Lucinida (formerly Lucinoida) is a taxonomic order of saltwater clams, marine bivalve molluscs.
In 2010, a new proposed classification system for the Bivalvia was published in by Bieler, Carter & Coan, revising the classification of the Bivalvia.[1] Lucinoida (now Lucinida) thus became an order of its own. It includes the following two superfamilies: