DIGENETIC TREMATODES 47 



Family ORCHIPEDIDAE 



Orchipedum tracheicola Braun, 1901 



Host : Olor buccinator B.C. Cowan, 1946 



For other hosts see Yamaguti (1958). 



Morphology: Described and figured by both Dawes (1946) and Skrjabin (1947a). 

 No life history is known for this genus or family. 



Family PARAMPHISTOMATIDAE 



Megalodiscus americanus Chandler, 1923 

 Hosts : 



Additional hosts from California (Lehmann, 1960) and Southeastern United 

 States (Chandler, 1923). 



Morphology: Described and figured by Skrjabin (1949). The life historj^ is not 

 known, but the history of the closely related M. tonperatus is known and 

 is discussed with that species below. 



Megalodiscus microphagus Ingles, 1936 



Synonyms: Diplodiscus microphagus (Ingles, 1936) Walton, 1938 

 Diplodiscus microphagus (Ingles, 1936) Manter, 1938 



Host: Dicamptodon ensatus Ore. McCauley & Pratt, 1959 



Additional liosts from California (Ingles, 1936). 



Morphology: Described and figured by Skrjabin (1949). 



Megalodiscus temperatus (Stafford, 1905) Harwood, 1932 



Synonyms : Diplodiscus temperatus Stafford, 1905 

 Megalodiscus ranophilus Millzner, 1924 

 Opisthodiscus americanus Roll, 1928 

 Cercaria inhabilis Cort, 1941 



Host: Rana aurora Ore. *Benton County 



Additional hosts listed in Yamaguti (1958), Skrjabin (1949), and Lehmann 

 (1960). 



Morphology: Described and figured in Skrjabin (1949). 



Biology: The life cycle as worked out by Krull and Price (1932) showed that 

 frogs became infected from eating C3'sts when they devoured their own 

 shed skin. The germ cell cycle was worked out by Van der Woude (1954). 

 Polysaccharides in this worm were investigated by Singh (1958). 



Asterisks denote new (previously unpublished) reports of the parasite in the area. 



