Anchiornis
A small, four-winged dinosaur key to understanding bird evolution.
Anchiornis is a genus of small, four-winged paravian dinosaurs from the Late Jurassic, known from hundreds of fossils found only in the Tiaojishan Formation of Liaoning, China. The only known species is *Anchiornis huxleyi*, named for its similarity to modern birds and in honor of Thomas Henry Huxley. It became the first Mesozoic dinosaur species for which almost the entire life appearance could be determined, providing important information on the early evolution of birds.
The first fossil, a partial skeleton missing the skull and part of the tail, was discovered in the Yaolugou area of Jianchang County and described by paleontologist Xu Xing in 2009. A second, more complete specimen from the nearby Daxishan area preserved long wing feathers on the arms, legs, and feet, confirming it was a four-winged dinosaur similar to *Microraptor*. Hundreds of additional specimens have since been identified, including a nearly complete skeleton with a feathered head crest used to reconstruct the animal’s life coloration, and another that allowed a scanning electron microscope study of feather microstructure and melanosome color. The Shandong Tianyu Museum holds over 250 specimens.
*Anchiornis* was a crow-sized, bipedal theropod with a triangular skull, long arms, legs, and tail. Its body was covered in two types of downy feathers, while the wings, legs, and tail bore long, vaned feathers. Long, simple feathers covered the head, neck, torso, and upper legs, and a crest of long feathers may have adorned the crown. The tail ended in pennaceous feathers.
- scientific_name
- Anchiornis huxleyi
- location
- Tiaojishan Formation, Liaoning, China
- known_for
- First Mesozoic dinosaur with nearly complete life appearance determined; four-winged dinosaur similar to Microraptor
Quick Facts
- Taxon
- Anchiornis huxleyi
Facts from the source article.
Lore & Background
Anchiornis huxleyi was a small, crow-sized, bipedal theropod dinosaur with a triangular skull sharing features with dromaeosaurids, troodontids, and early birds. Its long arms, legs, and tail supported narrow, vaned feathers, while the rest of its body was covered in two types of simpler, downy feathers: one made of filaments attached at their bases, and a more complex type with barbs along a central quill. Long, simple feathers covered the head, neck, torso, upper legs, and the first half of the tail, with the remainder of the tail bearing pennaceous tail feathers. A crest of long feathers may have adorned the head. The type specimen, IVPP V14378, is an articulated skeleton lacking the skull, part of the tail, and right forelimb. The generic name Anchiornis derives from Greek for "near bird," reflecting its role in bridging the gap between dinosaur and bird body plans. Hundreds of specimens have been found exclusively in the Tiaojishan Formation of Liaoning, China, dated to the Late Jurassic, about 160 million years ago. Exquisite preservation in some fossils made Anchiornis the first Mesozoic dinosaur for which nearly the entire life appearance could be determined, providing crucial insights into early bird evolution.
Reader's Guide
Anchiornis is significant because it provides a nearly complete picture of the anatomy and life appearance of a Mesozoic dinosaur, including feather structure, coloration, and soft tissues. Studies using laser fluorescence have revealed details of feathers, skin, and muscle tissue. Its four-winged body plan, with long feathers on both arms and legs, resembles that of Microraptor and supports the idea that early paravians used multiple surfaces for gliding or display. The discovery of hundreds of specimens, including those with preserved melanosomes, allowed scientists to determine the animal's life coloration, though some specimens show different color patterns, and one study noted that a key specimen may not be Anchiornis due to later discoveries of similar species. The multi-layered wing arrangement and 'shaggy' contour feathers suggest that Anchiornis had poor aerodynamic efficiency, influencing ideas about the early evolution of flight.
Did You Know?
- Anchiornis was the first Mesozoic dinosaur species for which almost the entire life appearance could be determined.
- The name Anchiornis huxleyi honors Thomas Henry Huxley, an early proponent of biological evolution and a close relationship between birds and dinosaurs.
Frequently Asked Questions
What is Anchiornis?
Anchiornis was a tiny, four-winged paravian dinosaur from the Late Jurassic. It had feathered wings on both its arms and its legs, giving it a body plan often compared to that of Microraptor.
Where were Anchiornis fossils found?
Every known specimen comes from the Tiaojishan Formation in Liaoning province, China. Hundreds of individuals have been recovered from that single geological site, making it one of the best-documented small dinosaurs of its era.
Why is Anchiornis considered a landmark discovery?
It was the first Mesozoic dinosaur for which nearly the entire life appearance—feather arrangement, coloration, and body proportions—could be reconstructed in detail. That level of completeness gave paleontologists an unprecedented window into what early bird-like dinosaurs actually looked like.
Who was Anchiornis huxleyi named after?
The species epithet honors the British biologist Thomas Henry Huxley, a prominent 19th-century naturalist. The genus name itself highlights the dinosaur's close structural resemblance to modern birds.
How does Anchiornis help us understand bird evolution?
Its preserved feathers and four-winged anatomy provided concrete evidence of intermediate stages between non-avian dinosaurs and today's birds. By showing how wing and feather structures were arranged in a small paravian, it helped scientists trace key steps in the origin of avian flight.
More in Prehistoric Extinct Animals 1-24
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