The fossil of Archaeopteryx repre- sents the evidence of origin of—

Archaeopteryx is widely recognized as a transitional fossil that provides critical evidence for the evolution of birds from reptiles (specifically theropod dinosaurs). Discovered in 1861 in Jurassic-era limestone, this specimen exhibits a mosaic of features: avian traits such as feathered wings and a wishbone, alongside reptilian characteristics like sharp teeth, a long bony tail, and claws on its wings [1]. While it is often referred to as the 'Urvogel' or 'first bird,' it represents a link between non-avian dinosaurs and modern birds [1]. Its discovery shortly after the publication of Darwin's theory of evolution served as a pivotal piece of evidence for natural selection and the descent of birds from reptilian ancestors. Although newer discoveries like Anchiornis have been found, Archaeopteryx remains the classic example of the transition from reptiles to birds [1].

Sources

1. [1] https://www.nhm.ac.uk/discover/dino-directory/archaeopteryx.html