Hesperornithidae A clade in the dinosaur family tree. The entries below are classified within it. Lestornis 100.5–66 Mya Coniornis 89.8–66 Mya Hargeria 89.8–66 Mya Parahesperornis alexi 85–82 Mya · North America Canadaga 83.6–67 Mya · Asia Hesperornis 83.6–72 Mya · North America Asiahesperornis bazhanovi 70 Mya · Asia