†Plagioolithus fukuiensis Imai and Azuma, 2015 (type)
Plagioolithus is an oogenus of fossil egg. It is from the Early Cretaceous of Japan. It was probably laid by a bird, making it the oldest known fossil bird egg.[1]
^Imai, Takuya; Azuma, Yoichi (2015). "The oldest known avian eggshells, Plagioolithus fukuiensis, from the Lower Cretaceous (upper Barremian) Kitadani Formation, Fukui, Japan". Historical Biology. 27 (8): 1090–1097. Bibcode:2015HBio...27.1090I. doi:10.1080/08912963.2014.934232. S2CID 129113738.
external surface suggests that Plagioolithus belongs to a bird (though to what type of bird remains unknown). Plagioolithus is only known from a single formation...
Imai, Takuya; Azuma, Yoichi (2015). "The oldest known avian eggshells, Plagioolithus fukuiensis, from the Lower Cretaceous (upper Barremian) Kitadani Formation...
archipelago. For extant birds from the area, see List of birds of Japan. Plagioolithus fukuiensis Wikimedia Commons has media related to Fossils of Japan....
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