DIGENETIC TREMATODES 45 



Podocotyle atomon (Rudolphi, 1802) Odhner, 1905 



Synonyms : Fasciola atomon Rudolphi, 1802 

 Distoma atomon Rudolphi, 1809 

 D. simplex Rudolphi, 1809 of Olsson, 1868 

 D. angulatiim Dujardin, 1845 



AUocrcadium atomon (Rudolphi) of Odhner, 1901 

 Sinistropus simplex Stafford, 1904, in part 

 Psilostomiim rcdactum Nicoll, 1906 

 Distomum vitcllosiim Linton of Johnston, 1907 

 ? Fasciola aeglefini Mueller, 1776, in part 

 Podocotyle atomon var. dispar Nicoll, 1909 

 The above synonymy is after Dawes (1946). 



Hosts: Leptocottus armatus B.C. McFarlane, 1936 



Syngnathus griseo-lineatus B.C. McFarlane, 1936 



Epigeichthys atropurpurens B.C. McFarlane, 1936 



Hexagrammos stcllcri B.C. McFarlane, 1936 



Additional hosts have been reported from Europe (Dawes, 1946, 1947; Pal- 

 ombi, 1934; Rees, 1945) and New England (Manter, 1926; Linton, 1940; Hun- 

 ninen and Cable, 1943a). 



Morphology: Dawes (1946, 1947) presented a short description of the species; 

 Odhner (1901, 1905), Linton (1940), and Manter (1926) have described the 

 species adequately; and Hunninen and Cable (1943) added a few notes to 

 the description and figured it well. 



Biology : Cotylomicrocercous cercariae are produced in sporocysts in Littorina 

 rudis and penetrate and encyst in marine amphipods. Metacercariae are 

 progenetic or may develop in the definitive host (Hunninen and Cable, 

 1943a). Shulman (1950) found a similar life history in the White Sea. 

 Jones (1933) discussed fertilization and egg formation. 



Podocotyle abitionis McFarlane, 1936 



Hosts : Sehastodes sp. B.C. McFarlane, 1936 



Sehastodes maligcr Wash. Ching, 1960b 



Not known outside of the Pacific Northwest. Life history of this species 

 tinknown. For life history of a related species see under P. atomon above. 



Podocotyle olssoni Odhner, 1905 



Synonym : Distoma simplex Rudolphi, 1809 of Olsson, 1868 



Host : Leptocottus armatus Ore. *Coos County 



Additional hosts have been reported from Sweden (Odhner, 1905), and New 

 England (Manter, 1926; Linton, 1940). 



Morphology: Described by Odhner (1905) and Manter (1926). Life history 

 unknown. For life history of a related species see P. atomon above. 



* Asterisks denote new (previously unpublished) reports of the parasite in the area. 



