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Researchers knew they were dealing with a new taxon based on the autapomorphies -- distinctive derived characteristics -- of several parts of the skeleton.

The posterior process of the ulna -- the larger of the forearm bones -- is hooked-shaped, the proximal part of the ulna is crescent-shaped, and a groove structure is present at the posterodistal surface of the fibula -- traits not seen in other species of sauropods that may have helped with weight distribution on the massive dinosaur, according to the paper.

The dinosaur likely resided in forested river and lakeside environments, which were prevalent in the region at the time, the researchers said.

Also found at the site were some bony fish scales and teeth and incomplete plesiosaurian teeth, indicating a humid climate and complex ecosystem, according to the paper.

Phylogenetic analysis reveals that H. qini is likely the oldest sauropod in South China -- dating to the early to middle Jurassic, between 200 million to 162 million years ago, according to the paper. This predates previously known sauropod fossils from the region by about 30 million years.

\"PHOTO:
De Agostini Picture Library via Getty Images
PHOTO: Illustration of Mamenchisaurus eating leaves of tree branch.
>

The new species is the second eusauropod -- a group derived from sauropods -- found in Guangxi. Jingia dongxingensis was excavated from the Dongxing Formation and was named a new genus and species in 2024.

Sauropods are herbivores known for their very long necks, long tails, small head and pillar-like legs.

The research team consisted of scientists from the Guangxi Museum of Natural History, the Cultural Relics Administration of Ningming County and the Institute of Vertebrate Paleontology and Paleoanthropology of the Chinese Academy of Sciences.

The finding increases the understanding of the diversity of Jurassic-era eusauropods in China and how they evolved, the researchers said.

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