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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.
Physical features. 1  The Plesiosaurus was medium sized reptile. It could achieve an adult length of about 10 to 12 feet. 2  The head of the Plesiosaurus was very small as compared to the rest of its body. 3  Its neck was very long and slender. A small head was a necessity for the Plesiosaurus since it neck was delicate.