Hesperornithiformes A clade in the dinosaur family tree. The entries below are classified within it. Enaliornis barretti 106.3–100.5 Mya Pasquiaornis hardiei 95–93 Mya · North America Chupkaornis keraorum 89–85 Mya · Japan Fumicollis hoffmani 86–82 Mya Potamornis skutchi 67–66 Mya · Montana, USA Pelagornis 41–2.6 Mya