What is Archaeopteryx lithographica?

Archaeopteryx lithographica is an extinct genus of bird-like dinosaurs that lived around 150 million years ago during the Late Jurassic period in southern Germany. Historically celebrated as the earliest known bird and a vital transitional fossil supporting Charles Darwin's theory of evolution, it exhibits a mosaic of features shared with both reptiles and modern birds. Fourteen body fossils have been recovered from Solnhofen limestone deposits, showing advanced flight feathers alongside dinosaurian traits like sharp teeth and a long bony tail.

What we know

• Archaeopteryx lived in the Late Jurassic around 150 million years ago in southern Germany, which was then an archipelago of islands in a shallow warm tropical sea. [2, 4]
• Despite having broad wings and advanced flight feathers, Archaeopteryx shared key skeletal features with small Mesozoic theropods like dromaeosaurids and troodontids, including sharp teeth, a long bony tail, and claws. [2]
• Fourteen body fossils and one disputed initial feather specimen have been discovered, primarily in the lithographic limestone quarries near Solnhofen, Germany. [2, 3]
• The discovery of Archaeopteryx closely followed the publication of Charles Darwin's On the Origin of Species, serving as a primary transitional fossil confirmation for evolution. [2]

Still open

• It remains debated whether all discovered specimens belong to a single species or genus, and whether Archaeopteryx was strictly an avialan or potentially a deinonychosaur.
• The exact identity and ownership of the single feather discovered in 1861, which initiated the naming of the genus, has been a subject of controversy.

Where to go next

• whereWhat are the Solnhofen limestone fossils?
• how it workedHow did feathers evolve in dinosaurs?
• the bigger pictureHow does Avialae relate to modern birds?
• compared withWhat other feathered dinosaurs come from China?
• how we knowHow did Charles Darwin react to transitional fossils?
• an unexpected connectionHow do modern crocodiles share a history with birds?According to current biological consensus, birds and modern crocodiles are the sole surviving members of the reptile clade Archosauria.

Sources

• [1]Archaeopteryx (Wikidata Q100196) · CC0 1.0
• [2]Archaeopteryx · CC BY-SA 4.0
• [3]Specimens of Archaeopteryx · CC BY-SA 4.0
• [4]Avialae · CC BY-SA 4.0
• [5]Evolution of birds · CC BY-SA 4.0