DIGENETIC TREMATODES 37 



Morpholog>-: Described and figured in Dawes (1946) and Morosov (1952). 

 Morosov also included a long bibliography on this form. 



Biologj' : Metacercariae encyst on the skin of frogs and are there eaten by 

 the definitive host, according to Joyeaux, Baer, and Carrere (1934). In 

 the Pacific Northwest metacercariae have been found on the surface of 

 Rana aurora and Rana aurora cascadae (Senger and Macy, 1952). 



Galactosomum humbargari Park, 1936 



Hosts : Larus calif amicus 



L. heermanni 

 L. glaucescens 

 L. Philadelphia 



Mustela vison 



Calif. Park, 1936 



Wash. Ching, 1960a 



Wash. Ching, 1960a 



Wash. Ching, 1960a 



Metagonimoides oregonensis Price, 1931 



Hosts : Procyon lotor Ore. 



Ore. 



Burns & Pratt, 1952; Shaw, 

 1947; Price, 1931 

 Senger & Neiland, 1955 



Additional hosts from Georgia were given by Sawyer (1958). 



Morpholog\': Redescribed by Morosov (1952). 



Biology: Cercariae develop in Oxytrema silicula in Oregon and either leave 

 the snail and encyst in a frog or develop into metacercariae within the 

 redia. In either case the worm reaches the definitive host bj^ this host 

 eating the snail or frog. The metacercariae have been reported from Rana 

 aurora (Burns and Pratt, 1952). 



Family LECITHODENDRIIDAE 



Acanthatrium oregonense Macy, 1939 



Synonym: Prosthodendrium (acantliafriuiii) oregonense (Macy, 1939) Ya- 

 maguti, 1958 



Hosts : 



Not known from otlier areas. 



Taxonomy: Yamaguti (1958) stated that Skarbilovich (1948) placed this in 

 the subgenus Acanthatrium of Prosthodendrium, but this is in error as 

 Skarbilovich (1948) placed it in the subgenus Acanthatrium of the genus 

 Acanthatrium. Cheng (1957a) gave a key to 14 species of the genus. 



Biolog}- : Virgulate xiphidiocercariae develop in Oxytrema silicula in Oregon, 

 then enter caddis fly larvae where they move about unencysted. Tliey ap- 

 parentlv reach the chiropteran host after the metamorphosis of the insect 

 (Knight and Pratt, 1955). 



Morphology: See Macy (1939 )and Cheng (1959). 



