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Protoceratopsidovum
''Protoceratopsidovum'' is an oogenus of dinosaur egg from Mongolia.〔Carpenter, K. 1999. Eggs, Nests, and Baby Dinosaurs: A Look at Dinosaur Reproduction (Life of the Past). Indiana University Press, Bloomington, Indiana.〕 Despite its name, it does not represent the eggs of ''Protoceratops'', but rather the eggs of Maniraptoran Theropods.〔Zelenitsky, D. K. And Therrien, F. (2008), "(Phylogenetic Analysis Of Reproductive Traits Of Maniraptoran Theropods And Its Implications For Egg Parataxonomy )." ''Palaeontology'', 51: 807–816. Doi: 10.1111/J.1475-4983.2008.00770.X〕
==Description==
''Protoceratopsidovum'' eggs are extremely abundant in the Djadokhta and Barun Goyot Formations.〔Mikhailov, K.E. (2000). "Eggs and eggshells of dinosaurs and birds from the Cretaceous of Mongolia." ''The age of dinosaurs in Russia and Mongolia.'' Cambridge University Press, Cambridge. pp. 560-572.〕 ''P. sincerum'' and ''P. minimum'' both have a smooth surface, whereas ''P. fluxuosum'' has fine ornamentation around the equatorial part of the egg.〔 The eggs are elongated and asymmetrical, with a two-layered prismatic shell generally resembling the eggs of ''Troodon''.〔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. C''retaceous Research'', 51, 75-87.〕 They are laid in pairs.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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