An order of Entomostraca including a large number of species, almost all of which inhabit fresh-water. They usually have flattened or leaflike feet, usually really numerous, that they use within swimming. Known as in addition Branchiopoda.
An order of entomostracous crustaceans, the leaf-footed crustaceans, occasionally developing (with Ostracopoda and Cladocera) a suborder of Branchiopoda.
In conchology, in J. E. Gray's category (1821), one of several sales of Conchophora, containing dimyarian bivalve mollusks having the foot lamellar or elongate.