German naturalist Johann Georg Wagler, who first described the Pinnated Bittern in 1829, placed it in the genus Ardea at that time.
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Johann Georg Wagler writes descriptions of new bird species in Isis, oder Encyclopädische Zeitung published by Lorenz Oken Some are: the Russet-throated Puffbird, the Golden-fronted Woodpecker, the Pinnated Bittern, the Chestnut-coloured Woodpecker, the Brown Jay, the Intermediate Egret and the Ladder-backed Woodpecker