An organism belonging to the same genus as another organism; a relative species that shares the same closest taxonomic category.
From Latin 'congener,' combining 'con-' (together) and 'genus' (kind, race). Used in biological taxonomy since the 18th century to describe organisms in the same genus.
Lions and tigers are congeners—they're in the genus Panthera together. This single word captures the idea that some species are closer cousins than others, which was revolutionary when Carl Linnaeus developed it.
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