Trigonostoma thysthlon

{{Short description|Species of gastropod}}

{{Use dmy dates|date=December 2023}}

{{Speciesbox

| image = Trigonostoma thysthlon.JPG

| image_caption = Apertural view of shell of Trigonostoma thysthlon

| genus = Trigonostoma

| species = thysthlon

| authority = Petit & Harasewych, 1987

| synonyms_ref =

| synonyms =

}}

Trigonostoma thysthlon is a species of sea snail, a marine gastropod mollusc in the family Cancellariidae, the nutmeg snails.{{WRMS species|464845|Trigonostoma thysthlon Petit & Harasewych, 1987||8 September 2010}}