Genus: Xixianykus XU, WANG, SULLIVAN, HONE, HAN, YAN & DU, 2010
Etymology: Generic name from Xixia (area of orign), Henan Province, China and Greek, onyx, "claw."

Species: zhangi XU, WANG, SULLIVAN, HONE, HAN, YAN & DU, 2010
Etymology: In honor of Prof. Zhang Wentang, who has contributed greatly to the study of paleontology in Henan Province.

Holotype: XMDFEC V0011

Locality: Zhoujiagou, Yangcheng, Xixia County, Henan Province, China.

Horizon: Majiacun Formation.

Biostratigraphy:

Age: Coniacian-Santonian Stage, Senonian Subepoch, Gulf Epoch, Late Cretaceous.

Material: 5 posterior dorsal vertebrae, a complete synascrum, 2 anterior caudal vertebrae, a few dorsal ribs, gastralia, both ilia, right pubis, right ischium, and most of right hind limb.