Monoplex lignarius

{{Short description|Species of gastropod}}

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{{speciesbox

| image = Monoplex lignarius.jpg

| image_caption = Apertural view of Monoplex lignarius (Broderip, 1833)

| taxon = Monoplex lignarius

| authority = (Broderip, 1833)

| synonyms_ref =

| synonyms = Triton lignarius Broderip, 1833

}}

Monoplex lignarius is a species of predatory sea snail, a marine gastropod mollusk in the family Cymatiidae.{{WRMS species|476526|Monoplex lignarius (Broderip, 1833)||6 December 2018}}