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The Dromaeosauridae Thread- Anything "raptor" related
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Hulsanpes, known from fragmentary remains, was found about 45 years ago but almost everything about it was a mystery, except for its tentative identification as a dromeosaur (raptor).
Now, a new study suggests it may actually be the first recovered member of the recently erected Halszkaraptorinae, a subgroup of raptors apparently adapted to an aquatic lifestyle.
Because of the fragmentary nature of the remains however, it is unclear how much Hulsanpes looked like Halskaraptor (pictured below).
https://peerj.com/articles/4868/
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https://www.sciencedirect.com/science/article/pii/S0195667118301253
The tooth came from the late Cretaceous and belonged, it is believed, to a large member of the Dromaeosauridae family- about halfway in size between Saurornitholestes and Dakotaraptor (which would make it about the size of the Jurassic Park raptors).
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Most big dinosaur findings in North America come from the western side. Although fragmentary, these eastern fossils prove that tyrannosauroids and large (4+ meter) raptors/dromaeosaurs were equally abundant during the late Cretaceous, as were ornithomimosaurs.
http://www.sci-news.com/paleontology/new-jersey-fossils-theropod-dinosaurs-06357.html
(image of an unrelated find that may also come from a giant raptor)
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Was only slightly larger than a roadrunner, but lighter.
http://www.eartharchives.org/articles/tiny-stilt-raptor-hunted-in-china-125-million-years-ago/
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The dromeosaurs that left them probably weren´t much bigger than a modern sparrow.
https://img.newatlas.com/smallest-dinosaur-tracks-5.png?auto=format%2Ccompress&ch=Width%2CDPR&fit=crop&h=347&q=60&rect=300%2C0%2C921%2C518&w=616&
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Well, it's not an interview WITH a Utahraptor, its an interview with discoverer Jim Kirkland ABOUT Utahraptor. :pac:
Pretty interesting tho.
https://www.youtube.com/watch?v=8tFfnfJrhfA
For those who have forgotten, Kirkland has been preparing a giant block of rock containing several Utahraptor specimens of different ages, which apparently died in quicksand along with other animals.
This is the latest skeletal reconstruction based on this particular fossil- which shows an animal bigger than the Jurassic Park raptors, but with a shorter, more flexible tail, a huge skull with somewhat procumbent teeth, and rather short arms and robust legs.0 -
This study finds that unenlagiine dromeosaurs (a Southern-hemisphere subgroup of the "raptor" family) were faster runners and better adapted to catching small, quick prey than the typical raptors of the Northern hemisphere such as Deinonychus, Dromaeosaurus or Velociraptor.
https://www.biorxiv.org/content/biorxiv/early/2019/02/18/553891.full.pdf
Examples of unenlagiines include one of the largest raptors ever found, Austroraptor, which was up to 5 m long or more and had very short arms for a dromeosaur. Still, it had narrow, almost spinosaur-like jaws and relatively small teeth, suggesting it too was hunting prey smaller than itself.
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Remains of large raptor-like theropod found in Antarctica:
Sadly the remains are fragmentary but they suggest a raptor-like dinosaur maybe two meters tall, comparable to the likes of Utahraptor and Achillobator, and lacking the "killing claw" of the typical dromeosaurs.
This is one of the very few known dinosaurs from late Cretaceous Antarctica.
https://www.sciencedirect.com/science/article/pii/S0195667118300120
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The lizard has been named Indrasaurus, after the god Indra of Hindu mythology who was swallowed by a dragon.
The study also suggests that Microraptor (unlike fellow feathered dinosaur Anchiornis or certain modern birds) did not regurgitate pellets with the undigested remains of its prey.
https://www.cell.com/action/showPdf?pii=S0960-9822%2819%2930713-4
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Article is in Spanish. Several fragmentary fossils were found in Mexico including a hadrosaur vertebra bitten by a tyrannosaurid, remains of what appears to be a large ornithomimid, and a tooth possibly from a dromaeosaurid similar in size to the much earlier Utahraptor.
If confirmed as a dromaeosaurid, it would be good evidence that giant raptors were a constant presence in North America throughout the Cretaceous, as the Mexican specimen would be geologically younger than Utahraptor, but somewhat older than the last known giant dromaeosaurid, Dakotaraptor.
https://www.milenio.com/estados/encuentran-coahuila-evidencia-raptor-gigante-mexico
(Image is Dakotaraptor, potentially of a similar size to the Mexican dromaeosaurid)/https://public-media.si-cdn.com/filer/3a/79/3a791e09-210b-4a62-9a8d-75fa284bc338/dakotaraptor-human.jpg)
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Testing the function of the raptor dinosaur's "iconic killing claw"
The study (based mostly on Deinonychus), finds that a grasping function is most likely, although it does not necessarily preclude its use as a close quarter stabbing or slashing weapon.
https://peerj.com/articles/7577/
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"Exquisitely preserved" Saurornitholestes shows differences with Velociraptor, but also similarities (including a specialized tooth for... combing its feathers?)
https://www.cbc.ca/news/canada/edmonton/dinosaur-raptor-u-of-a-alberta-edmonton-currie-1.5318229
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Wulong, a new microraptorine from China. Although seemingly not fully grown, it shows impressions of very well developed display (?) feathers... which makes one wonder whether they were indeed for display or had another, unknown use.
https://www.sciencedaily.com/releases/2020/01/200115164005.htm
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Dineobellator , a new dromeosaur from New Mexico.
The remains are fragmentary but it seems to have been around the same size and pretty similar to closely related Velociraptor. It lived around 67 million years ago, almost at the end of the Cretaceous.
https://www.nature.com/articles/s41598-020-61480-7.pdf
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Stable isotope analysis of iconic "raptor" Deinonychus 's teeth show juveniles had a different diet from the adults, making it unlikely that they were cared for by a family unit or "pack", instead likely occupying a different ecological niche, as in crocodiles or Komodo dragons.
https://www.sciencedirect.com/science/article/abs/pii/S003101822030225X?via%3Dihub
This compliments a study from 2015 which showed that juvenile Deinonychus had different proportions from the adults and likely posessed some degree of flight capability. There is a possibility that juvenile Deinonychus could climb or even fly up trees to escape the larger, potentially dangerous adults until they reached a certain size.
https://journals.plos.org/plosone/article?id=10.1371/journal.pone.01214760 -
Fragment of a dromaeosaur's jaw found in Alaska, proves these dinosaurs adapted even to Arctic regions.
https://www.paleoappi.it/un-pulcino-in-alaska/
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Velociraptor's endocranium reveals keen senses, active predator capabilities:Evidence from the
hindbrain and labyrinth of IGM 100/976 suggests that V. mongoliensis had an average hearing range near 2,400 Hz (similar to modern
social birds such as ravens and penguins), highly sensitive vestibulo-ocular and vestibulocollic reflexes, and a fine-tuned sense of
balance—all of which would have been advantageous as an active
predator.
https://onlinelibrary.wiley.com/doi/pdf/10.1111/joa.13253
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Microraptor found to have a feather molting pattern that allowed it to remain volant the entire year:
https://www.cell.com/action/showPdf?pii=S0960-9822%2820%2930862-9
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