Oogenus: Undulatoolithus WANG, ZHAO, WANG, LI & ZOU, 2013
Etymology: Latin, undulatus, "wavy," Greek, oo, "egg" and Greek, lithus, "rock or stone."

Oospecies: pengi WANG, ZHAO, WANG, LI & ZOU, 2013
Etymology: In honor of the late Peng Anbao, chief curator of the Pingxian Museum, who collected and portected the dinosaur eggs from the Pingxian Basin.

Holotype: PXMV-0016

Locality: Chingxi, Pingxiang City, Jiangxi Province, China.

Horizon: Zhoutian Formation.

Biostratigraphy:

Age: Late Cretaceous.

Material: A clutch wiht 5 more or less well preserved eggs adn 3 broken eggs.

Referred material:

HEDGE, TUCKER, MAKOVICKY & ZANNO, 2025

Locality: Emery County, Utah.

Horizon: Mussentuchit Member, Cedar Mountian Formation.

Biostratigraphy:

Age: Cenomanian Stage, Middle Gallic Subepoch, Early Gulf Epoch, Middle Cretaceous.

Material:

NCSM 33729 (n- 1): Eggshell.

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