Lucinida

Lucinida (formerly Lucinoida) is a taxonomic order of saltwater clams, marine bivalve molluscs.

Families
In 2010, a new proposed classification system for the Bivalvia was published in by Bieler, Carter & Coan, revising the classification of the Bivalvia. Lucinoida (now Lucinida) thus became an order of its own. It includes the following two superfamilies:
 * Superfamily: Lucinoidea
 * Family: Lucinidae
 * Family: †Mactromyidae
 * Family: †Paracyclidae
 * Superfamily: Thyasiroidea
 * Family: Thyasiridae