Protopteryx

Source: Wikipedia, the free encyclopedia.

Protopteryx
Temporal range:
Ma
↓
Fossil specimen, National Museum of Natural Science
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Clade: Saurischia
Clade: Theropoda
Clade: Avialae
Clade: †Enantiornithes
Order: †Protopterygiformes
Zhou
, 2006
Family: †Protopterygidae
Zhang & Zhou, 2006
Genus: †Protopteryx
Zhang & Zhou, 2000
Species:
†P. fengningensis
Binomial name
†Protopteryx fengningensis
Zhang & Zhou, 2000

Protopteryx is an

barbs and rami.[7]

Description

Protopteryx fossils show that they were roughly the same as a today's

flight feathers, and long, ribbon-like tail feathers. The body was mostly covered in feathers of about 12 millimetres (0.47 in). The barbs of the down feathers were laminar instead of hairlike and were frayed at the tips. The most distinctive feature of Protopteryx is that the tail consisted of two long feathers which only had barbs at their tips. Closer to the body, the long tail feathers were thin and needle-like. The only modern bird to share a feather type similar to Protopteryx is the red bird-of-paradise. The tail feathers also lack rami on the proximal end of the tail.[8]

Classification

Protopteryx is one of the most basal known members of the group Enantiornithes. It appeared after Archaeopteryx, one of the most basal birds, and Confuciusornis.[9] Protopteryx is more basal than the species Eocathayornis[1] and Paraprotopteryx.[10]

Discovery and geography

Protopteryx was discovered in the Sichakou Member of the Hebei province, west of the Liaoning province.[11] The formations where Protopteryx was found were the Yixian and Dageibou formations.[12][13] The Sichakou Basin is part of the Daxinganling-Taihangshan Tectonomagmatic Belt and moves in a north-northeast direction. When Protopteryx was alive, the Sichakou basin was located at the Hongqiangou-Jiecangou.[11]

Paleobiology

Protopteryx lived in the

clades.[14] The teeth of the Protopteryx are similar to Archaeopteryx, suggesting a similar diet.[8]

Feather adaptations

Protopteryx was adapted for flying and had feathers with features similar to modern birds, as shown by its procoracoid, carina of the sternum, external tuberosity of the humerus, and deltoid crest, which suggest Protopteryx had a modern musculus supercoracoideus and pectoralis. Protopteryx also shares asymmetric wing flight feathers with flying birds, as well as Archaeopteryx and Confuciusornis.[8] The tail feathers of Protopteryx lack of barbs and rami close to the body,[8] suggesting a use outside of flight, such as display, thermoregulation, or sensory usage.[9]

See also

References

  1. ^ a b Zhou, Zhonghe. (2002). "A new and primitive enantiornithine bird from the Early Cretaceous of China." Journal of Vertebrate Paleontology, 22(1): 49-57.
  2. PMID 11110660
    .
  3. doi:10.1007/s11434-008-0209-5
    .
  4. doi:10.1080/14772019.2010.512614
  5. ^ Zhiheng Li, Zhonghe Zhou, Min Wang, Julia A. Clarke, (2014). "A New Specimen of Large-Bodied Basal Enantiornithine Bohaiornis from the Early Cretaceous of China and the Inference of Feeding Ecology in Mesozoic Birds." Journal of Paleontology, 88: 99-108.
  6. ^ a b A Primitive Enantiornithine Bird and the Origin of Feathers Fucheng Zhang and Zhonghe Zhou Science 8 December 2000: 290 (5498), 1955-1959. [DOI:10.1126/science.290.5498.1955]
  7. ^ Zhou, Zhonghe, and Fucheng Zhang. "Origin of feathers–perspectives from fossil evidence." Science Progress 84, no. 2 (2001): 87-104.
  8. ^ a b c d "A Primitive Enantiornithine Bird and the Origin of Feathers", Fucheng Zhang and Zhonghe Zhou". Science 8 December 2000: 290 (5498), 1955-1959. [DOI:10.1126/science.290.5498.1955]
  9. ^ a b Fucheng, Z., Zhonghe, Z. and Dyke, G. (2006), Feathers and ‘feather-like’ integumentary structures in Liaoning birds and dinosaurs. Geol. J., 41: 395–404. doi: 10.1002/gj.1057
  10. ^ Xiaoting, Z., Zihui, Z. and Lianhai, H. (2007), A New Enantiornitine Bird with Four Long Rectrices from the Early Cretaceous of Northern Hebei, China. Acta Geologica Sinica, 81: 703–708. doi: 10.1111/j.1755-6724.2007.tb00995.x
  11. ^ a b Jin, F.; Zhang, F.C.; Li, Z.H.; Zhang, J.Y.; Li, C.; Zhou, Z.H. (2008). "On the horizon of Protopteryx and the early vertebrate fossil assemblages of the Jehol Biota". Chinese Science Bulletin 53 (18): 2820–2827. doi:10.1007/s11434-008-0209-5.
  12. ^ Zhonghe, Z. (2006), "Evolutionary radiation of the Jehol Biota: chronological and ecological perspectives". Geol. J., 41: 377–393. doi: 10.1002/gj.1045
  13. ^ O’Connor, Jingmai K., Zhonghe Zhou, and Fucheng Zhang. "A reappraisal of Boluochia zhengi (Aves: Enantiornithes) and a discussion of intraclade diversity in the Jehol avifauna, China." Journal of Systematic Palaeontology 9, no. 1 (2011): 51-63.
  14. ^ He, H. Y., X. L. Wang, F. Jin, Z. H. Zhou, F. Wang, L. K. Yang, X. Ding, A. Boven, and R. X. Zhu (2006), "The 40Ar/39Ar dating of the early Jehol Biota from Fengning, Hebei Province, northern China", Geochem. Geophys. Geosyst., 7, Q04001, doi:10.1029/2005GC001083.

Sources

External links

Retrieved from "https://en.wikipedia.org/w/index.php?title=Protopteryx&oldid=1219890558"