Glishades Facts
| Diet | Herbivore |
| Height | Unknown due to fragmentary remai |
| Length | Unknown due to fragmentary remai |
| Environment | Land |
| Era | Cretaceous |
| Period | Late Cretaceous |
| Type | Ornithopod |
| Location | North America |

| Diet | Herbivore |
| Height | Unknown due to fragmentary remai |
| Length | Unknown due to fragmentary remai |
| Environment | Land |
| Era | Cretaceous |
| Period | Late Cretaceous |
| Type | Ornithopod |
| Location | North America |
Glishades is a controversial ornithopod dinosaur known from extremely limited fossil remains found in the Late Cretaceous rocks of Montana. Dating to approximately 74.5 million years ago, this creature represents one of the challenges palaeontologists face when working with fragmentary fossils - determining whether they represent genuine new species or known dinosaurs at different life stages.
The entire scientific understanding of Glishades rests upon just two partial premaxillae (upper jaw bones) discovered in the upper Two Medicine Formation. These bones were initially interpreted as belonging to a primitive ornithopod, possibly related to Bactrosaurus from Asia. However, the limited nature of these remains has made definitive classification extremely difficult.
Like other ornithopods of its time, Glishades would have been a plant-eater, using its beak-like mouth to crop vegetation. The Two Medicine Formation during the Late Cretaceous was a lush, subtropical environment with abundant ferns, conifers, and flowering plants that would have provided ample food for herbivorous dinosaurs.
The scientific validity of Glishades remains hotly debated. Some researchers suggest these fossil fragments may actually belong to a juvenile member of a well-known hadrosaurid species rather than representing a distinct genus, highlighting how challenging it can be to identify new species from incomplete remains.
Known only from two partial upper jaw bones, making distinguishing features difficult to determine. The premaxillae show characteristics that initially suggested a primitive ornithopod relationship, though this interpretation is disputed.
Behaviour cannot be reliably inferred due to the extremely fragmentary nature of the fossil remains. As an ornithopod, it would likely have been a social herbivore that moved in herds across the Late Cretaceous landscapes of Montana.
Glishades was first described by Albert Prieto-Márquez in 2010. The original fossils were discovered at Two Medicine Formation, Montana, USA.