在20世纪30年代,一个目录号为GM4362的几乎完整的化石可能是由Lambrecht归属于古鸨属。Houde和Haubold在德国哈勒马丁路德大学Geiseltalmuseum的收藏中发现了另外三个标本。其中一个是古鸨属的正模标本(=Ornithonemus geiseltalensis,Lambrecht 1935)。Houde和Haubold还请求允许在德国达姆施塔特的Hesseches Landesmuseum提供一个名为HLMD Me 7530的化石。HLMD Me 7530是从著名的梅塞尔页岩中采集的。当它被准备好的时候,两位鸟类学家也把它归类为古鸨属。
^ Lambrecht, K. (1928) Palaeotis weigelti n. g. sp., eine fossil trappe aus der mitteleozanen Braunkohle des Geiseltales. Jahrbuch hallesch. Verband., Halle, n.s., 7:11.
^Buffetaut, E.; Angst, D. (November 2014). "Stratigraphic distribution of large flightless birds in the Palaeogene of Europe and its palaeobiological and palaeogeographical implications". Earth-Science Reviews. 138: 394–408. doi:10.1016/j.earscirev.2014.07.001.
^Agnolin et al, Unexpected diversity of ratites (Aves, Palaeognathae) in the early Cenozoic of South America: palaeobiogeographical implications
Article in Alcheringa An Australasian Journal of Palaeontology · July 2016
DOI: 10.1080/03115518.2016.1184898
^Peter Houde and Hartmut Haulbold, Palaeotis weigelti restudied: a small Middle Eaocene ostrich (Aves: sTRUTHIONIFORMES)