Researchers discovered the cranium of a large sea bird from the Pelagornithidae family in Peru.
2.
It also provides leeway should the proposed separation of the Pelagornithidae into several families turn out to be appropriate.
3.
But these are probably all closely related to the better-known " Pelagornis ", type genus of the family Pelagornithidae.
4.
As regards the bare parts, all the presumed close relatives of the Pelagornithidae quite often have rather bright reddish colours, in particular on the bill.
5.
In any case, the family name of the pseudotooth birds, Pelagornithidae, as the senior synonym has widely replaced the once-commonly used Pseudodontornithidae.
6.
While " Hesperornis " is not thought to have left descendants, the earliest families, the Pelagornithidae and the Plotopteridae ( a group of large seabirds that looked like the penguins ).
7.
As regards the supposed Cyphornithidae, most if not all pseudotooth birds placed there are probably closely related to the better-known " Pelagornis ", type genus of the family Pelagornithidae.
8.
The presumed family " Pelagornithidae ", deemed invalid nowadays, had been recognized as pseudotooth birds all along, as they were established based on skull fossils preserving parts of the " toothed " beak.
9.
And even if " Cyphornis " is the senior synonym of all the later-described genera ( which is not very likely ), according to the rules of zoological nomenclature the family name Pelagornithidae would not change.
10.
Rather, it is likely that the huge pseudotooth birds form a clade, and in this case, Pseudodontornithidae like Cyphornithidae and Dasornithidae is correctly placed in the synonymy of Pelagornithidae even if several families were accepted in the Odontopterygiformes.
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