widegreni, Coregonus Malmgren [A. J.] 1863:52 [325] [Kritisk öfversigt af Finlands fisk-fauna; ref. 13933] Northern part of Lake Ladoga, Russia; Lake Vättern, Sweden. Syntypes: Univ. of Helsinki. On p. 325 of German translation. •Synonym of Coregonus lavaretus (Linnaeus 1758) -- (Reshetnikov 1998:43 [ref. 23570] as widigreni). •Synonym of Coregonus lavaretus (Linnaeus 1758), but a valid subspecies -- (Berg 1948:374 [ref. 12882]). •Valid as Coregonus widegreni Malmgren 1863 -- (Kottelat 1997:119 [ref. 22952], Bogutskaya & Naseka 2004:143 [ref. 28183], Kottelat & Freyhof 2007:381 [ref. 29996], Romanov et al. 2017:824 [ref. 35687], Dyldin et al. 2020:113 [ref. 37569]). Current status: Valid as Coregonus widegreni Malmgren 1863. Salmonidae: Coregoninae. Distribution: Northern Europe. Habitat: freshwater, brackish, marine.