digenea

from The Collaborative International Dictionary of English v.0.48

Digenea \Di*ge"ne*a\, n. pl. [NL., fr. Gr. di- = di`s- twice + ?
   race, offspring.] (Zool.)
   A division of Trematoda in which alternate generations occur,
   the immediate young not resembling their parents.
   [1913 Webster]