Munditia anomala is a minute sea snail, a marine gastropod mollusc in the family Liotiidae.
The shell of this species reaches a height of about 0.45 mm and a diameter of about 1 mm, making it one of the smaller marine gastropods. The shell exhibits a turbiniform or discoidal shape, characteristic of the Liotiidae family. The aperture is circular and feebly nacreous, with a thickened outer lip that is continuous and attached to the body whorl for a short length. The operculum is multispiral, horny, and hispid, with a soft, calcareous outer layer formed of pearly beads disposed spirally.
It occurs at Tom Bowling Bay, North Island, New Zealand.