Moelleria costulata, common name the ribbed moelleria, is a species of sea snail, a marine gastropod mollusk in the family Colloniidae.

[2] The size of the shell varies between 0.5 mm and 2.6 mm.

The shell is ribbed longitudinally.

This marine species occurs in circum-Arctic waters, off Alaska, in European waters, the Northwest Atlantic Ocean and down south to Morocco.

This Colloniidae-related article is a stub.