Leptothorax acervorum nigrescens Ruzsky, 1905 junior synonym of current valid taxon Leptothorax acervorum (Fabricius, 1793)
Leptothorax acervorum var. nigrescens Ruzsky, 1905b: 614 (in text) (w.) RUSSIA. Palearctic.
Primary type information: Type-material: syntype workers (number not stated). Type-locality: Russia: Ural, Altai (M. Ruzsky). Type-depository: ZMUM.
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