plesiosaurs Libonectes, Styxosaurus, Thalassomedon, Terminonatator, Polycotylus, Brachauchenius, Dolichorhynchops and Trinacromerum; the mosasaurs Mosasaurus, Halisaurus, Prognathodon, Tylosaurus, Ectenosaurus, Globidens, Clidastes, Platecarpus and Plioplatecarpus; and the sea turtles Archelon, Protostega, Porthochelys and Toxochelys. The flightless aquatic bird Hesperornis also made its home there. The pterosaurs Pteranodon and Nyctosaurus, and the bird Ichthyornis, are also known far from land. See also List of plesiosaur genera Timeline of plesiosaur research References Bibliography External links Elasmosaurus platyurus on Oceans of Kansas Where the Elasmosaurs roam: Separating fact from fiction Late Cretaceous plesiosaurs of North America Elasmosaurids Taxa named by Edward Drinker Cope Fossil taxa described in 1868 Sauropterygian genera