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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.
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.3  Some archosaurs, such as birds, are secondarily toothless.ike the early tetrapods, early archosaurs had a sprawling gait because their hip sockets faced sideways, and the knobs at the tops of their femurs were in line with the femur. In the early to mid Triassic, some archosaur groups developed hip joints which allowed (or required) a more erect gait.