| Potamornis Fossil range: Late Cretaceous | |
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| Scientific classification
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Class |
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Subclass |
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Order |
Hesperornithiformes? |
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Family |
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Genus |
Potamornis |
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Potamornis is a prehistoric bird genus that dated back to the late Maastrichtian. Its scrappy remains were found in the Lance Formation at Buck Creek, USA, and a single species has been described: Potamornis skutchi.
This was almost certainly a member of the Hesperornithes, the hefty and toothed flightless diving birds of the Mesozoic seas. Its precise relationships are not all to clear; the quadrate bone is quite unique in some respects but apparently shares more apomorphies with the family Hesperornithidae - the "typical" Hesperornithes - in cladistic analysis[1]. Consequently, it might be considered a fossil hesperornithid with a different feeding specialization. Though it was heavily built like many (flying and flightless) diving birds, it weighed perhaps 1.5 or 2 kg. This raises the possibility that the Hesperornithes not only included flying members (see also Enaliornis), but that their families might have evolved flightlessness independently.
Gallery[]
Footnotes[]
- ^ Mortimer (2004)
References[]
- Mortimer, Michael (2004): The Theropod Database: Phylogeny of taxa. Retrieved 2008-AUG-14.
