#Euornithine

[a-dinosaur-a-day]

Trick or Treat!!! 👻

Patagopteryx!

[dinosaurs-dinosaurs-dinosaurs]

Image from Wikipedia, by Joseph C. Boone

E is for Emu! 

The Emu is a modern flightless dinosaur native to Australia. They are primarily herbivores, but also eat insects and other small arthropods for protein. It is the second tallest bird in the world, and they spend their days foraging, preening, and resting! 

[albertonykus]

Updated my size comparison chart of Mesozoic birds with new information from last year. Changes include:

Adding Microenantiornis and Orienantius

Updating the tail feathers of Archaeorhynchus

Giving colors and lobed toes to Iteravis

Full view

[jurassicsunsets]

any idea from which specific dinosaurs modern birds came to be?

Yes. Birds are neornithines, euornithines, ornithothoracens, pygostylians, avebrevicaudans, euavialans, avialans, averaptorans, paravians, pennaraptors, maniraptors, maniraptoriforms, tyrannoraptors, coelurosaurs, avetheropods, orionodens, tetenurans, averostrans, neotheropods, theropods, and saurischians. Their closest non-avialan relatives are dromaeosaurs and troodontids.

[a-dinosaur-a-day]

Trick or treat?

Yanornis!

[a-dinosaur-a-day]

Brodavis

B. americanus by Jack Wood

Etymology: Brodkorb’s Bird

First Described By: Martin et al., 2012

Classification: Dinosauromorpha, Dinosauriformes, Dracohors, Dinosauria, Saurischia, Eusaurischia, Theropoda, Neotheropoda, Averostra, Tetanurae, Orionides, Avetheropoda, Coelurosauria, Tyrannoraptora, Maniraptoromorpha, Maniraptoriformes, Maniraptora, Pennaraptora, Paraves, Eumaniraptora, Averaptora, Avialae, Euavialae, Avebrevicauda, Pygostaylia, Ornithothoraces, Euornithes, Ornithuromorpha, Ornithurae, Hesperornithes

Referred Species: B. americanus, B. baileyi, B. mongoliensis, B. varneri

Status: Extinct

Time and Place: Between 80 and 66 million years ago, from the Campanian to the Maastrichtian ages of the Late Cretaceous 

Brodavis is known from a variety of habitats, most within the Western Interior Seaway of North America, with one in Asia: the Frenchman Formation, the Hell Creek Formation, the Pierre Shale Formation, and the Nemegt Formation.  

Physical Description: Brodavis was a large bird, but a small dinosaur, reaching up to 90 centimeters in body length (though some species were half that size). It had a cylindrical body and long legs, good for propelling it through the water. It had a lightly built skeleton, though, so it wasn’t well adapted to diving - and may have even still been able to fly, though not particularly well. It had a long, skinny neck, and a small head ending in a long and pointed beak. This beak was full will small, pointy teeth for catching fish. It is unclear whether or not it had webbing between its toes, but this is definitely possible. The colors of Brodavis are poorly known, but it was certainly covered with feathers all over its body.

Diet: Brodavis would have primarily eaten fish and other aquatic life.

Behavior: Being a water-based creature, Brodavis spent most of its time near the water, swimming through along the surface and looking for food. Based on other Hesperornithines, it swam mostly with its feet, propelling them like living animals such as grebes today. Its wings, which were still probably functional, would have not been used in the water. Still, given the presence of flight in Brodavis, it probably would have been able to take off from the water to avoid danger - and back to the water to avoid more danger still, given the large predatory dinosaurs it shared habitats with. It would have then gone to the coasts to rest and rejoin other Brodavis, and would have also had nests there that they had to take care of. How social it was, or other specifics on behavior, are unknown at this time - though it would not be surprising if they lived in large family groups, given how common such behavior is in modern aquatic birds and the fact that it’s a fairly common genus of dinosaur.  

B. varneri By Scott Reid 

Ecosystem: Being known from a wide variety of habitats, it’s nearly impossible to completely describe everything Brodavis ever lived with in one dinosaur article. That being said, Brodavis tended to live along the coast of major waterways (especially in freshwater areas), where it would spend most of its time underwater but go back to the shores to rest, mate, and take care of their young. Since Brodavis was found both in the Western Interior Seaway and the Seaway of Eastern Asia, it probably would have encountered a wide variety of other dinosaurs. In the Canadian Frenchman Formation, for example, it would have encountered the small herbivore Thescelosaurus, the large hadrosaur Edmontosaurus, the horned dinosaurs Triceratops and Torosaurus, the ostrich-like Ornithomimus, and the large predator Tyrannosaurus. In Hell Creek the companions of Brodavis were many, but included other dinosaurs like Tyrannosaurus, Ornithomimus, Triceratops, Torosaurus, Edmontosaurus, and Thescelosaurus like the Frenchman Formation - but also ankylosaurs like Denversaurus and Ankylosaurus, pachycephalosaurs like Sphaerotholus and Pachycephalosaurus, the small ceratopsian Leptoceratops, another ostrich-like dinosaur Struthiomimus, the chickenparrot Anzu, the raptor Acheroraptor, the opposite bird Avisaurus, and the modern bird Cimolopteryx - and more! In the Pierre Shale, Brodavis was accompanied by other Hesperornithines like Baptornis and Hesperornis. And, finally, in the Nemegt, Brodavis lived with another Hesperornithine Judinornis, the duck Teviornis, the ankylosaur Tarchia, the hadrosaur Saurolophus, the pachycephalosaurs Prenocephale and Homalocephale, the titanosaur Nemegtosaurus, the tyrannosaurs Alioramus and Tarbosaurus, Duck Satan Himself Deinocheirus, the ostrich-mimics Anserimimus and Gallimimus, the alvarezsaur Mononykus, the therizinosaur Therizinosaurus, the chickenparrots Avimimus, Elmisaurus, Nomingia, and Nemegtomaia; the raptor Adasaurus, and the troodontid Zanabazar. Given this wide variety of habitats and neighbors, Brodavis was probably able to live in freshwater habitats, unlike other hesperornithines, and it was decidedly a very adaptable dinosaur. 

B. baileyi by Scott Reid

Other: Brodavis represents a unique group of Hesperornithines, though it’s possible the genus is overlumped, which would make the family that currently only has Brodavis in it (Brodavidae) actually informative.

Species Differences: These species differ mainly on where they’re from - B. americanus from the Frenchman Formation, B. baileyi from the Hell Creek Formation, B. mongoliensis from the Nemegt, and B. varneri from the Pierre Shale. As such, B. varneri is the oldest of the four, and may be its own genus. It is also the best known species.

~ By Meig Dickson

Sources under the Cut 

Aotsuka, K. and Sato, T. (2016). Hesperornithiformes (Aves: Ornithurae) from the Upper Cretaceous Pierre Shale, Southern Manitoba, Canada. Cretaceous Research, (advance online publication).

Bakker, R. T., Sullivan, R. M., Porter, V., Larson, P. and Saulsbury, S. J. (2006). "Dracorex hogwartsia, n. gen., n. sp., a spiked, flat-headed pachycephalosaurid dinosaur from the Upper Cretaceous Hell Creek Formation of South Dakota". in Lucas, S. G. and Sullivan, R. M., eds., Late Cretaceous vertebrates from the Western Interior. New Mexico Museum of Natural History and Science Bulletin 35, pp. 331–345.

Boyd, Clint A.; Brown, Caleb M.; Scheetz, Rodney D.; Clarke; Julia A. (2009). "Taxonomic revision of the basal neornithischian taxa Thescelosaurus and Bugenasaura". Journal of Vertebrate Paleontology. 29 (3): 758–770.

Campione, N.E. and Evans, D.C. (2011). "Cranial Growth and Variation in Edmontosaurs (Dinosauria: Hadrosauridae): Implications for Latest Cretaceous Megaherbivore Diversity in North America." PLoS ONE, 6(9): e25186.

Carpenter, K. (2003). "Vertebrate Biostratigraphy of the Smoky Hill Chalk (Niobrara Formation) and the Sharon Springs Member (Pierre Shale)." High-Resolution Approaches in Stratigraphic Paleontology, 21: 421-437.

Estes, R.; Berberian, P. (1970). "Paleoecology of a late Cretaceous vertebrate community from Montana". Breviora. 343.

Glass, D.J., editor, 1997. Lexicon of Canadian Stratigraphy, vol. 4, Western Canada. Canadian Society of Petroleum Geologists, Calgary, Alberta, 1423.

Gradzinski, R., J. Kazmierczak, J. Lefeld. 1968. Geographical and geological data form the Polish-Mongolian Palaeontological Expeditions. Palaeontologia Polonica 198: 33 - 82.

Henderson, M.D.; Peterson, J.E. (2006). "An azhdarchid pterosaur cervical vertebra from the Hell Creek Formation (Maastrichtian) of southeastern Montana". Journal of Vertebrate Paleontology. 26 (1): 192–195

Jerzykiewicz, T., D. A. Russell. 1991. Late Mesozoic stratigraphy and vertebrates of the Gobi Basin. Cretaceous Research 12 (4): 345 - 377.

Kielan-Jaworowska, Z., R. Barsbold. 1972. Narrative of the Polish-Mongolian Palaeontological Expeditions 1967-1971. Palaeontologia Polonica 27: 5 - 136.

Lerbekmo, J.F., Sweet, A.R. and St. Louis, R.M. 1987. The relationship between the iridium anomaly and palynofloral events at three Cretaceous-Tertiary boundary localities in western Canada. Geological Society of America Bulletin, 99:25-330.

Longrich, N. (2008). "A new, large ornithomimid from the Cretaceous Dinosaur Park Formation of Alberta, Canada: Implications for the study of dissociated dinosaur remains". Palaeontology. 54 (1): 983–996.

Longrich, N.R., Tokaryk, T. and Field, D.J. (2011). "Mass extinction of birds at the Cretaceous–Paleogene (K–Pg) boundary." Proceedings of the National Academy of Sciences, 108(37): 15253-15257.

Novacek, M. 1996. Dinosaurs of the Flaming Cliffs. Bantam Doubleday Dell Publishing Group Inc. New York, New York.

Martin, L. D., E. N. Kurochkin, T. T. Tokaryk. 2012. A new evolutionary lineage of diving birds from the Late Cretaceous of North America and Asia. Palaeoworld 21: 59 - 63.

Martyniuk, M. P. 2012. A Field Guide to Mesozoic Birds and other Winged Dinosaurs. Pan Aves; Vernon, New Jersey.

Pearson, D. A.; Schaefer, T.; Johnson, K. R.; Nichols, D. J.; Hunter, J. P. (2002). "Vertebrate Biostratigraphy of the Hell Creek Formation in Southwestern North Dakota and Northwestern South Dakota". In Hartman, John H.; Johnson, Kirk R.; Nichols, Douglas J. (eds.). The Hell Creek Formation and the Cretaceous-Tertiary boundary in the northern Great Plains: An integrated continental record of the end of the Cretaceous. Geological Society of America. pp. 145–167.

Tokaryk, T. 1986. Ceratopsian dinosaurs from the Frenchman Formation (Upper Cretaceous) of Saskatchewan. Canadian Field-Naturalist 100:192–196.

Varricchio, D. J. 2001. Late Cretaceous oviraptorosaur (Theropoda) dinosaurs from Montana. pp. 42–57 in D. H. Tanke and K. Carpenter (eds.), Mesozoic Vertebrate Life. Indiana University Press, Indianapolis, Indiana.

Watabe, M., S. Suzuki, K. Tsogtbaatar, T. Tsubamoto, M. Saneyoshi. 2010. Report of the HMNS-MPC Joint Paleontological Expedition in 2006. Hayashibara Museum of Natural Sciences Reasearch Bulletin 3:11 - 18.

Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. 861 pages.

[a-dinosaur-a-day]

Piscivoravis lii

By Ripley Cook

Etymology: Fish Eating Bird

First Described By: 2013

Classification: Dinosauromorpha, Dinosauriformes, Dracohors, Dinosauria, Saurischia, Eusaurischia, Theropoda, Neotheropoda, Averostra, Tetanurae, Orionides, Avetheropoda, Coelurosauria, Tyrannoraptora, Maniraptoriformes, Maniraptora, Pennaraptora, Paraves, Eumaniraptora, Averaptora, Avialae, Euavialae, Avebrevicauda, Pygostylia, Ornithothoraces, Euornithes, Ornithuromorpha, Songlingornithidae

Status: Extinct

Time and Place: 120 million years ago, in the Aptian age of the Early Cretaceous 

Piscivoravis is known from the Shangheshou Beds of the Jiufotang Formation in Liaoning, China 

Physical Description: Piscivoravis was a fairly large proto-bird, growing between 30 and 35 centimeters long. It had a strong wishbone, which would have allowed for extensive chest muscles, giving it better flight ability than most of its relatives at the time. It had large claws and digits on its feet and hands which would have been very noticeable in the wings - it’s possible it may have used those claws to cling to branches and tree trunks. Piscivoravis was preserved with feathers, which show that it had an alula. Alulas are a group of three to six small, stiff feathers growing off of the first digit in modern birds - not preserved often in Mesozoic birds, scientists have limited themselves to looking for the specialized structure in the first finger that would indicate their presence. However, Piscivoravis doesn’t have that structure - indicating the alula feathers evolved before the structure did. It also had a full fan of tail feathers - a distinctive trait of the birdie dinosaurs that would become birds proper. The feathers were broad and rounded to form a single aerodynamic surface, which would have helped it to fly.

Diet: Piscivoravis was found with fish preserved in its digestive tract, making it one of the few confirmed piscivorous Mesozoic birds.

Behavior: Piscivoravis would spend a lot of its time around the lakes of its environment, grabbing fish out of the water - a unique niche for it that would have helped it to avoid competition with other animals in its very diverse environment. It would have swallowed the food and separated it into digestible parts and non-digestible parts, and formed the latter into a pellet - much like modern hawks and owls do. This was preserved in its stomach, and it would then vomit up the pellet to save energy trying (and failing) to digest it. 

By Scott Reid 

As a strong flier, it’s possible that Piscivoravis would source over the lakes like some shorebirds today, looking for traces of fish and other aquatic sources of food under the surface. We don’t know how well it could see, however, to test if it would be able to spot such prey. It’s possible - since this was a system of lakes surrounded by forest - that Piscivoravis may have peered down at the lakes from trees (held onto with strong claws), then used their strong flight to fly down quickly towards the sources of food.

As a dinosaur, Piscivoravis most likely took care of its young, though it’s difficult to know either way without more fossils. It is uncertain whether or not it would have lived in groups - either possibility, solitary or social life, seems possible.

Ecosystem: Piscivoravis lived in the Jiufotang Formation, the later of the Jehol Biota formations that showcase the initial evolution of a lot of modern groups - especially birds, placental mammals, and flowers. It was a system of lakes, surrounded by a temperate forest. Active volcanoes nearby would explode on occasion, leading to rapid covering and then preservation of the life in the forest. The earlier Yixian Formation is somewhat better known and more diverse than the Jiufotang, but there was still a lot of fascinating creatures in the Jiufotang. Piscivoravis is known from the Shangheshou Bed, aka the second and third members of the formation, where a lot of the more famous animals of the environment are found. The environment was probably still heavily forested, mostly populated with coniferous trees and ferns, but with some burgeoning flowers as well. There was a variety of frogs and fish for Piscivoravis to feed on, though most of the named ones come from other parts of the formation.

Mammals were present in the formation - notably Lactodens and Liaconodon. The oddball, crocodile-esque Choristoderes were represented by Philydrosaurus and Ikechosaurus. Turtles include Perochelys and Liaochelys. There was the famed Jiufotang Lizard Yabeinosaurus as well. There were a lot of pterosaurs, including Sinopterus, Linlongopterus, Liaoxipterus, Chaoyangopterus, Longchengpterus, Eoazhdarcho, Huaxiapterus, Hongshanopterus, Jidapterus, and Shenzhoupterus. And this was just the non-dinosaurs. 

By José Carlos Cortés

Dinosaurs included - well, there were a lot of them. The only Ornithischian known from this member was Psittacosaurus. There were a few non-Avialan theropods, too, such as Sinotyrannus, Microraptor and Similcaudipteryx. Still, the fast majority of dinosaurs present were birdie dinosaurs, which I’m just going to list now: Longipteryx, Confuciusornis, Omnivoropteryx, Sapeornis, Sinornis, Yixianornis, Bohaiornis, Parabohaiornis, Longusunguis, Juehuaornis, Parapengornis, Fortunguavis, Cathayornis, Largirostrornis, Yanornis, Gracilornis, Eocathayornis, Jeholornis, Schizooura, Zhongjianornis, Jianchangornis, Archaeorhynchus, Songlingornis, Chaoyangia, Longchengornis, Boluochia, Houornis, Xiangornis, Huoshanornis, Pengornis, Dapingfangornis, Piscivorenantiornis, Parahongshanornis, Alethoalaornis, Yuanjiawaornis, and Bellulornis. Feel free to dig through the ADAD blog to find out about all of these. Piscivoravis probably would have feared Sinotyrannus the most out of all these members of its environment, in terms of what would eat it.

Other: Piscivoravis was a Songlingornithid, a group of early very-near-birds found in the Aptian age of China. Many other kinds coexisted with Piscivoravis, and surprisingly, a lot of the group of birdie dinosaurs that became birds (the Euornithes) had at least somewhat aquatic lifestyles. So, full beaks in modern birds evolved in water-based environments, though we’re not entirely sure why.

~ By Meig Dickson

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Zhou, S.-A., Z. -H. Zhou, and J. K. O'Connor. 2013. Anatomy of the basal ornithuromorph bird Archaeorhynchus spathula from the Early Cretaceous of Liaoning, China. Journal of Vertebrate Paleontology 33(1):141-152

Zhou, S., Z. Zhou, J. K. O’Connor. 2013. A new piscivorous ornithuromorph from the Jehol Biota. Historical Biology 26 (5): 608 - 618.

Zhou, Z.-h., F. Jin, and J.-y. Zhang. 1992. [Preliminary report on a Mesozoic bird from Liaoning, China]. Kexue Tongbao 1992(5):435-437

Zhou, Z. 1995. Discovery of a new enantiornithine bird from the Early Cretaceous of Liaoning, China. Vertebrata PalAsiatica 33(2):99-113

Zhou, X., and F. Zhang. 2001. Two new ornithurine birds from the Early Cretaceous of western Liaoning, China. Chinese Science Bulletin 46(15):1258-1264

Zhou, Z. 2002. A new and primitive enantiornithine bird from the Early Cretaceous of China. Journal of Vertebrate Paleontology 22(1):49-57

Zhou, Z., and F. Zhang. 2002. A long-tailed, seed-eating bird from the Early Cretaceous of China. Nature 418:405-409

Zhou, Z., and F. Zhang. 2002. Largest bird from the Early Cretaceous and its implications for the earliest avian ecological diversification. Naturwissenschaften 89(1):34-38

Zhou, X., and F. Zhang. 2003. Anatomy of the primitive bird Sapeornis chaoyangensis from the Early Cretaceous of Liaoning, China. Canadian Journal of Earth Sciences 40:731-747

Zhou, Z., J. Clarke, F. Zhang and O. Wings. 2004. Gastroliths in Yanornis: an indication of the earliest radical diet-switching and gizzard plasticity in the lineage leading to living birds?. Naturwissenschaften 91(12):571-574

Zhou, Z., J. Clarke, and F. Zhang. 2008. Insight into diversity, body size and morphological evolution from the largest Early Cretaceous enantiornithine bird. Journal of Anatomy 212(5):565-577

Zhou, Z.-H., F. -C. Zhang, and Z. Li. 2009. A new basal ornithurine bird (Jianchangornis microdonta gen. et sp. nov.) from the Lower Cretaceous of China. Vertebrata PalAsiatica 10:299-310

Zhou, Z., F. Zhang, and Z. Li. 2010. A new Lower Cretaceous bird from China and tooth reduction in early avian evolution. Proceedings of the Royal Society B 277:219-227

[dinosaurs-dinosaurs-dinosaurs]

Teratornis, by Nobu Tamura, CC BY 3.0

[albertonykus]

Our knowledge of Mesozoic ornithothoracine bird diversity has grown exponentially over the past 20+ years, but most of them rarely feature in paleoart. These are just the ones known from complete enough specimens for my inexperienced hand to restore.

Full view

[albertonykus]

Do you have an opinion on whether Zhongjianornis is a basal pygostylian (as in the Hartman et al. matrix) or a basal euornithine?

Zhongjianornis is tricky, because the only known specimen is poorly preserved (despite being a nearly complete skeleton) and many characters that are potentially phylogenetically informative cannot be assessed for it. Based on what we have, I could see it plausibly falling in either position. Here’s hoping a better-preserved specimen turns up.

[a-dinosaur-a-day]

Platanavis nana

By Scott Reid

Etymology: Platan Bird

First Described By: Nesov, 1992

Classification: Dinosauromorpha, Dinosauriformes, Dracohors, Dinosauria, Saurischia, Eusaurischia, Theropoda, Neotheropoda, Averostra, Tetanurae, Orionides, Avetheropoda, Coelurosauria, Tyrannoraptora, Maniraptoromorpha, Maniraptoriformes, Maniraptora, Pennaraptora, Paraves, Eumaniraptora, Averaptora, Avialae, Euavialae, Avebrevicauda, Pygostaylia, Ornithothoraces

Status: Extinct

Time and Place: Between 92 and 90 million years ago, in the Turonian age of the Late Cretaceous 

Platanavis is known from the Bissekty Formation of Uzbekistan 

Physical Description: Platanavis, for better or worse, is only known from a portion of the fused vertebrae above the hip - the synsacrum. As such, we don’t know much about it. We can seem to determine that it was a small proto-bird of some kind, and as such given the time of it being found it was probably not a modern bird (Neornithean). The size was small, and the synsacrum structure indicates that it was probably a short-tailed Avialan - somewhere around the split between Opposite Birds (Enantiornithine) and True Birds (Euornithine). So, what we can glean from that is that Platanavis was small, it was very bird-like, and it probably still had teeth in its mouth. It had a narrow, deep, and not-grooved hip. Beyond that, we cannot be sure.

Diet: Given we know very little of the morphology - especially mouth and teeth shape - of Platanavis, we can’t be sure of its diet; omnivore is probably the most likely thing we can say right now.

Behavior: Well, Platanavis could probably fly in some way, and it probably took care of its young and watched its eggs. Beyond that, we can’t really say much.

Ecosystem: The Bissekty Formation was a very diverse, “middle” Cretaceous seashore ecosystem, filled with brackish swamps and braided rivers along the coast. Unfortunately, the plant life of this environment is not known, but it wouldn’t be surprising if it was filled with horsetails and cycads and ferns, as well as some early flowering plants. It also would have been a very warm environment, being near the equator. 

By Ripley Cook 

This was an ecosystem filled with a variety of animals that were early versions of the iconic creatures of the Latest Cretaceous, especially in the dinosaurs. There was Turanoceratops, a forerunner of Ceratopsids like Triceratops and Styrcosaurus; Levnesovia, an Ornithopod very close to the soon-to-appear Hadrosaurids; Timurlengia, a transitional Tyrannosaur; Itemirus, one of the earliest known Velociraptorines (possibly, anyway); and Caenagnathasia, one of the earliest “advanced” Chickenparrots. There were loads of proto-birds, too, not just Platanavis - the “True Bird” Zhyraornis, and a gaggle of Opposite Birds including Abavornis, Catenoleimus, Explorornis, Incolornis, Kizylkumavis, Kuszholia, Lenesornis, and Sazavis. Troodontids like Urbacodon and Euronychodon were present, as was some sort of ornithomimosaur. There was also the ankylosaur Bissektipelta, and the ornithopods Gilmoreosaurus and Cionodon.

Non-Dinosaurs in the Bissekty included the huge pterosaur Azhdarcho, a variety of fish, a handful of turtles, some amphibians, and some sharks - many of which were adapted to brackish water that would have been common in the environment. There were also a very diverse selection of crocodylomorphs such as Zhyrasuchus, Zholsuchus, Kansajsuchus, and the earlier alligatoroid Tadzhikosuchus. There were also weird extinct relatives of Iguanas. In addition to all of this, there were a lot of early mammals, weird herbivorous Zhelestids and burrowing Asioryctitherians and insectivorous Zalambdalestids and almost-Marsupials and the rodent-like Cimolodonts. More research on this formation is sure to reveal more fascinating finds!

Other: Platanavis has a similar deep synsacrum to Gobipteryx, and given their similar range and Gobipteryx coming later, perhaps they’re closely related. This would make Platanavis an Enantiornithine, though of course that’s a very preliminary idea.

~ By Meig Dickson

Sources under the Cut 

Averianov, A.O. 2002. An ankylosaurid (Ornithischia: Ankylosauria) braincase from the Upper Cretaceous Bissekty Formation of Uzbekistan. Bulletin de l'Institute Royal des Sciences Naturelles de Belgique, Sciences de la Terre 72. 97–110. Accessed 2019-03-22.

Kurochkin, 2000. Mesozoic birds of Mongolia and the former USSR. in Benton, Shishkin, Unwin and Kurochkin, eds. The Age of Dinosaurs in Russia and Mongolia. 533-559.

Mourer-Chauvire, 1989. Society of Avian Paleontology and Evolution Information Newsletter. 3.

Nessov, 1992. Review of localities and remains of Mesozoic and Paleogene birds of the USSR and the description of new findings. Russkii Ornitologicheskii Zhurnal. 1(1), 7-50.

Redman, C.M., and L.R. Leighton. 2009. Multivariate faunal analysis of the Turonian Bissekty Formation: Variation in the degree of marine influence in temporally and spatially averaged fossil assemblages. PALAIOS 24. 18–26. Accessed 2019-03-22.

Sues, H.-D., and A. Averianov. 2009. Turanoceratops tardabilis—the first ceratopsid dinosaur from Asia. Naturwissenschaften 96. 645–652. Accessed 2019-03-22.

Sues, H-D., and A. Averianov. 2016. Ornithomimidae (Dinosauria: Theropoda) from the Bissekty Formation (Upper Cretaceous: Turonian) of Uzbekistan. Cretaceous Research 57. 90–110. Accessed 2019-03-22.

Weishampel, David B.; Peter Dodson, and Halszka (eds.) Osmólska. 2004. The Dinosauria, 2nd edition, 1–880. Berkeley: University of California Press. Accessed 2019-02-21.ISBN 0-520-24209-2

[a-dinosaur-a-day]

Results are in! Some surprises, some disappointments - this is going to be an interesting year, that’s for sure. 

Specific game breakdowns under the cut (okay and encouraged, however, to reblog this) 

Unsurprising, honestly 

This was a squeaker I was not expecting 

I feel like this could have gone either way 

I’m pleased with this

Large predators should win sometimes, probably

Nice

This was an uninspriring matchup

Dammit, I was hoping the Euornithine would pull ahead. Ah well 

Yeaaaaaah! 

Nice, nice 

A good smol bean

This should not have been this close. You guys do realize Ultrasaurus is literally shit, right? 

This is well-deserved 

I really didn’t know which way this would go, either, but here we are 

Yay! Nemegt! 

Yeaaaah! The Silesaurid lives on

Damn, ah well 

Digging boy! 

Poor Olorotitan, so close

This was a Squeaker

This was surprisingly a squeaker 

Wide Boy Lives! 

Could have gone either way, imo

Damn, poor Lurdu, still Miragaia’s a good one 

This is utterly unsurprising 

Huh, this is mildly surprising 

This is also surprising??

This is EXTREMELY surprising if pleasing

Revenge of the Auk fans I suppose

Max will be pleased with this

:( Ah well Turacos are cute too

Yet again, unsurprising

It’ll be interesting to see what happens in Round Two!!! Thanks everyone who voted!!!

[a-dinosaur-a-day]

Gargantuavis philoinos

By Jack Wood on @thewoodparable

PLEASE SUPPORT US ON PATREON. EACH and EVERY DONATION helps to keep this blog running! Any amount, even ONE DOLLAR is APPRECIATED! IF YOU ENJOY THIS CONTENT, please CONSIDER DONATING!

Name: Gargantuavis philoinos

Name Meaning: Gargantua Bird

First Described: 1998

Described By: Buffetaut & Le Loeuff

Classification: Dinosauria, Theropoda, Neotheropoda, Averostra, Tetanurae, Orionides, Avetheropoda, Coelurosauria, Tyrannoraptora, Maniraptoriformes, Maniraptora, Pennaraptora, Paraves, Eumaniraptora, Averaptora, Avialae, Euavialae, Avebrevicauda, Pygostylia, Ornithothoraces, Euornithes

Gargantuavis is a large, secondarily flightless Euornithine from the Marnes de la Maurine Formation of France, living about 70 million years ago, in the Maastrichtian age of the Late Cretaceous. It is known from parts of the hips, neck, and legs. It is the largest known Avialan from the Mesozoic, with a body length of about two meters and the height of a man, and it was roughly shaped like a modern moa, with a long neck, a small head, and broad hips. This would have made it a herbivorous browser, and it would have been fairly slow moving. It lived near the Tethys Sea, alongside other dinosaurs such as Rhabdodon, and was a fairly rare member of its ecosystem. 

Sources:

Martyniuk, M. P. 2012. A Field Guide to Mesozoic Birds and other Winged Dinosaurs. Pan Aves; Vernon, New Jersey.

https://en.wikipedia.org/wiki/Gargantuavis

Shout out goes to @kuzcothegreat-blog!

[albertonykus]

What is Zhyraornis?

To be honest, every time I get a question like this about fragmentary taxa of uncertain affinities, I have to wonder... what makes you think I would know?

Taxa like this are of uncertain phylogenetic position typically because they are only known from fragmentary remains, have an unusual combination of features, or both. When a solid conclusion on their affinities is eventually made, it’s usually due to detailed reexamination of the specimen, the discovery of more complete specimens (either of the taxon itself or of newly-recognized close relatives), or some combination thereof.

I haven’t had the chance to examine most of these specimens in person, so it’s unlikely that I would have much insight that hasn’t already been stated in the literature. I also don’t have magic powers that would allow me to accurately visualize a complete organism solely from fragmentary specimens (though that would be a very useful superpower to have... at least if you’re a paleontologist).

Zhyraornis is known from a couple of partial synsacra that most likely belong to ornithothoracines, with both euornithine and enantiornithine affinities having been suggested in relatively recent literature. That’s about as much as I can comfortably tell you at this point.

[a-dinosaur-a-day]

Zhyraornis kashkarovi, Z. logunovi

By Scott Reid on @drawingwithdinosaurs

PLEASE SUPPORT US ON PATREON. EACH and EVERY DONATION helps to keep this blog running! Any amount, even ONE DOLLAR is APPRECIATED! IF YOU ENJOY THIS CONTENT, please CONSIDER DONATING!

Name: Zhyraornis kashkarovi, Z. logunovi

Name Meaning: Dzhyra Bird 

First Described: 1983

Described By: Nesov

Classification: Dinosauria, Theropoda, Neotheropoda, Averostra, Tetanurae, Orionides, Avetheropoda, Coelurosauria, Tyrannoraptora, Maniraptoriformes, Maniraptora, Pennaraptora, Paraves, Eumaniraptora, Averaptora, Avialae, Euavialae, Avebrevicauda, Pygostylia, Ornithothoraces, Euornithes

Zhyraornis is a poorly known Euornithine from the place where all poorly known Mesozoic Birds are from - the Bissekty Formation of Uzbekistan. It lived in the Coniacian Age of the Late Cretaceous, approximately 92 million years ago. It has two species for some ungodly reason, both only known from parts of th ehip and some other skeletal fragments. Despite this limited material, its classification has been shunted around from group to group, though for now it rests in Euornithes. 

Sources:

https://en.wikipedia.org/wiki/Zhyraornis

http://www.paleofile.com/Dinosaurs/Aves/Zhyraornis.asp

Shout out goes to @freshstartformydinosaurs-b-blog1!

[a-dinosaur-a-day]

Ambiortus dementjevi

By Scott Reid on @drawingwithdinosaurs

PLEASE SUPPORT US ON PATREON. EACH and EVERY DONATION helps to keep this blog running! Any amount, even ONE DOLLAR is APPRECIATED! IF YOU ENJOY THIS CONTENT, please CONSIDER DONATING!

Name: Ambiortus dementjevi

Name Meaning: Vacillating Beginning

First Described: 1982

Described By: Kurochkin

Classification: Dinosauria, Theropoda, Neotheropoda, Averostra, Tetanurae, Orionides, Avetheropoda, Coelurosauria, Tyrannoraptora, Maniraptoriformes, Maniraptora, Pennaraptora, Paraves, Eumaniraptora, Averaptora, Avialae, Euavialae, Avebrevicauda, Pygostylia, Ornithothoraces, Euornithes, Ornithuromorpha

Ambiortus is an Ornithuromorph (so slightly derived Euornithine) from the Andaikhudag Formation in Bayankhongor, Mongolia. It lived about 125 million years ago in in the Barremian to Aptian ages of the Early Cretaceous, and is only known from a fragmentary skeleton. However, compared to other early Orinthuromorphs it had slender shoulders and differently arranged arm muscles, meaning it had a specialized flight mechanism. In addition, it had long primary feathers on its wings, giving it an advantage during flight. It was a small bird, only about the size of a small game bird. It was closely related to Apsaravis. 

Sources:

Martyniuk, M. P. 2012. A Field Guide to Mesozoic Birds and other Winged Dinosaurs. Pan Aves; Vernon, New Jersey.

https://en.wikipedia.org/wiki/Ambiortus

Shout out goes to @too-inlove-to-thinkstraight!