Spheroolithidae

Spheroolithidae; Temporal range:Early–Late Cretaceous; ~136–66Ma PreꞒ Ꞓ O S D C P T J K Pg N
	Spheroolithuseggs from China
Egg fossil classification
Basic shell type:	†Dinosauroid-spherulitic
Oofamily:	†Spheroolithidae
Oogenera
	†Guegoolithus; †Spheroolithus; †Paraspheroolithus

Spheroolithidaeis anoofamilyofdinosaur eggs.It containsGuegoolithus,Spheroolithus,andParaspheroolithus.^[1]Like modernbirds,the eggshell membrane formed before thecalcareouspart of the shell.^[2]

References

^Moreno-Azanza, M.; Canudo, J.I.; Gasca, J.M. (2014)."Spheroolithid eggshells in the Lower Cretaceous of Europe. Implications for eggshell evolution in ornithischian dinosaurs"(PDF).Cretaceous Research.51:75–87.doi:10.1016/j.cretres.2014.05.017.
^Z.-K. Zhao. (1994) "Dinosaur eggs in China:On the structure and evolution of eggshells." In K. Carpenter, K. F. Hirsch, and J. R. Horner (eds.),Dinosaur Eggs and Babies,Cambridge University Press, Cambridge. Cambridge. pp. 184–203.

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Spheroolithidae Temporal range:Early–Late Cretaceous ~136–66Ma PreꞒ Ꞓ O S D C P T J K Pg N

Spheroolithuseggs from China
Egg fossil classification
Basic shell type:	†Dinosauroid-spherulitic
Oofamily:	†Spheroolithidae
Oogenera
†Guegoolithus †Spheroolithus †Paraspheroolithus