#Jinzhousaurus yangi

[a-dinosaur-a-day]

Jinzhousaurus yangi

By José Carlos Cortés

Etymology: Reptile from Jinzhou

First Described By: Wang & Xu, 2001

Classification: Dinosauromorpha, Dinosauriformes, Dracohors, Dinosauria, Ornithischia, Genasauria, Neornithischia, Cerapoda, Ornithopoda, Iguanodontia, Dryomorpha, Ankylopollexia, Styracosterna, Hadrosauriformes, Hadrosauroidea

Status: Extinct

Time and Place: Jinzhousaurus lived about 124.4 million years ago, in the Aptian of the Early Cretaceous 

Jinzhousaurus is known from the Dawangzhangzi Beds of the Yixian Formation 

Physical Description: Jinzhousaurus was a Hadrosauroid, a type of dinosaur closely related to the duck-billed dinosaurs (Hadrosaurids) of the late Cretaceous - and a member of the group from which they evolved. This group experimented a lot with how they chewed and acquired food, mainly in order to deal with the rapidly changing environment of the Cretaceous Period. As the late Cretaceous turned into a very humid landscape, however, most of these forms died out, giving way to the Hadrosaurids to take over with their specialized-for-mushy-plant-food mouths. Jinzhousaurus was a fairly medium-sized dinosaur, reaching about 7 meters in length with a skull a half a meter long. It had very large nose holes and a wide back of the skull, with a small crest. It probably would have moved back and forth between walking on two legs versus four. It had three toes on each foot and five fingers on each hand, though only the first three fingers had claws - so it wasn’t really evolving the hoof-like front limbs seen in the Hadrosaurids proper. Its snout wasn’t a duckbill, but more like that of Iguanodon, with a rounded bulky beak - but different enough that it probably had a different feeding strategy than its cousin. Its back was stiffened extensively, making it rigid for balance and the tail mainly inflexible.

Diet: Jinzhousaurus primarily ate plants at the medium-browsing level - so mainly coniferous trees and the like.

Behavior: Jinzhousaurus probably didn’t live in groups but, rather, was mainly solitary. It would have spent most of its time wandering through its environment, grazing on plants alone, and remaining vigilant for danger. It also probably would have taken care of its young, though little else is known about its behavior. 

By Scott Reid

Ecosystem: Jinzhousaurus lived in the Yixian Formation, a highly diverse ecosystem showcasing the variety and evolution of birdie dinosaurs at the beginning of the Cretaceous period. This was a diverse coniferous forest in a temperate, seasonal climate. Very humid, it’s likely that Jinzhousaurus would have seen snow on a regular basis. There were notable dry seasons as well, leading to more tough vegetation for Jinzhousaurus to chew on. There were many flowering plants there too, along with ferns, horsetails, ginkgoes, cycads, seed ferns, and so many others - all good food for Jinzhousaurus. This was also a dense freshwater lake environment, with abundant minerals due to volcanic eruptions - leading to periodic environmental turnover.

Jinzhousaurus lived alongside many other kinds of dinosaurs, as this was an exceptionally diverse community. Here there was the ankylosaurid Liaoningosaurus, another ornithopod called Bolong, and an unnamed titanosaur in terms of other herbivores. There were many kinds of small fluffy dinosaurs - the Compsognathid Sinosauropteryx; the raptors Zhenyuanlong, Changyuraptor, Sinornithosaurus, and Tianyuraptor; the Troodontid Jianianhualong; the protobirds Jeholornis, Confuciusornis, and Zhongornis; the Anchiornithid Yixianosaurus; the Opposite Birds Dalingheornis and Shanweiniao; and the early nearly-true-birds Archaeorhynchus, Eogranivora, Yanornis, Hongshanornis, and Longicrusavis. Non-dinosaurs were of course also present - many types of fish, amphibians, and lizards; mammals such as Akidolestes, Sinobaatar, Sinodelphys, Chaoyangodens, and the famous Eomaia; Choristoderes like Hyphalosaurus and Monjurosuchus; and pterosaurs like Cathayopterus and Ningchengopterus. Essentially, a beautiful snapshot of the Early Cretaceous.

Other: Jinzhousaurus is sort of a mix between earlier ornithopods and the later hadrosaurs, so its classification was difficult to place for a while. But now it seems to be a basal member of the group that lead to the Hadrosaurids, rather than more close to Iguanodon proper.

~ By Meig Dickson

Sources under the Cut 

Amiot, R., X. Wang, Z. Zhou, X. X. Wang, E. Buffetaut, C. Lécuyer, Z. Ding, F. Fluteau, T. Hibino, N. Kusuhashi, J. Mo, V. Suteethorn, Y. Y. Wang, X. Xu, F. Zhang. 2011. Oxygen isotopes of East Asian dinosaurs reveal exceptionally cold Early Cretaceous climates. Proceedings of the National Academy of Sciences 108 (13): 5179 - 5183.

Barrett, P. M., R. J. Butler, W. Xiao-Lin, X. Xing. 2009. Cranial anatomy of the Iguanodontoid Ornithopod Jinzhousaurus yangi from the Lower Cretaceous Yixian Formation of China. Acta Paleontologica Polonica 54(1): 35-48.

McDonald, A. T., D. G. Wolfe, J. I. Kirkland. 2010. A new basal hadrosauroid (Dinosauria: Ornithopoda) from the Turonian of New Mexico. Journal of Vertebrate Paleontology 30(3): 799-812.

Meng, F.X.; Gao, S.; Liu, X.M. (2008). "U-Pb zircon geochronology and geochemistry of volcanic rocks of the Yixian Formation in the Lingyuan area, western Liaoning, China". Geological Bulletin of China. 27: 364–373.

Wang, X., & X. Xu. 2001. A new iguanodontid (Jinzhousaurus yangi gen. et sp. nov.) from the Yixian Formation of western Liaoning, China. Chinese Science Bulletin 46(19): 1669-1672.

Wang, Y., S. Zheng, X. Yang, W. Zhang, Q. Ni. 2006. The biodiversity and palaeoclimate of confier floras from the Early Cretaceous deposits in western Liaoning, northeast China. International Symposium on Cretaceous Major Geological Events and Earth System: 56A.

Zhou, Z. 2006. Evolutionary radiation of the Jehol Biota: chronological and ecological perspectives. Geological Journal 41: 377-393.

[a-dinosaur-a-day]

Changyuraptor yangi

By Scott Reid

Etymology: Long Feathered Robber

First Described By: Han et al., 2014

Classification: Dinosauromorpha, Dinosauriformes, Dracohors, Dinosauria, Saurischia, Eusaurischia, Theropoda, Neotheropoda, Averostra, Tetanurae, Orionides, Avetheropoda, Coelurosauria, Tyrannoraptora, Maniraptoromorpha, Maniraptoriformes, Maniraptora, Pennaraptora, Paraves, Eumaniraptora, Dromaeosauridae, Microraptoria

Status: Extinct

Time and Place: About 124.4 million years ago, in the Aptian of the Early Cretaceous 

Changyuraptor is known from the Dawangzhangzi Bed of the Yixian Formation 

Physical Description: Changyuraptor was a medium sized dinosaur, about 1.2 meters long - something like a modern turkey in terms of weight. It was covered from head to toe in feathers, including full wings on its arms, a large tail fan, and wings on its legs. It had a small, pointy head and long tail, while its body was fairly stocky. It also had sharp claws on its hands and sickle claws on its feet, like other raptor-dinosaurs. It’s tail was so long and feathered - with feathers reaching up to 30 centimeters in length and being the largest feathers known in a non-avian dinosaur - it would have allowed for softer landings for Changyuraptor. In short, it was probably the largest and fluffiest four-winged dinosaur known.

Diet: Changyuraptor would have primarily fed upon small animals like mammals, lizards, and amphibians.

By Emily Willoughby, CC BY-SA 4.0 

Behavior: Like Microraptor, Changyuraptor was probably capable of flight, making it one of the largest flying dinosaurs of the Mesozoic Era - with very few birds ever growing larger than it. It wouldn’t have been a particularly good flier though, only about as well as a chicken, taking off clumsily from the ground to go from area to area. It didn’t have enough strength in the chest and wing muscles to do much more than this, though it’s possible the hindlimb feathers would have allowed for some maneuvering in the air. It then could pounce on its prey, using its sickle claw to hold onto struggling animals before eating them. 

More importantly; the wings, tail fan, and leg wings would have all been good display structures for Changyuraptor, which would have used them to communicate with other members of the species. These feathers would have signaled anger, a desire to mate, or danger, as feathers today are used by birds. It’s probable, then, that at least some fancy coloration may have been present on Changyuraptor to aid in the communication. Changyuraptor would have been a very active animal and most likely would have taken care of its young. In fact, it may have used its variety of wings and fans to help brood the nest.

Ecosystem: Changyuraptor lived in the Yixian Formation, a highly diverse ecosystem showcasing the evolution of birdie dinosaurs - like Changyuraptor - at the beginning of the Cretaceous period. A temperate, seasonal, and humid climate, it was much like the modern day northwestern Pacific Coast, though it would have seen snow on a regular basis, as well as notable dry seasons. It was a diverse coniferous forest, with a variety of flowering plants, ferns, horsetails, ginkgoes, cycads, seed ferns, and many others. Changyuraptor would have probably spent most of its time in the trees as well as on the ground, given its flight ability. There were a lot of freshwater lakes, and abundant volcanic eruptions. 

By Ripley Cook

Changyuraptor lived along so many other kinds of dinosaurs, it’s almost impossible to list them all. There were ankylosaurs like Liaoningosaurus and ornithopods like Bolong and Jinzhousaurus. There was the larger Compsognathid Sinosauropteryx, as well as many raptors in addition to Changyuraptor like the large Zhenyuanlong, Sinornithosaurus, and Tianyuraptor. There was also the Troodontid Jianianhualong, the seed eating protobird Jeholornis, smaller protobirds like Confuciusornis and Zhongornis, and the Anchiornithid Yixianosaurus. Opposite birds were there too like Dalingheornis and Shanweiniao, as well as near-birds like Archaeorhynchus, Eogranivora, Yanornis, Hongshanornis, and Longicrusavis. Non-dinosaurs like fish, amphibians, and lizards were also there; they along with mammals like Akidolestes, Sinobaatar, Sinodelphys, Chaoyangodens, and Eomaia would have been the primary prey of Changyuraptor. There were also Choristoderes like Hyphalosaurus and Monjurosuchus, as well as pterosaurs like Cathayopterus and Ningchengopterus. In short, a fascinating snapshot of Early Cretaceous life.

Other: Changyuraptor was closely related to - and preceded - Microraptor, one of the best known feathered dinosaurs; though we don’t know if it would have been colored like Microraptor, it’s possible it may have also had iridescent feathers like its later relative.

~ By Meig Dickson

Sources under the Cut 

Amiot, R., X. Wang, Z. Zhou, X. X. Wang, E. Buffetaut, C. Lécuyer, Z. Ding, F. Fluteau, T. Hibino, N. Kusuhashi, J. Mo, V. Suteethorn, Y. Y. Wang, X. Xu, F. Zhang. 2011. Oxygen isotopes of East Asian dinosaurs reveal exceptionally cold Early Cretaceous climates. Proceedings of the National Academy of Sciences 108 (13): 5179 - 5183.

Benson, R.B.J. & Brussatte, S. (2012). Prehistoric Life. London: Dorling Kindersley. p. 332.

Choi, Charles (15 July 2014). "Bizarre Dinosaur Had 4 'Wings,' Long Tail Feathers". LiveScience.com. Retrieved 16 July 2014.

Gang Han; Luis M. Chiappe; Shu-An Ji; Michael Habib; Alan H. Turner; Anusuya Chinsamy; Xueling Liu & Lizhuo Han (15 July 2014). "A new raptorial dinosaur with exceptionally long feathering provides insights into dromaeosaurid flight performance". Nature Communications. 5: 4382.

Iacurci, Jenna (15 July 2014). "New Four-Winged Dinosaur Built for Flight". Nature World News. Retrieved 16 July 2014.

Larsson, Hans, Hone, David, Dececchi, T. Alexander, Sullivan, Corwin, Xu, Xing. "THE WINGED NON-AVIAN DINOSAUR MICRORAPTOR FED ON MAMMALS: IMPLICATIONS FOR THE JEHOL BIOTA ECOSYSTEM" "Program and Abstracts. 70th Anniversary Meeting Society of Vertebrate Paleontology October 2010" 114A.

Meng, F.X.; Gao, S.; Liu, X.M. (2008). “U-Pb zircon geochronology and geochemistry of volcanic rocks of the Yixian Formation in the Lingyuan area, western Liaoning, China”. Geological Bulletin of China. 27: 364–373.

Morgan, James (16 July 2014). "Four-winged dinosaur is 'biggest ever'". BBC News. Retrieved 16 July 2014.

Naish, Darren (2012). Planet Dinosaur: The Next Generation of Killer Dinosaurs. Firefly Books. p. 186.

Nicholas R. Longrich; David M. Martill; Brian Andres (2018). "Late Maastrichtian pterosaurs from North Africa and mass extinction of Pterosauria at the Cretaceous-Paleogene boundary". PLOS Biology. 16 (3): e2001663.

Pickrell, John (16 July 2014). "Four-winged dinosaur had record-breaking tail feathers". Australian Geographic Society. Retrieved 16 July 2014.

Wang, Y., S. Zheng, X. Yang, W. Zhang, Q. Ni. 2006. The biodiversity and palaeoclimate of confier floras from the Early Cretaceous deposits in western Liaoning, northeast China. International Symposium on Cretaceous Major Geological Events and Earth System: 56A.

Zhou, Z. 2006. Evolutionary radiation of the Jehol Biota: chronological and ecological perspectives. Geological Journal 41: 377-393.

[a-dinosaur-a-day]

Jinzhousaurus yangi

By José Carlos Cortés on @ryuukibart

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Name: Jinzhousaurus yangi

Name Meaning: Jinzhou Reptle

First Described: 2001

Described By: Wang & Xu

Classification: Dinosauria, Ornithischia, Genasauria, Neornithischia, Cerapoda, Ornithopoda, Iguanodontia, Dryomorpha, Ankylopollexia, Styracosterna, Hadrosauriformes, Hadrosauroidea

Jinzhousaurus is another Hadrosauroid, found from the Dakangpu member of the Yixian Formation in Liaoning, China. It dates back to the Hauterivian to Barremian ages of the Early Cretaceous, about 135 to 144 million years ago. It is known from a fairly complete skeleton, about 7 meters in length and with a half a meter long skull. Originally found to be an indeterminant ornithopod, it has been since found in subsequent analyses to be a Hadrosauroid. It had some similarities to Iguanodon, such as in the shape of its snout and skull, though some parts of its jaw were different. This may indicate that it had a modified feeding strategy than Iguanodon. It was also very similar to Probactrosaurus, though less similar to Hadrosaurids than it was. It is the first large sized Ornithischian known from its ecosystem, and there are no Sauropods in its locality, indicating that it had a major role as a large sized herbivore. Furthermore, there were no large sized predators in the ecosystem, which might either be an aspect of bias or due to no large predators being present to feed on Jinzhousaurus, potentially due to flora turnover. It lived alongside such dinosaurs as Liaoningosaurus, Archaeorhynchus, Confuciusornis, Dalingheornis, Hongshanornis, Longicrusavis, Shanweiniao, Zhongornis, Sinornithosaurus, Tianyuraptor, Sinosauropteryx, and Yixianosaurus. 

Sources:

Barrett, P. M., R. J. Butler, W. Xiao-Lin, X. Xing. 2009. Cranial anatomy of the Iguanodontoid Ornithopod Jinzhousaurus yangi from the Lower Cretaceous Yixian Formation of China. Acta Paleontologica Polonica 54(1): 35-48.

McDonald, A. T., D. G. Wolfe, J. I. Kirkland. 2010. A new basal hadrosauroid (Dinosauria: Ornithopoda) from the Turonian of New Mexico. Journal of Vertebrate Paleontology 30(3): 799-812. 

Wang, X., & X. Xu. 2001. A new iguanodontid (Jinzhousaurus yangi gen. et sp. nov.) from the Yixian Formation of western Liaoning, China. Chinese Science Bulletin 46(19): 1669-1672. 

Zhou, Z. 2006. Evolutionary radiation of the Jehol Biota: chronological and ecological perspectives. Geological Journal 41: 377-393. 

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