Lognkosauria

Lognkosauria is a group of extinct, large-bodied, herbivorous dinosaurs that lived during the Late Cretaceous period, approximately 99 to 66 million years ago. They are characterized by their long necks and tails, which are believed to have been used for grazing on vegetation. Lognkosauria is a suborder of ornithischian dinosaurs, which are distinguished by their bird-like hip structure.

The name Lognkosauria is derived from the Greek words "lognkos," meaning "long," and "sauros," meaning "lizard." This name reflects the group's distinctive feature of having long necks and tails. The most well-known members of Lognkosauria include Hadrosauridae, such as Edmontosaurus and Parasaurolophus, and Ankylosauria, such as Ankylosaurus and Stegoceras.

Lognkosauria is believed to have evolved from earlier ornithischian dinosaurs, such as the early Cretaceous Hypsilophodontidae. They are thought to have diversified during the Late Cretaceous, with Hadrosauridae becoming one of the most successful groups of dinosaurs, dominating ecosystems in North America and Asia. Ankylosauria, on the other hand, were more diverse and widespread, with members found on all continents.

The extinction of Lognkosauria at the end of the Cretaceous period is thought to have been caused by the same event that wiped out non-avian dinosaurs worldwide, the Chicxulub impactor. However, some species may have survived in isolated regions until the end of the Mesozoic era.