26 TREMATODES OF THE PACIFIC NORTHWEST 



Tetracotyle sp. 



Tetracotyle is a "generic" name for metacercariae of diplostomid trema- 

 todes which are unencysted, bear a pair of lateral cotylae (suckers), and in 

 which the adult form is unknown. Bangham and Adams (1954) listed the fol- 

 lowing fresh water fish from British Columbia as hosts of Tetracotyle: 



Prosopium williamsoni Cafosto}nus catostomus 



Oncorhynchus nerka C. macroclieilus 



Salvelinus malma Mylocheilus caurinuin 



Cotiesius plumbeus Richardsonius balieatns 



Ptychocheilus oregonensis Gasterosteus aculeatus 



Eticalia inconstans Cottus asper 

 Cottus rhotheus 



Cercaria sp. 



Hunter et al. (1949) reported a "strigeid" cercaria from Lymnaea pahistris 

 from Washington. 



Family ECHINOSTOMATIDAE 



Aporchis continuus McCauley and Pratt, 1960 



Host: Lartis caniis Ore. McCauley & Pratt, 1960 



There are no other records. 

 Ecbinoparyphium contiguum Barker and Bastron, 1915 



Host: Ondatra zibethica B.C. Ivnight, 1951 



Hosts from other areas have been reported by Swales (1933) and Olsen 

 (1938). 



Morphology: Redescribed by Knight (1951) and described and figured in 

 Skrjabin and Baschkirova (1956). 



Ecbinoparyphium recurvatum (Linstow, 1873) Dietz, 1909 



Synonyms : Distomum recurvatum Linstow, 1873 



Echinostomum recurvatum (Linstow, 1873) Stossich, 1892 



Host : "Naturally infected snails" Ore. Senger, 1954 



Additional hosts from other areas were listed by Yamaguti (1958). 



Morphology: This form was figured and described by Skrajabin and Basch- 

 kirova (1956). The embrj-ology and development of the excretory system of 

 the cercariae were described by Kuntz (1953). 



Biology : This parasite develops in various snails and the cercariae encyst in 

 the same snail, another snail, or less frequently in some other animal. 

 Gmitter (1955) reported it from Lymnaea pcrcgra in Czechoslovakia, Harper 

 (1929) reported it from Valvata piscinalis, Mathias (1926, 1927) reported it 

 from various species of Planorbis, Cyclas, and Lymnaea, and Bittner (1925) 

 showed metacercariae to occur in Rana temporaria. 



This worm has been shown to cause the death of mute swans in Great 

 Britain (Soulsby, 1955). 



