Heishanoolithus

Heishanoolithus; Temporal range: Early Cretaceous PreꞒ Ꞓ O S D C P T J K Pg N
Egg fossil classification
Basic shell type:	Ornithoid
Morphotype:	Ornithoid-ratite
Oofamily:	†Elongatoolithidae
Oogenus:	†Heishanoolithus; Zhao and Zhao, 1999
Oospecies
	†H. changii Zhao and Zhao 1999 (type);

Heishanoolithus is an oogenus of Elongatoolithid fossil egg from the Shahai Formation in Liaoning. It is known only from seven eggshell fragments. It is most notable for having a very thin eggshell (1.2-1.3 mm thick), the dense covering of nodes on the eggshell surface, and for its relatively thin mammilary layer (making up only one eighth of the eggshell thickness).^[1] While no remains of Heishanoolithus have been associated with skeletal remains, strong evidence links Elongatoolithid eggs to Oviraptorosaurs.^[2]

References

^ Zhao H. and Zhao Z. (1999) "A New Form of Elongatoolithid Dinosaur Eggs from the Lower Cretaceous Shahai Formation of Heishan, Liaoning Province." Vertebrata PalAsiatica, 37(4): 278-284.
^ Simon, D. J. (2014). "Giant Dinosaur (theropod) Eggs of the Oogenus Macroelongatoolithus (Elongatoolithidae) from Southeastern Idaho: Taxonomic, Paleobiogeographic, and Reproductive Implications. Archived 2016-03-04 at the Wayback Machine" (Doctoral dissertation, Montana State University, Bozeman).

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[Zhao_and_Zhao_1999-1] Zhao H. and Zhao Z. (1999) "A New Form of Elongatoolithid Dinosaur Eggs from the Lower Cretaceous Shahai Formation of Heishan, Liaoning Province." Vertebrata PalAsiatica, 37(4): 278-284.

[Simon_2014-2] Simon, D. J. (2014). "Giant Dinosaur (theropod) Eggs of the Oogenus Macroelongatoolithus (Elongatoolithidae) from Southeastern Idaho: Taxonomic, Paleobiogeographic, and Reproductive Implications. Archived 2016-03-04 at the Wayback Machine" (Doctoral dissertation, Montana State University, Bozeman).

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