Hadrosauroid eggs and embryos from the Upper cretaceous (Maastrichtian) of Jiangxi Province, China
BMC Ecology and Evolution, 2022•Springer
Background Dinosaur eggs containing embryos are rare, limiting our understanding of
dinosaur development. Recently, a clutch of subspherical dinosaur eggs was discovered
while blasting for a construction project in the Upper Cretaceous red beds (Hekou
Formation) of the Ganzhou Basin, Jiangxi Province, China. At least two of the eggs contain
identifiable hadrosauroid embryos, described here for the first time. Results The eggs,
attributable to Spheroolithidae indet., are thin-walled and small (~ 660 mL) compared to …
dinosaur development. Recently, a clutch of subspherical dinosaur eggs was discovered
while blasting for a construction project in the Upper Cretaceous red beds (Hekou
Formation) of the Ganzhou Basin, Jiangxi Province, China. At least two of the eggs contain
identifiable hadrosauroid embryos, described here for the first time. Results The eggs,
attributable to Spheroolithidae indet., are thin-walled and small (~ 660 mL) compared to …
Background
Dinosaur eggs containing embryos are rare, limiting our understanding of dinosaur development. Recently, a clutch of subspherical dinosaur eggs was discovered while blasting for a construction project in the Upper Cretaceous red beds (Hekou Formation) of the Ganzhou Basin, Jiangxi Province, China. At least two of the eggs contain identifiable hadrosauroid embryos, described here for the first time.
Results
The eggs, attributable to Spheroolithidae indet., are thin-walled and small (~ 660 mL) compared to those of Lambeosaurinae. The shape of the embryonic squamosal is reminiscent of that seen in the Late Cretaceous hadrosauroids Levnesovia transoxiana, Tanius sinensis, and Nanningosaurus dashiensis, suggestive of possible affinities.
Conclusion
The small size of the eggs and embryos, similar to those of Hadrosaurinae, indicates that the larger eggs and hatchlings typical of Lambeosaurinae are evolutionarily derived.
Springer
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