Liptornis is an extinct genus of fossil birds of uncertain affinities.
[2] It was described by Argentine palaeontologist Florentino Ameghino in 1894 from a large cervical vertebra from the Middle Miocene Santa Cruz Formation of Patagonia.
In his 1933 palaeornithological review, Lambrecht referred it only to the superfamily Sulides without placing it in a family.
[3] A later study has suggested family Anhingidae.
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