Long-standing taxonomic and nomenclature issue of <italic>Lemmus obensis chrysogaster</italic> Allen, 1903 (Rodentia, Cricetidae) resolved.

The taxonomic status and nomenclature of the golden lemming (<italic>Lemmus obensis chrysogaster)</italic> remained a puzzle for more than 100 years. It was considered either as an independent species <italic>Lemmus</italic><italic>chrysogaster</italic> or as a subspecies of <italic>Lemmus trimucronatus</italic> or <italic>Lemmus sibiricus</italic>. In the most authoritative checklists, without further evidence, it was transferred to the synonym of <italic>Lemmus amurensis</italic>. However, the type material and specimens from type locality have not been revised since 1903. Here we fill this gap. The sequence of the cytochrome <italic>b</italic> gene from topotype clearly indicates that the golden lemming is a younger synonym of <italic>L. trimucronatus</italic>. [ABSTRACT FROM AUTHOR]