The authors placed " Eosipterus " in a general Pterodactyloidea " incertae sedis "; in 1999 a placement within Pterodactylidae was suggested and even a synonymy with " Pterodactylus " within a hypothesis that the lower Yixian Formation dated from the late Jurassic.
22.
Although phylogenetic analyses that based on David Unwin's 2003 analysis do not recover monophyletic Archaeopterodactyloidea, phylogenetic analyses that based on Kellner's analyses, or the analyses of Brian Andres ( 2008, 2010, in press ) recover monophyletic Archaeopterodactyloidea at the base of the Pterodactyloidea.
