Source : Webster's Revised Unabridged Dictionary (1913)

Phyllopoda \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.

Holostraca \Ho*los"tra*ca\, n. pl. [NL., fr. Gr. "o`los whole +
   ? shell of a testacean.] (Zo["o]l.)
   A division of phyllopod Crustacea, including those that are
   entirely covered by a bivalve shell.