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Binomial Name. Archaeopteryx lithographica. Archaeopteryx is an extinct bird that evolutionists argue possesses some reptilian-like features causing it to be classified as a evolutionary transitional form, and is considered the first of the so called feathered dinosaurs.inomial Name. Archaeopteryx lithographica. Archaeopteryx is an extinct bird that evolutionists argue possesses some reptilian-like features causing it to be classified as a evolutionary transitional form, and is considered the first of the so called feathered dinosaurs.
The simplest and most widely-agreed synapomorphies of archosaurs are: 1  Teeth set in sockets, which makes them less likely to be torn loose during feeding. 2  This feature is responsible for the name  thecodonts  (socket teeth), which paleontologists used to apply to all or most archosaurs. The hip sockets faced sideways but the knobs on the femurs were at right angles to the rest of the femur, which therefore pointed downwards. 2  Dinosaurs evolved from archosaurs with this hip arrangement. 3  The hip sockets faced downwards and the knobs on the femurs were in line with the femur.