Formica congerens Nylander, 1846 junior synonym of current valid taxon Formica lugubris Zetterstedt, 1838
Formica congerens Nylander, 1846a: 906 (w.) FINLAND. Palearctic.
Primary type information: Type-material: lectotype worker (by designation of Seifert, 2021: 164). Type-locality: Finland: Mjölön island near Helsinki (Nylander). Type-depository: ZMHF. Secondary type information: Paratype-material: 4 paralectotype workers. Paratype-localities: 1 paralectotype worker with same data as lectotype, 3 paralectotype workers with no locality specified. Paratype-depository: ZMHF.
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