New 235-Million-Year-Old Dinosaur from Mongolia Reveals Early Global Dispersal of the First Dinosaurs!

Paleontologists have announced Mongolodinosaurus triᴀssicus, a 235-million-year-old basal dinosaur from the Middle Triᴀssic of Mongolia whose discovery proves that the first dinosaurs spread across both Gondwana and Laurasia far earlier than previously believed.

Recovered from the Tsagaan-Ovoo Formation in the Gobi Desert, the partial skeleton includes a nearly complete skull, neck, forelimbs, and pelvis of a lightly built, bipedal animal roughly 2 meters long. Anatomical features — such as an open acetabulum, elongated metatarsals, and a reduced fourth trochanter — confirm it is a true dinosaur, most likely a basal saurischian.

Lead author Dr. Khishigjav Tsogtbaatar (Mongolian Academy of Sciences) states: “This is the oldest dinosaur known from Asia. Its presence in Laurasia at 235 million years ago shows that dinosaurs dispersed out of their Gondwanan cradle almost immediately after they first appeared.”

Previously, the earliest undisputed dinosaurs were known only from South America and southern Africa around 233–230 Ma. Mongolodinosaurus pushes the Asian record back by at least 5 million years and suggests rapid northward migration across the Tethys region during the Middle Triᴀssic.

The find also fills a critical gap between earlier dinosauromorphs and later Jurᴀssic dinosaurs, showing that the initial radiation was already global. CT scans reveal a lightweight skull and agile limbs consistent with a fast, small predator or omnivore in a warm, seasonal environment.

This discovery forces a major revision of dinosaur origins: the first dinosaurs were not confined to southern continents but quickly colonized northern landmᴀsses, setting the stage for their later dominance. As more Mongolian Triᴀssic sites are explored, Mongolodinosaurus promises to illuminate how these revolutionary reptiles first conquered the world.