and the contemporary Talarurus, these taxa were divided by niche partitioning. In a palatal view, the rostra Talarurus have a broad-like, rectangular shape, while Tsagantegia have a more shovel-like shaped rostra. These morphological differences indicate that Tsagantegia filled the niche of a browser herbivore, while Talarurus was a grazer. Caliche-based boundary indicates a semi-arid environment and climate, but also, the presence of fluvial and lacustrine sediments are indicators of large rivers and lakes. As interpreted by Hicks et al. 1999, during the times of the Bayan Shireh Formation, large rivers drained the eastern part of the Gobi Desert. Additional to this, fossil fruits remains have been recovered from the Bor Guvé and Khara Khutul localities (Upper and Lower Bayan Shireh, respectively), suggesting the presence of Angiosperm plants. Tsagantegia shared its habitat with numerous animals from other localities of the formation, compromising dinosaur and non-dinosaur genera; such as the theropods Achillobator, Alectrosaurus, Erlikosaurus, Garudimimus and Segnosaurus; the fellow ankylosaur Talarurus; Marginocephalians: Amtocephale and Graciliceratops; the hadrosauroid Gobihadros, and the large sauropod Erketu. The turtle Lindholmemys, the crocodylomorph Paralligator, unnamed azhdarchids and the shark Hybodus. See also Timeline of ankylosaur research Cretaceous Mongolia Victoria Arbour References Ankylosaurids Late Cretaceous dinosaurs of Asia Gobi Desert Fossil taxa described in 1993 Ornithischian genera