Editing Archaeopteryx (section)

=== Species ===
[[File:Archaeopteryx skeletals.jpg|thumb|upright=2|Skeletal restorations of various specimens]]
It has been argued that all the specimens belong to the same species, ''A. lithographica''.<ref name=New_Scientist_1/> Differences do exist among the specimens, and while some researchers regard these as due to the different ages of the specimens, some may be related to actual species diversity. In particular, the Munich, Eichstätt, Solnhofen, and Thermopolis specimens differ from the London, Berlin, and Haarlem specimens in being smaller or much larger, having different finger proportions, having more slender snouts lined with forward-pointing teeth, and the possible presence of a [[sternum]]. Due to these differences, most individual specimens have been given their own species name at one point or another. The Berlin specimen has been designated as ''Archaeornis siemensii'', the Eichstätt specimen as ''Jurapteryx recurva'', the Munich specimen as ''Archaeopteryx bavarica'', and the Solnhofen specimen as ''Wellnhoferia grandis''.<ref name=Elzanowski2002/>

In 2007, a review of all well-preserved specimens including the then-newly discovered Thermopolis specimen concluded that two distinct species of ''Archaeopteryx'' could be supported: ''A. lithographica'' (consisting of at least the London and Solnhofen specimens), and ''A. siemensii'' (consisting of at least the Berlin, Munich, and Thermopolis specimens). The two species are distinguished primarily by large flexor [[Tubercle (bone)|tubercles]] on the foot claws in ''A. lithographica'' (the claws of ''A. siemensii'' specimens being relatively simple and straight). ''A. lithographica'' also had a constricted portion of the crown in some teeth and a stouter metatarsus. A supposed additional species, ''Wellnhoferia grandis'' (based on the Solnhofen specimen), seems to be indistinguishable from ''A. lithographica'' except in its larger size.<ref name=10th_find/>