Spheroolithus

Spheroolithus Temporal range: Late Cretaceous ~99.6–66 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Spheroolithus eggs from China
Egg fossil classification
Basic shell type:	†Dinosauroid-spherulitic
Oofamily:	†Spheroolithidae
Oogenus:	†Spheroolithus Zhao, 1979
Synonyms
Paraspheroolithus Zhao, 1979

Spheroolithus is an oogenus of dinosaur egg.^[1]

Oospecies

The following species are described:^[2]

• Paraspheroolithus sanwangbacunensis
• Paraspheroolithus yangchengensis
• Spheroolithus albertensis
• Spheroolithus choteauensis
• Spheroolithus europaeus
• Spheroolithus irenensis
• Spheroolithus jincunensis
• Spheroolithus maiasauroides
• Spheroolithus megadermus
• Spheroolithus spheroides
• Spheroolithus tenuicorticus

Distribution

Fossils of the oogenus were found in:^[2]

• Dinosaur Park and Oldman Formations, Alberta, Canada
• China
• Sasayama Group, Japan
• Cerro del Pueblo Formation (Difunta Group), Mexico
• Nemegt & Bayan Shireh Formations, Mongolia
• La Posa Formation (Tremp Group), Spain
• Two Medicine Formation, Montana and North Horn Formation, Utah, United States
• Lameta Formation, India

Gallery

• 
  Spheroolithus sp. eggs
• 
  Paraspheroolithus eggs in Henan Geological Museum

See also

• List of dinosaur oogenera

References

1. Wang Q, Wang X L, Zhao Z K, and Jiang Y G. (2012). "A new oofamily of dinosaur egg from the Upper Cretaceous of Tiantai Basin, Zhejiang Province, and its mechanism of eggshell formation" Chinese Science Bulletin. 57: 3740-3747. doi: 10.1007/s11434-012-5353-2
2. Spheroolithus in the Paleobiology Database

Bibliography

• Carpenter, K. 1999. Eggs, Nests, and Baby Dinosaurs: A Look at Dinosaur Reproduction (Life of the Past). Indiana University Press, Bloomington, Indiana
• Z. Zhao. 1979. [Advances in the study of fossil dinosaur eggs in our country]. Mesozoic and Cenozoic red beds of South China; selected papers from the field conference on the South China Cretaceous-Early Tertiary red beds. Science Press, Beijing 330-340