Unicinctus

Unicinctus is a genus of small to medium-sized dinosaurs that lived during the Late Cretaceous period, approximately 75 million years ago. The name "unicinctus" is derived from Latin, meaning "one-belted," referring to the single row of small, circular bones found on the underside of the tail. This unique feature is one of the defining characteristics of the genus.

Fossils of unicinctus have been found in North America, particularly in the Hell Creek Formation of Montana and South Dakota. The most well-known species is Unicinctus brevis, which was one of the last non-avian dinosaurs to go extinct. Unicinctus is believed to have been a bipedal herbivore, with a long, slender snout and a relatively small body size compared to other dinosaurs of its time.

The genus is notable for its distinctive tail structure, which is thought to have been used for balance and stability during movement. The tail also likely played a role in courtship displays and territorial behavior. Unicinctus is an important part of the fossil record, providing valuable insights into the diversity and evolution of dinosaurs during the Late Cretaceous period.