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Parvoolithus : ウィキペディア英語版 | Parvoolithus
''Parvoolithus'' is an oogenus of Mongolian fossil egg. They are known from a single small, smooth egg, which cannot be assigned to any known oofamily.〔Mikhailov, K.E. (1997). Fossil and recent eggshell in amniotic vertebrates: Fine structure, comparative morphology and classification. ''Special Papers in Palaeontology'' 56. The Palaeontological Association. London. (page 58).〕 It is very similar to the eggs of modern birds in many aspects; in fact, a cladistic analysis by Zelenitsky and Therrien found it to be a sister taxon to the guinea fowl (genus ''Numida''), indicating that they represent the eggs of birds, rather than a non-avialan theropod.〔Zelenitsky, D.K. and Therrien, F. (2008). Phylogenetic analysis of reproductive traits of maniraptoran theropods and its implications for egg parataxonomy. ''Palaeontology'', 51(4): 807–816〕 ==References==
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