Pedopenna
A feathered dinosaur with hind wings from Jurassic China.
Pedopenna, whose name means "foot feather," is a genus of small, feathered dinosaur belonging to the maniraptoran group, discovered in China's Daohugou Beds. Its age relative to Archaeopteryx is uncertain because the dating of those beds is disputed, though most researchers place them between the late Middle Jurassic and early Late Jurassic. The species name, *Pedopenna daohugouensis*, comes from the long, pennaceous feathers on its foot bones and the fossil's location at Daohugou. Since only the hind legs have been found, its full length is hard to gauge, but it likely measured one meter or less.
The feet of Pedopenna were similar to those of troodontids and dromaeosaurids, but more primitive. Its second toe had an enlarged claw and was slightly shortened, but not as specialized as the sickle-claws of its deinonychosaur relatives. The scientists who described it, Xu Xing and Zhang Fucheng, argued that the presence of such a primitive member of the avian lineage in the Daohugou Beds, alongside other primitive relatives, supports the idea that Avialae originated in Asia.
Pedopenna is notable for its long, pennaceous feathers on the metatarsus—a feature also seen in some deinonychosaurs like *Microraptor*, but with key differences. Its hind wings were smaller and more rounded, with the longest feathers reaching about 55 millimeters, slightly shorter than the foot bones. Unlike the asymmetrical feathers of some deinonychosaurs and birds—which are typical for flight—Pedopenna's foot feathers were symmetrical. This suggests it represents an early stage in feather evolution, before strong aerodynamic adaptations. The feather impressions are faint but show a central shaft and barbs, and the foot feathers appear more numerous than those of *Microraptor*. There is also evidence of shorter, overlying feathers similar to the coverts of modern birds. Because these feathers were less stiff and showed fewer aerodynamic features than those of *Microraptor*, any flight function would have been weak. Xu and Zhang proposed that the feathers might have been ornamental or even vestigial, possibly representing a reduced hind wing from an ancestor that used it for gliding. This idea gained support from the 2017 discovery of *Serikornis*, another anchiornithid with similar soft, symmetrical feathers. Recent studies have classified Pedopenna as a scansoriopterygid or, more recent
- field
- Paleontology
- known_for
- Long pennaceous feathers on the metatarsus (hind wings)
- time_period
- Late Middle Jurassic to early Late Jurassic (168–152 million years ago)
- location
- Daohugou Beds, China
- classification
- Maniraptoran dinosaur, possibly paravian, avialan, scansoriopterygid, or anchiornithid
Quick Facts
- Genus
- Pedopenna
- Species
- daohugouensis
Facts from the source article.
Lore & Background
Pedopenna is known only from hind legs, so its actual length is difficult to estimate, but it probably measured 1 meter (3 ft) or less in length. The feet resembled those of related troodontids and dromaeosaurids, though were overall more primitive. The second toe had an enlarged claw and was slightly shortened, but not as highly developed as the sickle-like claws of deinonychosaurs. Xu Xing and Zhang Fucheng, who interpreted the Daohugou fossil beds as mid to late Jurassic in age, used the presence of such a primitive member of the avian lineage to support the idea that Avialae originated in Asia.
Reader's Guide
Pedopenna is significant for its role in understanding the evolution of feathers and flight in dinosaurs. Its symmetrical, less aerodynamic hind wings suggest an intermediate stage between a functional gliding apparatus and a display or insulatory function. Xu and Zhang suggested the feathers could be ornamental or even vestigial. The discovery of Serikornis in 2017, an anchiornithid with similar soft, symmetrical feathers, corroborated the theory that hind wings were present in ancestors of deinonychosaurs and birds and later reduced in the bird lineage. Pedopenna's classification has shifted over time—originally considered a paravian, then a true avialan, later a scansoriopterygid, and most recently an anchiornithid—reflecting ongoing debate about its evolutionary relationships. Its presence in the Daohugou Beds, alongside other primitive members of related lineages, supports the hypothesis that Avialae originated in Asia.
Did You Know?
- Pedopenna means 'foot feather' in reference to the long pennaceous feathers on its metatarsus.
- The longest foot feathers of Pedopenna were about 55 mm (2 in) long.
- Pedopenna had symmetrical feathers, unlike the asymmetrical feathers of some deinonychosaurs and birds.
- The holotype of Pedopenna was found in the Daohugou locality in China.
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