The Collaborative International Dictionary of English v.0.48:

Phyllopoda \Phyl*lop"o*da\ (f[i^]l*l[o^]p"[-o]*d[.a]), prop. n.
   pl. [NL., fr. Gr. fy`llon a leaf + -poda.] (Zool.)
   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.
   [1913 Webster]

   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.
         [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Branchiopoda \Bran"chi*o*poda\, n. pl. [Gr. ? gill + -poda: cf.
   F. branchiopode.] (Zool.)
   An order of Entomostraca; -- so named from the feet of
   branchiopods having been supposed to perform the function of
   gills. It includes the fresh-water genera Branchipus,
   Apus, and Limnadia, and the genus Artemia found in salt
   lakes. It is also called Phyllopoda. See Phyllopoda,
   Cladocera. It is sometimes used in a broader sense.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Branchiopoda
    n 1: primitive aquatic mainly freshwater crustaceans: fairy
         shrimps; brine shrimps; tadpole shrimps; can shrimps; water
         fleas [syn: Branchiopoda, subclass Branchiopoda]