ludoga, Coregonus widegreni Berg [L. S.] (ex Polyakov) 1916:97 [Les Poissons des eaux douces de la Russie; ref. 277] Techincally the above combination is subjectively invalid, preoccupied by Coregonus ludoga Polyakov 1874 when Polyakov's name is regarded as a replacement name. •Questionably a synonym of Coregonus widegreni Malmgren 1863 -- (Kottelat 1997:119 [ref. 22952]). 1°Homonym. Current status: Uncertain as Coregonus widegreni Malmgren 1863. Salmonidae: Coregoninae. Habitat: freshwater, brackish, marine.