14 TREMATODES OF THE PACIFIC NORTHWEST 



Family ALLOCREADIIDAE 



Allocreadium lobatum Wallin, 1909 



Hosts : Salmo gairdneri kamloops B.C. Bangham & Adanis, 1954 



Catostomiis catostomus B.C. Bangham & Adams, 1954 



Prosopiuin williamsoni B.C. Bangham & Adams, 1954 



Piychocheilus oregonensis B.C. Bangham & Adams, 1954 



Couesius plumbeus B.C. Bangham & Adams, 1954 



Mylocheilus caurimun B.C. Bangham & Adams, 1954 



Additional hosts have been reported from New York (Mueller, 1934), 

 Maine (Wallin, 1909), Wisconsin (Pearse, 1924; Fischthal, 1950), Delaware 

 (Hunninen, 1936), Quebec (Bangham and Venard, 1946), Wyoming (Bang- 

 ham, 1951). 



Morphology: Mueller (1934) partiallj' described this form. 



Biolog}^ : The life history of this form is not known, but that of another species 

 in this genus has been worked out by Seitner (1951). 



Bunodera eucaliae (Miller, 1936) Miller, 1940 



Synonym : Bimodcrina eucaliae Miller, 1936 



Hosts : Gasterosteus aculeatus B.C. Bangham & Adams, 1954 



Eucalia inconstans B.C. Bangham & Adams, 1954 



Gasterosteus aculeatus Ore. *Benton Count}- 



Additional hosts have been reported from Maine (Mueller, 1936), Wiscon- 

 sin (Bangham, 1944), and Lake Huron (Bangham, 1955). 



Morphology: The onlj^ description is the original one by Miller (1936). 



Biolog)': Hoffman (1955) has worked out the life cycle but has not proved it 

 experimentally. The cercariae develop in a clam of the genus Pisidiwn and 

 do not require a second intermediate host. 



Crepidostomum cornutum (Osborn, 1903) StafFord, 1904 



Synonyms : Bunodera cornuta Osborn, 1903 



Distonium nodulosum (Zeder, 1800) Wright, 1884 

 Distoinuii! auritus MacCallum, 1918 (?) Hopkins, 1934 



Host: Gasterosteus aculeatus Ore. *Linn County 



Additional hosts have been listed by Hopkins (1934) from Ontario, Michi- 

 gan, New York, Illinois, Mississippi, Quebec, Ohio, Wisconsin, Alabama, and 

 Louisiana. 



Morphology: This form was described in detail by Hopkins (1934) but was not 

 figured in his paper. 



Biologj' : Oculate xiphidiocercariae develop in Mtisculium or Sphaerinui and 

 encyst in crayfish. Contributions to the life history have been made bv Bang- 

 ham (1926), Hopkins (1933), Abernathy (1937)^ Ameel (1937), Henderson 

 (1938), Hussey (1941), Parker (1941), and Cheng (1957b). Cheng and 

 Jcuues (1960) described some of the embryology. 



Asterisks denote new (previously unpublished) reix)rts of the parasite in the area. 



