“…Environmental conditions during the time of deposition have been interpreted as arid and highly seasonal (Ashraf et al 2010;Li et al 2014;Fang et al 2015Fang et al , 2016. The diverse vertebrate fauna of the Qigu Formation thus far comprises hybodont sharks, actinopterygian fishes, temnospondyl amphibians, mammals, xinjiangchelyid turtles, squamates and choristoderes, crocodylomorphs, pterosaurs, as well as sauropods, small and large theropods, stegosaurs and ankylosaurs among dinosaurs (Maisch et al , 2004a(Maisch et al , b, 2005Maisch and Matzke 2005, 2017Wings et al 2007;Schellhorn et al 2009;Martin et al 2010;Richter et al 2010;Augustin et al in press). The mammal assemblage is particularly rich and comprises five different taxa: the haramiyid Sineleutherus; two docodonts, Tegotherium and Dsungarodon; the stem zatherian Nanolestes; and an indeterminate amphilestid triconodont (Pfretzschner et al 2005;Maisch et al 2005;Martin et al 2010).…”