Thylacodes decussatus is a species of sea snail, a marine gastropod mollusk in the family Vermetidae, the worm snails or worm shells.

This species was previously known as Serpulorbis decussatus.

[1] The maximum recorded shell length is 90 mm.

[2] The minimum recorded depth for this species is 0 m; maximum recorded depth is 80 m.[2]

This Vermetidae-related article is a stub.