\Phyl*lop"o*da\, n. pl. [NL., fr. Gr. ? a leaf +
-poda.] (Zo["o]l.)
An order of Entomostraca including a large number of species,
most of which live in fresh water. They have flattened or
leaflike legs, often very numerous, which they use in
swimming. Called also {Branchiopoda}.
Note: In some, the body is covered with a bivalve shell
      ({Holostraca}); in others, as Apus, by a shield-shaped
      carapace ({Monostraca}); in others, like Artemia, there
      is no carapace, and the body is regularly segmented.
      Sometimes the group is made to include also the
      Cladocera.