bernissartensis

Bernissartensis is a genus of extinct hadrosaurid dinosaur, commonly referred to as a "duck-billed dinosaur," known primarily from the Late Cretaceous period, approximately 66 million years ago. The name Bernissartensis derives from the Belgian town of Bernissart, where the first fossils were discovered in the late 19th century. The type species, Glyptodon bernissartensis, was initially classified under the genus Glyptodon, but later studies reclassified it under Bernissartensis based on distinct anatomical differences.

Fossil remains of Bernissartensis were unearthed in the Bernissart coal mines in the 1870s and 1880s, yielding an exceptionally complete skeleton. The specimen, housed in the Royal Belgian Institute of Natural Sciences, consists of over 100 bones, including parts of the skull, limbs, and vertebrae. This discovery provided significant insights into the anatomy and behavior of hadrosaurids, particularly their robust build and specialized chewing apparatus.

Bernissartensis is estimated to have reached lengths of up to 8 meters (26 feet) and stood about 3 meters (10 feet) tall at the hip. Like other hadrosaurids, it possessed a broad, flat snout adapted for grazing on vegetation. Its teeth were arranged in battery-like rows, allowing efficient processing of tough plant material. The presence of a crest on the skull, though not as prominent as in some relatives, suggests possible social or sexual display functions.

The genus is closely related to other European hadrosaurids such as Telmatosaurus and Pararion. Its fossils are primarily found in the upper Cretaceous strata of Belgium, though isolated remains have been reported in other parts of Europe. The well-preserved Bernissart specimen remains one of the most important fossil discoveries in Belgian paleontology, contributing valuable data to the understanding of hadrosaurid evolution and ecology during the Late Cretaceous.