Abstract

A new specimen of a therizinosauroid dinosaur recovered from the Lower Cretaceous Xinminpu Group in the Yujingzi Basin of the Jiuquan area, Gansu Province, northwestern China, consists of a partial postcranial skeleton, including a well-preserved left half of the pelvic girdle. It is referred to Suzhousaurus megatherioides Li et al., 2007 based on the autapomorphic anterior concavity of its pubic shaft and is the second known specimen of this taxon. Comparisons of the structure of therizinosauroid pelvic girdles show that the pelvis of Suzhousaurus possesses several unique features, including a laterally deflected, thin, and flat preacetabular process of the ilium, a smoothly curved anterodorsal margin of the preacetabular process of the ilium, and a concave anterior margin of the pubic shaft. Cladistic analysis confirms that Suzhousaurus is more derived than the Early Cretaceous therizinosauroids Falcarius and Beipiaosaurus, less derived than Late Cretaceous forms, and likely closely related to Alxasaurus from the Early Cretaceous of Inner Mongolia, China.

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