Hesperornitheans Temporal range:
Late Cretaceous, | |
---|---|
![]() | |
Restored skeleton of Hesperornis regalis | |
Scientific classification ![]() | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Clade: | Dinosauria |
Clade: | Saurischia |
Clade: | Theropoda |
Clade: | Avialae |
Clade: | Ornithurae |
Clade: | †Hesperornithes Fürbringer, 1888 |
Subgroups[4] | |
| |
Synonyms | |
Hesperornithes is an extinct and highly specialized group of aquatic avialans closely related to the ancestors of modern birds. They inhabited both marine and freshwater habitats in the Northern Hemisphere, and include genera such as Hesperornis, Parahesperornis, Baptornis, Enaliornis, and Potamornis, all strong-swimming, predatory divers. Many of the species most specialized for swimming were completely flightless. The largest known hesperornithean, Canadaga arctica, may have reached a maximum adult length of 2.2 metres (7.2 ft).[5]
Hesperornitheans were the only Mesozoic avialans to colonize the oceans. They were wiped out in the Cretaceous–Paleogene extinction event, along with enantiornitheans and all other non-avian dinosaurs.
clarke2004
was invoked but never defined (see the help page).© MMXXIII Rich X Search. We shall prevail. All rights reserved. Rich X Search