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Ichthyornis ancestors(was Re: birds/dino-birds with teeth

>>But then the toothless pmx of Hesperornithiformes and
Ichthyornithidae is totally counterintuitive... or means that they inherited
this feature from an ancestor which did something else with its beak.<<
What do the very early ichthyornithiforms and hesperorniforms look like?  I do
remember talk (from HP Marjanovic, actually) about volant hesperorns, but aside
from that, I am ignorant.