Serrata summa is a species of sea snail, a marine gastropod mollusc in the family Marginellidae, the margin snails.

[2] The name comes from the Latin summus, similar to the English summit, referring to where the species was found, which was on the crest of a seamount.

[3] The length of the shell attains 4.4 mm.

The shell is slender, solid, and opaque.

[3] This marine species occurs off New Caledonia (depth range 266–267 m.)[3] It has been found in the locality of Norfolk Ridge.