The earliest known hesperornithine is the Early Cretaceous " Enaliornis ".
2.
""'Enaliornis " "'is a genus of hesperornithine birds which lived in the early Late Cretaceous, making it the oldest known hesperornithine.
3.
This raises the possibility that the Hesperornithes not only included flying members ( see also " Enaliornis " ), but that their families might have evolved flightlessness independently.
4.
In particular " Enaliornis ", which was apparently an ancestral and plesiomorphic member of that order, was sometimes used to support claims of Albian ( Early Cretaceous ) Gaviiformes.
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