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Dinosaur eggs found from the Upper Cretaceous Goseong Formation of Tongyeong City, southern coast of Korea are herein described as Macroelongatoolithus goseongensis oosp. nov. and Dictyoolithus neixiangensis. M. goseongensis is large (39 ㎝ in length), elongate egg. Elongation index is 3.4 and shell ...

Dinosaur eggs found from the Upper Cretaceous Goseong Formation of Tongyeong City, southern coast of Korea are herein described as Macroelongatoolithus goseongensis oosp. nov. and Dictyoolithus neixiangensis. M. goseongensis is large (39 ㎝ in length), elongate egg. Elongation index is 3.4 and shell thickness is 2.3-3.1 ㎜. Continuous layer to mammillary layer ratio ranges up to 4.8 : 1. M. goseongensis differs from M. carlylei in continuous to mammillary layer ratio, from M. zhangi in egg size, elongation index, and continuous to mammillary layer ratio, and from M. xixiaensis in elongation index and continuous to ma㎜illary layer ratio. D. neixiangensis is a spherical egg with a diameter of 120 ㎜. Shell thickness is 1.5-1.7 ㎜. Outer surface of egg is smooth with grainy forms. It is characterized by basic microstructure of eggshell which displays irregular reticulate composed of two or three superimposed eggshell units. M. goseongensis represents fourth oospecies of Macroelongatoolithus and provides an evidence for extending paleobiogeographic distribution of this oogenus. Occurrence of M. goseongensis also suggests oviraptosaur or oviraptorosaur-like theropod, possible maker of M. goseongensis, lived on the Gyeongsang Basin of Korea during the Cretaceous. Occurrence of Dictyoolithus neixiangenesis from the Upper Cretaceous (Campanian) Goseong Formation represents the first record of Dictyoolithus outside of type locality, Henan, southeast of China and provides an evidence for widening its stratigraphic range from Early Cretaceous to Late Cretaceous and its paleogeographic distribution from southeast China to Korea.

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