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The Ornithopod Thread- Hadrosaurs, iguanodonts and kin
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10-07-2009 4:41pm#1
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Nicknamed 'Antonio', the newly discovered 13 foot long Tethyshodros insularis was an island dwelling miniature version of the famous Iguanodon.According to Fabio M. Dalla Vecchia, who led the project, Antonio is noteworthy on many counts. Dalla Vecchia, a researcher at both the Institut Català de Paleontologia and the Universitat Autònoma de Barcelona, told Discovery News that this dinosaur:
- is only the second ever dinosaur species named in Italy
- is the most complete medium to large sized dinosaur ever found in Europe
- could be one of the most complete dinosaur skeletons in the world
- shows for the first time what close relatives to duck-billed dinosaurs looked like in detail
Tethyshodros insularis means "island dweller hadrosaurid dinosaur of Tethys."
Full article here.0 -
Two new dinosaurs related to the famous Iguanodon have been unearthed in Utah.The larger of the two animals, Iguanacolossus, would have been about 30 feet long and is described as a “somewhat ponderous beast with robust limbs.” Hippodraco, at a comparatively paltry 15 feet, was a much smaller animal, and the remains described in the paper may have even belonged to a juvenile. Although both new dinosaurs are known from only partial skeletons, the bones are distinctive enough in anatomy and in their geologic context to justify placing them in new species. (Paleontologists also found the fragmentary remains of other dinosaurs at each of the two sites, but not enough was preserved to positively identify what genera or species they might belong to.)Determining the true diversity of these iguanodonts and their relationships to one another will require more time and additional fossils, but at present it appears that the Early Cretaceous iguanodonts in western North America were quite different from their cousins elsewhere. Compared with relatives that lived at the same time in other places, both Hippodraco and Iguanacolossus appear to be relatively archaic species, meaning that they were more similar to earlier varieties of iguanodonts than the more specialized species such as Iguanodon. Andrew McDonald has already begun sorting all of this out, but for now it is clear that the Early Cretaceous West was home to a unique and varied collection of iguanodonts which we are only just beginning to understand.
Image by Lukas Panzarin
Summary article here.
Full paper here.0 -
We already suspected it but here's the proof; by studying the growth rings in the bones of polar dinosaurs paleontologists found that they were just the same as in dinos from tropical and temperate regions, suggesting these animals were fully active all year round:
http://www.terradaily.com/reports/Polar_dinosaurs_not_different_from_others_999.html
This is yet more evidence that dinosaurs were warm blooded and possibly, that polar dinosaurs had some kind of insulating covering (feathers and the like). I don´t know if you guys have a thread for this but, it is now believed that Leaellynasaura (of Walking with Dinosaurs fame... kinda) was not scaly as the show depicted it, but probably covered on some kind of feather or protofeather coat. The fact that its (extremely long) tail was flexible instead of rigid as in other dinosaurs suggests that it could wrap itself with its fluffy tail, like Arctic foxes and Snow Leopards do today, when the cold was too extreme or when it slept.
This also fits the fact that Leaellynasaura has huge eyes and optic lobe, suggesting enhanced night vision- useful during the darkest half of the year in polar regions.0 -
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It is one of the smallest herbivorous dinosaurs known from China; just 1 meter tall and about 1.5 meters long. It lived around 100 million years ago and was an ornithopod (a hypsilophodontid, I would guess?)
http://www.globalpost.com/dispatch/news/regions/asia-pacific/china/120116/yueosaurus-tiantaiensis-new-dinosaur-discovered-china0 -
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As any dino buff knows, there were at least two species of Saurolophus; one from North America and the other from Mongolia. Amazingly, fossilized skin has been found for both, and now a study finds that the scale pattern was actually quite different in both, otherwise similar species.
http://superoceras.blogspot.com/2012/02/saurolophus-skin-suggests-speciation.html
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http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0033539
It is not often that you hear/read something about Tenontosaurus that doesn´t have to do with Deinonychus.
Poor dino, forever typecast as the brutal murder victim...
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Very little known dino; this seems to be the first case of neonatal ornithopods found in Gondwana.
http://www.sciencedirect.com/science/article/pii/S1342937X12002870?v=s5
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Moderators, Recreation & Hobbies Moderators, Science, Health & Environment Moderators, Technology & Internet Moderators Posts: 92,450 Mod ✭✭✭✭
Join Date:Posts: 90688
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Not paleontology, I know, but I bet you immediatly thought of Iguanodon?
This Japanese frog uses a bony spike on its "thumb" to stab its rivals, usually leaving scars, and also to secure the female during mating (also leaving her scarred). As if that wasn´t enough, the article mentions another species (a tree frog) that also has thumb spikes but specifically targets the eyes and ear drums of its rivals often with fatal consequences.
http://blogs.discovermagazine.com/notrocketscience/2012/10/19/more-wolverine-frogs-japanese-species-uses-bony-thumb-spikes-to-fight-and-hold-onto-mates/
Maybe Iguanodon and similar dinosaurs such as Ouranosaurus and Lurdusaurus used their spikes in similar ways- meaning, not only as defensive weapons but to fight same species rivals and perhaps even targeting the most vulnerable spots of their opponents. Going for the eyes and stuff. Scary.0 -
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Capt'n Midnight wrote: »let's not forget ye olde platypus
it's so much that it's poison is very toxic but that the pain it causes is not eased by morphine because it behaves in a different way to things like snake venom.
not sure if you could call platypus venom convergent because it is so different
I think it has been suggested that Iguanodon's thumb spike had venom too, like the platypus', although I think there's no evidence of it found thus far. But wouldn´t it be cool?
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Moderators, Recreation & Hobbies Moderators, Science, Health & Environment Moderators, Technology & Internet Moderators Posts: 92,450 Mod ✭✭✭✭ Join Date:Posts: 90688
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A hadrosaur forerunner that coexisted with Utahraptor:
http://www.ploscollections.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0045712;jsessionid=86B786E2E9D209DAA937A5EB3FCE374E0 -
I think this guy is condemned to be forever mixed up with Altirhinus, even though it is a true duckbilled dino, not an iguanodont.
http://www.tandfonline.com/doi/abs/10.1080/08912963.2012.671311#preview
Not a lot of free access info to this moment, and no images. It was long known as the "Sabinas saurolophine", it had a very broad and arched snout, and that's about it.
This is the skull of a "Sabinosaurus" which I'm not sure if its the same as Latirhinus, or just a regular Kritosaurus. Seems this sort of dino was very common in southern North America back then.
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It seems to be some sort of iguanodont but the name has not been revealed yet.
Article is in Spanish. Here's the important stuff:... at least six specimens of an eight-meter long herbivore whose main trait is the beak, very sharp and divergent (?), very different from the flat beak of other dinosaurs.
The remains of the new dinosaur, an ornithopod, were revealed yesterday before the press by the director of the Fundación Dinópolis, Luis Alcalá, who explained that during the last two years and a half, 348 bones from six specimens of different sizes and probably both genders have been identified. Worth mentioning are three skulls, two of them fairly complete, teeth, bones from the scapula and pelvis, and limbs, vertebrae and ribs.
Alcalá didn´t want to reveal the name of the new species for the time being, for its analysis has yet to be published in scientific journals. He did say that its age is estimated to be about 113 and 110 million years and is a relative to Iguanodon, another common dinosaur in the area.
Alcalá also noted the importance of the fossil site, for it dates back to the Albian, the last stage of the Early Cretaceous, an age of which there are very few fossil remains in Europe.
Besides the dinosaurs, the site has yielded numerous remains of crocodiles, turtles, fish and other known species of dinosaurs, as well as diverse plants and invertebrates- a total of about 5.000 bones0 -
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It's a small ornithopod, similar to Gasparinisaura and Talenkauen.
It was about 1.5 meters long and was found in Antarctica:
http://permalink.gmane.org/gmane.science.dinosaurs.general/56156
Chances are high it was fuzzy even tho it appears naked here:
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