Genus
Formal taxon Extinct

Undulatoolithus

Wang et al. 2013

Undulatoolithus is an oogenus of Late Cretaceous fossil dinosaur egg classified in Elongatoolithidae, known from China and Utah. It is very similar to Macroolithus, but has different ornamentation. Like other elongatoolithids, it was probably laid by oviraptorosaurs.

Temporal range
Triassic
Jurassic
Cretaceous
Paleogene
Neogene
252 201 145 66 0 Ma
PBDB occurrences
2
Group
Dinosaures
Carnivore Ground dwelling, solitary Terrestrial
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PBDB ↗ Wikipedia ↗
Classification
Dinosauria Unranked clade
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Theropoda Unranked clade
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Elongatoolithidae Family
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Undulatoolithus Genus
Fossil sites 2 geolocated sites
Distribution
Top countries
🇨🇳 China
1
🇺🇸 United States
1
Geological formations
Zhoutian
1
Cedar Mountain
1
Temporal distribution
Campanian (83.6–72.2 Ma)
1
Cenomanian (100.5–93.9 Ma)
1
Species (1)
Undulatoolithus pengi 101 Ma
Bibliography
Original description
Q. Wang, Z. Zhao, and X. Wang, N. Li, S. Zou. 2013. A new form of Elongatoolithidae, Undulatoolithus pengi oogen. et oosp. nov. from Pingxiang, Jiangxi, China. Zootaxa 3746(1):194-200 DOI ↗
Bibliography (2)
J. Hedge, R. T. Tucker, and P. J. Makovicky, L. E. Zanno. 2025. Fossil eggshell diversity of the Mussentuchit Member, Cedar Mountain Formation, Utah. PLOS ONE 20(2):e0314689:1-33 DOI ↗
Q. Wang, Z. Zhao, and X. Wang, N. Li, S. Zou. 2013. A new form of Elongatoolithidae, Undulatoolithus pengi oogen. et oosp. nov. from Pingxiang, Jiangxi, China. Zootaxa 3746(1):194-200 DOI ↗