Tarchia, meaning “brainy one,” is a genus of ankylosaurid dinosaur from the Campanian-Maastrichtian stages of the Late Cretaceous Period of what is now Mongolia. It was taken from the Barun Goyot Formation (previously called the “˜Lower Nemegt Beds”˜). It is currently the geologically youngest known of all Asian ankylosaurid dinosaurs and is represented by at least five specimens.

Tarchia currently includes only the type species, T. gigantea. Despite the rocks, in which the specimens were found, represented environments with small intermittent lakes and seasonal streams, Tarchia for the most part, was a desert animal.

Tarchia is one of the largest known Asian ankylosaurid, with an estimated body length of 26 to 28 feet, a skull length of 16 inches, skull width of 18 inches, and could have weighed as much as 5 tons (10,000 pounds). It had a bony tail club, like many ankylosaurids.

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