DIGENETIC TREMATODES 31 



Derogenes crassus Manter, 1934 



Hosts : Ophiodon elongatus Ore. McCauley, 1960 



Sebastodes paucispinus Ore. McCauley, 1960 



This parasite has been reported from Florida (Manter, 1934), Japan 

 (Yamaguti, 1938) and Tasmania (Crowcroft, 1947). 



Morphology: This was described in detail only by Manter (1934). Nothing is 

 known of the life history. 



Derogenes various (Mueller, 1784) Loess, 1901 



Synonyms: Fasciola varica Mueller, 1784, of Rudolphi, 1802 

 Distoma varicum Zeder of Rudolphi, 1809 

 Distomum dendriticwm Creplin, 1829, in part 



Derogenes varicum (Mueller, 1784) of Olsson, 1868, and Levinsen, 

 1881, nee Monticelli, 1890 



Hosts : Ophiodon elongatus 



Ophiodon elongatus 

 Sebastodes maliger 

 Sebastodes maliger 

 Sebastodes caurinus 

 Leptocottus armatus 

 Clinocottus embryum 

 Microgadus proximus 

 Gasterosteus aculeatus 

 Plaiichthys st el lotus 

 Porichthys notatus 

 I sop set ta isolepis 



This trematode probably has the largest host list of any trematode of 

 fishes. It has been reported from Europe (Nicoll, 1915b; Tosh, 1905; Rees, 

 1953; Olsson, 1868; Looss, 1901; Issaitschikow, 1928, 1933; Dogeli and Rosova, 

 1941; Schulman and Schulman-Albova, 1953; Poljanskv, 1955); the East Coast 

 of North America (Stafford, 1904; Miller, 1941; Manter, 1926, 1934; Heller, 

 1949; Linton, 1940). from the South Atlantic (Szidat, 1955), Japan (Yamaguti, 

 1953), New Zealand (Manter, 1954), and Galapagos (Manter, 1940). 



Taxonomy: Dawes (1946) placed several other species of Derogenes in synonymy 

 with D. varicus but this was not generally accepted (Manter, 1954; Ya- 

 maguti, 1953, 1958). 



Morphology : There are adequate morphological descriptions and figures by 

 Odhner (1905), Manter (1926), and Lloyd (1938). Nothing is known of the 

 life historJ^ 



Derogenes sp. 



Shaw (1947 described Derogenes sp. from Sahno gairdneri from Oregon. 

 We have examined this form from the same host, from Sabna clarki, Oncor- 

 hynchus kisutch, and O. tsliazvytscha and believe it to be an undescribed species. 

 It will be described elsewhere. 



