DIGENETIC TREMATODES 15 



Crepidostomum cooperi Hopkins, 1931 



Synonj-ms : Crepidostomum ambloplitis Hopkins, 1931 (Hopkins, 1934) 

 C. solidum Van Cleave & Mueller, 1932 (Hopkins, 1934) 

 C. fausti Hunninen & Hunter, 1933 (Hopkins, 1934) 



Hosts : Salvelinus fontinalis 



S. malma 



Sahno gairdncri 

 Crayfish and mayflies 



Additional hosts have been reported from Ontario, New York, Maine, Il- 

 linois, Louisiana, Mississippi, Oklahoma (Hopkins, 1934), and Quebec (Choqu- 

 ette, 1954). 



Morphologj': Described and figured by Hopkins (1931, 1934). 



Biology : Ocellate xiphidiocercariae develop in species of Musculium or Pisidiuni 

 and encyst in nymphs of mayflies or other aquatic insects or crustaceans 

 (Hopkins, 1934; Choquette, 1954). 



Crepidostomum farionis (O. F. Mueller, 1784) Braun, 1900 



Synonyms: Fasciola farionis O. F. Mueller, 1784 

 F. truttae Froelich, 1789 

 Distoma laureaium Zeder, 1800 

 Fasciola laureata (Zeder, 1800) Nermann, 1840 

 Crossodera laureata (Zeder, 1800) Cobbold, 1860 

 Distoma farionis (O. F. Mueller, 1784) Blanchard, 1891 

 Crepidostomum laurcatum (Zeder, 1800) Braun, 1900 

 Stephanophialia transmarina Nicoll, 1909 

 S. laureata (Zeder, 1800) Nicoll, 1909 

 S. farionis (O. F. Mueller, 1784) Faust, 1918 

 5". vitelloba Faust, 1918 

 Crepidostomum ussuruense Layman, 1930 

 C. vifellobmn (Faust, 1918) Hopkins, 1931 



Hosts: Sahno gairdneri Ore. Shaw, 1947 



Bangham & Adams, 1954 

 *Benton County 

 Bangham & Adams, 1954 

 Bangham & Adams, 1954 

 Bangham & Adams, 1954 

 Bangham & Adams, 1954 

 Bangham & Adams, 1954 

 Bangham & Adams, 1954 

 Bangham & Adams, 1954 

 Bangham & Adams, 1954 

 Bangham & Adams, 1954 

 Bangham & Adams, 1954 



* Asterisk.5 denote new (previously unpublished) reports of the parasite in tlie area. 



