Sinum planulatum

{{Short description|Species of gastropod}}

{{Speciesbox

| image = Sinum planulatum.png

| image_caption = Illustration of juvenile (7–9) and adult (10–12) S. planulatum from Weinkauff.

| taxon = Sinum planulatum

| authority = (Récluz, 1843)

| synonyms =

• Ectosinum pauloconvexum Iredale, 1931
• Ectosinum planulatum (Récluz, 1843)
• Sigaretus gualtierianus Récluz, 1851
• Sigaretus planulatus Récluz, 1843 (original combination)
• Sinum (Ectosinum) planulatum (Récluz, 1843) accepted - alternate representation
• Sinum planatum (misspelling)

| synonyms_ref = Bouchet P. (2015) Sinum planulatum (Récluz, 1843): in Mollusca base (2015) Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia php?p=taxdetails&id=569948 on 2016-03-26

}}

Sinum planulatum , the flattened ear snail, is a species of sea snail, a marine gastropod mollusk in the family Naticidae, also known as the moon snails.{{Cite web |title=WoRMS - Sinum planulatum (Récluz, 1843) |url=https://www.marinespecies.org/aphia.php?p=taxdetails&id=569948 |access-date= |website=World Register of Marine Species}}