 410 m and 775 m.

This Calliostomatidae-related article is a stub.