16 TREMATODES OF THE PACIFIC NORTHWEST 



Bangham and Adams (1954) considered this to be the principal parasite 

 o£ fresh water fish of British Columbia. Hopkins (1934) summarized the 

 distribution of this form and reported it from most of northern Europe, Siberia, 

 and Great Britian, as well as from Alaska, Montana, Wyoming, and Vermont. 

 Recent workers have reported it from Czechslovakia (Dyk, Lucky, and Valenta, 

 1954), Wales (Thomas, 1958), Quebec (Bangham and Venard, 1946), Wyoming 

 (Bangham, 1951) and California (Haderlie, 1953). Yamaguti (1958) stated that 

 it had been reported from Morocco but did not cite his reference. This reference 

 is unexpected since all other records are boreal. This is primarily a parasite of 

 salmonid fishes, though a few other hosts have been reported. 



Morphology: This form has been redescribed in detail by Hopkins (1934). 



Biology: Thomas (1958) discussed the general biology of the species. The life 

 history has been worked out by Brown (1927) and Crawford (1943). 

 Ocellate xiphidiocercariae develop in species of Pisidium and encyst in 

 species of mayfly. 



Crepidostomum isotomum Hopkins, 1931 



Host: Cottus asper B.C. Bangham & Adams, 1954 



This form has been previously reported only by Hopkins (1931, 1934) 

 from Illinois. 



Morphology: Described only by Hopkins (1931, 1934). 



Biology: Hopkins (1934) has worked out the life history with admittedly weak 

 evidence and has found ocellate xiphidiocercariae to develop in Sphaerium 

 and encyst in mayfly nymphs. 



Crepidostomum sp. 



Forms reported as Crepidostomum sp. have been reported from British 

 Columbia by Bangham and Adams (1954) from Thymallus arcticiis and Lota 

 lota. Shaw (1947) reported Crepidostomum sp. from Salmo clarki and Salvelinus 

 fontinalis from Oregon. 



Plagiocirrus primus Van Cleave and Mueller, 1932 



Host: Catostomus macrocheilus Idaho Fritts, 1959 



Reported by Van Cleave and Mueller (1932, 1934) from New York, and 

 has not been reported elsewhere. The description by Van Cleave and Mueller is 

 adequate and figures appear in both the 1932 and 1934 papers. 



Plagiocirrus testeus Fritts, 1959 



Host : Catostomus machrocheilus Idaho Fritts, 1959 



This is the only paper which mentioned this species. 



Plagiocirrus sp. 



Bangham and Adams (1954) reported Plagiocirrus sp. from Catostomus 

 catostomus from British Columbia. 



AUocreadiidae 



Grifiith (1953) reported AUocreadiidae from Catostomus macrocheilus from 

 Eastern Washington. 



