56 TREMATODES OF THE PACIFIC NORTHWEST 



Family ZOOGONIDAE 



Zoogonoides viviparus (Olsson, 1868) Odhner, 1902 



Synonyms : Distoma viviparum Olsson, 1868 



Zoogonus viviparus (Olsson) of Looss, 1901 

 Zoogonoides subaequiporus Odhner, 1911 



Host: Microstonms pacificus Wash. Ching, 1960b 



Biology: The morphology and life cycle of Z. laevis was described by Stunkard 

 (1943). Dawes (1946) thought that Z. laevis might be a synonym of Z. 

 viviparus. 



Steganoderma formosum Stafford, 1904 



Host: Parophrys vetulus Wash. Ching, 1960b 



Digenetic trematodes of uncertain status 



Monostone cercariae 



Lehmann (1956) reported monostone cercariae encysted upon the rectal mesen- 

 tery of a single Amhystoma gracile from Oregon. 



Cercaria burti Miller, 1923 



H. M. Miller (1925b, 1927) reported this form from Lynmaea stagnalis from 

 Washington. He also reported it from Michigan (1923, 1926). It is a furcocer- 

 cous form. 



Cercaria sanjuanensis Miller, 1927 



H. M. Miller (1927) described Cercaria sanjuanensis from Lymnaca stagnalis 

 from Washington. It is a pharyngeal longifurcate form. 



Cercaria hirsuta Miller, 1927 



H. M. Miller (1927) described Cercaria hirsuta, a furcocercous form, from 

 Planorbis sp. from Washington. 



Cercaria granula Miller, 1927 



H. M. Miller (1927) described Cercaria granula, a furcocercous form, from 

 Planorbis sp. from Washington. 



Cercaria absurda Miller, 1927 



H. M. Miller (1927) described Cercaria absurda, a furcocercous cercaria, from 

 Planorbis sp. from Washington. 



Cercaria bulbocauda Miller, 1927 



This furcocercous cercaria was described from Planorbis sp. from Washington 

 by H. M. Miller (1927). 



Cercaria searlesiae Miller, 1925 



This cotylocercous cercaria was described from Searlcsia dira from Washington 

 by Miller (1925a). 



Cercaria foliata Miller, 1925 



An opthalmocercaria described by Miller (1925a) from Ptcrorytis {^Purpura) 

 foliata from Washington. 



