A shepherd in Patagonia discovered a nearly complete fossil of a small dinosaur species, providing rare insight into its anatomy and growth.
The fossil includes key skeletal elements missing from other specimens
The find consists of both collarbones, shoulder blade fragments, all upper and lower arm bones and pieces of vertebrae, ribs, thigh bones, and pelvis. Study leader Fred Grine noted that only three other highly fragmentary partial skeletons of this species exist. The completeness allows for more accurate anatomical comparisons.
Bone measurements indicate a young adult about 1.6 meters tall and 31 kilograms
Researchers estimated the animal’s size using the length of its humerus, identifying it as a young adult. Weight was inferred from leg bone fragments, resulting in a remarkably low mass for its height. This suggests a gracile build unlike larger contemporaneous dinosaurs.
The discovery improves understanding of species diversity in Late Cretaceous Patagonia
By filling gaps in the fossil record, the specimen helps clarify the range of body sizes among dinosaurs in the region. It supports hypotheses about niche partitioning in ecosystems dominated by larger herbivores and carnivores. The fossil dates to the same period as other known Patagonian dinosaur assemblages.
How rare is it to find such a complete skeleton of this dinosaur?
According to the study, only three other partial and highly fragmentary skeletons of this species have been found previously.
What does the fossil’s size and weight suggest about its lifestyle?
The small size and low weight indicate a lightly built, possibly agile dinosaur, contrasting with larger species in the same environment.
