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The Sauropod Thread
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Probably unwise to generalize, but most titanosaurs known thus far from decent remains (not many) appear to be high browsers. The only sauropods that look unequivocally like grazers are the wide-mouthed rebbachisaurs:
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It was what we would've known as a prosauropod (apparently the word is no longer used in scientific circles).
http://blogs.discovermagazine.com/deadthings/2018/07/09/ingentia-prima/#.W0VcVboRe1t
I honestly don´t know why this discovery is being hailed as a novelty; there are several giant prosauropods already known, including Lessemsaurus which is from about the same age.
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They may have been made by the very same sauropods that left another set of footprints in the area that were found in 1997.
https://www.inquisitr.com/5013680/140-million-year-old-dinosaur-footprints-discovered-in-dorset-quarry/0 -
Skull of a "baby" Diplodocus found, would suggest they were more versatile feeders than adults:
https://www.washingtonpost.com/science/2018/10/11/this-tiny-skull-has-big-implications-largest-dinosaurs/?noredirect=on&utm_term=.7c11cce7b347
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Capt'n Midnight wrote: »A lot of herbivore mammals will eat meat if given an opportunity.
Having your young being able to use different foods to the adult reduces some competition. Also didn't dinos grow fast and so could use more nutritious food to do that.
True. We see it a lot in birds (many grain-eating birds feed insects to their young, to provide more protein for growth), and there's also evidence of drastic diet change in certain dinosaurs, as well. ConsiderLimusaurus (a small Elaphrosaurus species, possibly?); the adults were toothless but the young had teeth and apparently ate small animals, transitioning to a plant-eating diet as they grew older...
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lack of teeth tend to make me think of insectivore rather than herbivore when I consider how hard to digest plants could be back then.True. We see it a lot in birds (many grain-eating birds feed insects to their young, to provide more protein for growth), and there's also evidence of drastic diet change in certain dinosaurs, as well. ConsiderLimusaurus (a small Elaphrosaurus species, possibly?); the adults were toothless but the young had teeth and apparently ate small animals, transitioning to a plant-eating diet as they grew older...0 -
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Capt'n Midnight wrote: »Ostriches do that too. But the stones wear out. Some have been found with diamonds inside, because they didn't wear out as fast.
Indeed! There was even a persistent belief in Medieval times that they would eat gold and even iron. And then there's this photograph from around 1930, which shows what was found inside an ostrich that died at London zoo, apparently after swallowing a large nail.
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The monstrous Jurassic sauropod vertebra called "Amphicoelias fragillimus" found during the Bone Wars in the XIX century has often been posited as a contender for the title of largest dinosaur of all times (and thus, largest land animal of all times).
Believed to have been a diplodocid, it was scaled based on Diplodocus and the like, which would've resulted in an animal 50 to 60 m long. However, a new study suggests the vertebra may actually have belonged to a different kind of sauropod, a rebbachisaurid. If so, the proportions change completely and the resulting animal may have been "only" about 30 m long.
That is still a dinosaur as long as a blue whale, and potentially the largest rebbachisaurid known.
Because the original Amphicoelias is most definitely a diplodocid, the owner of the legendary vertebra has been renamed as Maarapunisaurus fragillimus.
https://svpow.com/2018/10/21/what-if-amphicoelias-fragillimus-was-a-rebbachisaurid/amp/?__twitter_impression=true&fbclid=IwAR24-c_blHS_RJHzkuJaHvNVNx2KG67VjNSBI3cAaKnjxKjr9URI-GJ3W54
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Turiasaurs were a group of sauropods that reached gigantic size independently from other, more derived and better known linneages such as titanosaurs, brachiosaurs and and diplodocoids. Turiasaurus proper is one of the largest dinosaurs currently known at 30 m long and around 50 tons.
https://peerj.com/articles/6348.pdf
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Bajadasaurus was a dicraeosaurid- closely related to Amargasaurus, but 15 million years older. It wouldn´t surprise me if it were reclassified as an early species of Amargasaurus in the future. Both were found in Argentina.
The discoverers argue that the long spines on the neck may have been covered on a horny sheat, thus making them effective weapons. Like most other dicraeosaurids, Bajadasaurus appears to have been rather smallish for a sauropod and so the spines would've been useful to protect the neck from large theropod bites.
Part of the skull was also found, showing the eyes were located high on the head- useful for keeping watch of its surroundings while low-grazing.
Most articles are in Spanish:
https://redhistoria.com/bajadasaurus-pronuspinax-nuevo-dinosaurio-con-increibles-armas-de-defensa/
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Because Peru was mostly covered by sea during the late Cretaceous, very few dinosaur remains have been found there. The only one known thus far is this titanosaur, which was 14 m long and covered on bony scutes which were found preserved along with its bones. It was found in the 90s, and is currently displayed at the San Marcos Museum of Natural History.
The article is in Spanish.
https://elcomercio.pe/tecnologia/ciencias/dinosaurio-grande-habito-peru-titanosaurio-caracteristicas-paleontologia-noticia-602696
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