Nuculida

{{Short description|Order of bivalves}}

{{distinguish|Nuculanida}}

{{Automatic taxobox

| image = Nucula nucleus 2008-09-09-63.jpg

| image_caption = Nucula nucleus

| taxon = Nuculida

| authority = Dall, 1889

| subdivision_ranks = Superfamilies

| subdivision = * Nuculoidea

| synonyms = Nuculoida

}}

Nuculida is an order of small saltwater clams, marine bivalve mollusks, within the subclass Protobranchia. "Nuculida" is sometimes spelled "Nuculoida". This order contains two families, the extant Nuculidae and the extinct Praenuculidae.{{Cite web |title=Molluscabase - Nuculoidea Gray, 1824 |url=https://www.molluscabase.org/aphia.php?p=taxdetails&id=14656 |access-date=2023-08-04 |website=www.molluscabase.org}} Clams in the family Nuculidae are commonly known as nut clams.