Genus: Mei XU & NORELL, 2004
Etymology: Chinese, mei, meaning to sleep soundly.

Species: long XU & NORELL, 2004
Etymology: Chinese, long, 'dragon'; Sleeping dragon.

Holotype: IVPP V12733

Locality: Lujiatun, Shangyuan, Beipiao City, western Liaoning Province, China.

Horizon: Horizon 1, Lower part of the Yixian Formation, Jehol Group.

Biostratigraphy: Psittacosaurus Fauna, Confuciusornis Avifauna.

Age: Valanginian Stage, Upper Neocomian Subepoch, Early Early Cretaceous Epoch, Early Cretaceous.

Material: Nearly complete specimen.
Note: Has a furcula.

Note: Has its head burried below an arm, and body curled up, similar to modern birds sleeping.