Thylacodes decussatus

{{Short description|Species of gastropod}}

{{Speciesbox

| image =

| image_caption =

| genus = Thylacodes

| species = decussatus

| authority = (Gmelin, 1791)

| synonyms_ref =

| synonyms = *Serpula decussata Gmelin, 1791

}}

Thylacodes decussatus is a species of sea snail, a marine gastropod mollusk in the family Vermetidae, commonly known as worm snails or worm shells. This species was formerly known as Serpulorbis decussatus.{{WRMS species|419555|Serpulorbis decussatus (Gmelin, 1791)|||WoRMS (2010). Serpulorbis decussatus (Gmelin, 1791). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=419555 on 9 July 2010}}