Digenea
noun plural
                                                                                                                            
                                                            Di·ge·nea
                    
                                                                                                              
                                                                                                                                  dī-ˈjē-nē-ə  
                                                      
                                                          
            
                                
              
          
                                                      : a subclass, suborder, or other taxon of trematode worms which have a complex life cycle involving alternation of sexual reproduction as an internal parasite of a vertebrate with asexual reproduction in a mollusk and often including developmental stages in still other hosts and which include a number of parasites (as the Chinese liver fluke) of humans   compare monogenea                                      
                
                    
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  Merriam-Webster unabridged




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