ichthyornithes造句

• "' Ichthyornithes "'is an extinct group of toothed enantiornitheans, all other non-avian dinosaurs, and many other animal and plant groups.
• Thus, the " Gallornis " fossils suggest that as early as about 130 million years ago or more the ancestors of all living birds might already have been an evolutionary lineage distinct from the closely related Hesperornithes and Ichthyornithes ( essentially modern birds retaining some more ancient features like teeth ) and the more distantly related Enantiornithes ( a group of more primitive toothed birds which were the most successful avians in the Mesozoic ).