Post by dinosauria101 on May 12, 2019 18:55:16 GMT 5
Patagotitan mayorum
Temporal range: Cenomanian
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Order: Saurischia
Suborder: †Sauropodomorpha
Clade: †Sauropoda
Clade: †Titanosauria
Clade: †Lognkosauria
Genus: †Patagotitan
Species: †Patagotitan mayorum
Patagotitan is a genus of titanosaurian sauropod from the Bajada Colorada Formation in Chubut Province, Patagonia, Argentina. It contains a single species, P. mayorum, first announced in 2014 and then validly named in 2017 by Diego Pol and colleagues.
Description
P. mayorum has been estimated to have been 40 metres (130 ft) long, with a weight of 77 tonnes (85 tons). This makes it comparable to the next largest titanosaur, Puertasaurus (which weighed 73-83 tonnes), and thus one of the largest land animals in Earth's history.
The researchers who described the animal stated:
"Given the size of these bones, which surpass any of the previously known giant animals, the new dinosaur is the largest animal known that walked on Earth."
Upon its initial discovery, science writer Brian Switek cautioned that it was too early to calculate the exact size of the dinosaur. Brian had said it may be revised to 110 ft (34 m) and 50 short tons (45 t)
Discovery and naming
The remains were initially discovered in 2011 by a farm laborer, in the desert near La Flecha, about 250 km west of Trelew. Excavation was done by palaeontologists from the Museum of Paleontology Egidio Feruglio. The lead scientists on the excavation were Jose Luis Carballido and Diego Pol, with partial funding from The Jurassic Foundation. Seven partial skeletons, consisting of approximately 150 bones, were uncovered, and described as in "remarkable condition".
Paleoecology
Patagotitan lived during the Late Cretaceous period, between 95 and 100 million years ago, in what was then a forested region.
Ginormous, 70-Ton Titanosaur Is the Largest Dinosaur on Record
By Laura Geggel, Senior Writer | August 8, 2017 07:51pm ET
About 100 million years ago, when Earth was uncommonly warm and flowering plants had diversified into an array of bountiful blooms, the largest land-living animal on record — a massive, long-necked titanosaur — stomped around, searching for plants it could eat to fuel its enormous body, a new study finds.
The newly identified titanosaur was so immense — 69 tons (62 metric tons), which is equivalent to the weight of nearly one dozen Asian elephants — that it has claimed the title as the largest dinosaur on record, surpassing the previous record holder, another titanosaur known as Argentinosaurus hiunculensis.
Although it's exciting to discover the world's largest land-dwelling beast, the researchers said they're even more thrilled about the vast number of fossilized bones they uncovered, belonging to at least six of the giants. By comparing these newfound bones with those of other titanosaurs, the researchers were able to construct a comprehensive titanosaur family tree, they said.
This family tree shows that some of Patagonia's giant titanosaurs — including Argentinosaurus, Puertasaurus, Notocolossus and the newly identified dinosaur — are part of the same evolutionary group, known as a clade.
This clade indicates that "extreme gigantism evolved once in the history of sauropods" rather than multiple times, said study lead researcher José Luis Carballido, a researcher with the Argentine National Research Council (CONICET) who works at the Museum of Paleontology Egidio Feruglio in Trelew, a city in the Chubut province of Argentina.
The family tree shows that the clade of P. mayorum is a sister clade to Rinconsauria, a lineage that includes some of the smallest titanosaurs on record, the researchers wrote in the study. Some of these "small" titanosaurs, including Rinconsaurus and Saltasaurus had body masses of about 6 tons (5.4 metric tons).
Credit: Carballido J.L. et al./Proceedings of the Royal Society B
Colossal discovery
The modern story of the mid-Cretaceous titanosaur began in 2012, when Aurelio Hernandez, a worker on La Flecha ranch in Patagonia, Argentina, found some fossils one day while managing the ranch's sheep. Hernandez showed the spot to one of the ranch's owners, Oscar Mayo, who immediately realized that the specimens were likely dinosaur remains.
Mayo invited paleontologists at the museum to see the site, and they spent a total of 18 months excavating the bones, including an 8-foot-tall (2.4 meters) femur, or thighbone. An analysis revealed that the site contained the remains of at least six different individuals, Carballido told Live Science.
The finding was so momentous that the researchers allowed the American Museum of Natural History in New York City to display a cast of the dinosaur's skeleton in 2016, before the beast was even named. At 122 feet (37 m) long, the reconstructed dinosaur was so huge it couldn't fit into one room, and so museum curators positioned its long neck and tiny head to poke out into the museum's hallway, welcoming guests.
Now that researchers have had time to analyze the titanosaur's bones, they've formally named it Patagotitan mayorum. The genus name references Patagonia, where the dinosaur was found, and "titan" recalls Greek divinities, known for their strength and large size. The species name honors the Mayo family for their hospitality during the excavation, the researchers said in the study.
Superbig
Although all six of the P. mayorum were massive, an analysis of five femur bones and one humerus (a forelimb bone between the shoulder and elbow) revealed that these individuals "had not stopped growing," the researchers wrote in the study.
Even so, they were quite tall, and could likely reach almost 50 feet (15 m) high if their necks were pointing straight up, Carballido said
The dinosaur model is larger than the exhibition area, so it welcomes guests to the museum at the elevators, as they enter the hall.
Credit: Copyright AMNH/D. Finnin
Given that these dinosaurs were not fully grown, "this means that there are even bigger dinosaurs out there to discover," said Kristina Curry Rogers, a paleontologist at Macalester College in St. Paul, Minnesota, who was not involved with the study.
Still, it's important to note that P. mayorum isn't the largest animal by weight in the world. That honor goes to the blue whale (Balaenoptera musculus), which can weigh up to 200 tons (180 metric tons).
Vanishing lake
The six individuals were recovered from three different layers, or time periods. Perhaps so many individuals died there because there was once a lake in the region, prompting the titanosaurs to return time and again to drink from its waters, Carballido said. This is the first time that this concept, known as site fidelity, has been documented for such large animals, Carballido said.
It's possible that this lake dried out during droughts, and that these six titanosaurs died, in part, from thirst during those times, said Stephen Poropat, a paleontologist at Swinburne University of Technology in Melbourne, Australia, who was not involved in the study.
"The stench of their rotting carcasses would have attracted carnivorous theropods [such as] Tyrannotitan, who lost teeth as they fed," Poropat told Live Science in an email. As the theropods chowed down, some of the P. mayorum bones could have been "pushed deeply into the mud," ultimately fossilizing, he added.
"It will be interesting to see if any of the bones have tooth marks on them," Poropat said.
Humungous thighs
The P. mayorum fossils are "very impressive" because they are so well-preserved and enormous, Poropat said. For instance, "the thighbones they have discovered equal or exceed every other thighbone in the fossil record in size," he said.
"There is no doubt that it was pushing at the upper limits of body size, and it will be interesting to see what adaptations it developed to cope with all of the pressures that went with being so big, [such as] acquiring enough food [and] finding a mate," Poropat said.
Patagotitan mayorum, an herbivore, is the largest dinosaur on record.
Credit: G. Lio
Poropat noted that the largest titanosaurs lived within a fairly narrow time span during the mid-Cretaceous, between 113 million and 83 million years ago, in southern South America.
Perhaps the long necks and tails of these titanosaurs helped them lose excess heat, as this period had warmer-than-usual temperatures, Poropat said.
The study will be published online Wednesday (Aug. 9) in the journal Proceedings of the Royal Society B.
www.livescience.com/60080-large ... ecord.html
Journal Reference:
Carballido J, Pol D, Otero A, Cerda I, Salgado L, Garrido A, Ramezani J, Cúneo N, Krause M (2017) Data from: A new giant titanosaur sheds light on body mass evolution amongst sauropod dinosaurs. Published 9 August 2017.DOI: 10.1098/rspb.2017.1219
Abstract
Titanosauria was the most diverse and successful lineage of sauropod dinosaurs. This clade had its major radiation during the middle Early Cretaceous and survived up to the end of that period. Among sauropods, this lineage has the most disparate values of body mass, including the smallest and largest sauropods known. Although recent findings have improved our knowledge on giant titanosaur anatomy, there are still many unknown aspects about their evolution, especially for the most gigantic forms and the evolution of body mass in this clade. Here we describe a new giant titanosaur, which represents the largest species described so far and one of the most complete titanosaurs. Its inclusion in an extended phylogenetic analysis and the optimization of body mass reveals the presence of an endemic clade of giant titanosaurs inhabited Patagonia between the Albian and the Santonian. This clade includes most of the giant species of titanosaurs and represents the major increase in body mass in the history of Titanosauria.
rspb.royalsocietypublishing.org/ ... 0/20171219
Temporal range: Cenomanian
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Order: Saurischia
Suborder: †Sauropodomorpha
Clade: †Sauropoda
Clade: †Titanosauria
Clade: †Lognkosauria
Genus: †Patagotitan
Species: †Patagotitan mayorum
Patagotitan is a genus of titanosaurian sauropod from the Bajada Colorada Formation in Chubut Province, Patagonia, Argentina. It contains a single species, P. mayorum, first announced in 2014 and then validly named in 2017 by Diego Pol and colleagues.
Description
P. mayorum has been estimated to have been 40 metres (130 ft) long, with a weight of 77 tonnes (85 tons). This makes it comparable to the next largest titanosaur, Puertasaurus (which weighed 73-83 tonnes), and thus one of the largest land animals in Earth's history.
The researchers who described the animal stated:
"Given the size of these bones, which surpass any of the previously known giant animals, the new dinosaur is the largest animal known that walked on Earth."
Upon its initial discovery, science writer Brian Switek cautioned that it was too early to calculate the exact size of the dinosaur. Brian had said it may be revised to 110 ft (34 m) and 50 short tons (45 t)
Discovery and naming
The remains were initially discovered in 2011 by a farm laborer, in the desert near La Flecha, about 250 km west of Trelew. Excavation was done by palaeontologists from the Museum of Paleontology Egidio Feruglio. The lead scientists on the excavation were Jose Luis Carballido and Diego Pol, with partial funding from The Jurassic Foundation. Seven partial skeletons, consisting of approximately 150 bones, were uncovered, and described as in "remarkable condition".
Paleoecology
Patagotitan lived during the Late Cretaceous period, between 95 and 100 million years ago, in what was then a forested region.
Ginormous, 70-Ton Titanosaur Is the Largest Dinosaur on Record
By Laura Geggel, Senior Writer | August 8, 2017 07:51pm ET
About 100 million years ago, when Earth was uncommonly warm and flowering plants had diversified into an array of bountiful blooms, the largest land-living animal on record — a massive, long-necked titanosaur — stomped around, searching for plants it could eat to fuel its enormous body, a new study finds.
The newly identified titanosaur was so immense — 69 tons (62 metric tons), which is equivalent to the weight of nearly one dozen Asian elephants — that it has claimed the title as the largest dinosaur on record, surpassing the previous record holder, another titanosaur known as Argentinosaurus hiunculensis.
Although it's exciting to discover the world's largest land-dwelling beast, the researchers said they're even more thrilled about the vast number of fossilized bones they uncovered, belonging to at least six of the giants. By comparing these newfound bones with those of other titanosaurs, the researchers were able to construct a comprehensive titanosaur family tree, they said.
This family tree shows that some of Patagonia's giant titanosaurs — including Argentinosaurus, Puertasaurus, Notocolossus and the newly identified dinosaur — are part of the same evolutionary group, known as a clade.
This clade indicates that "extreme gigantism evolved once in the history of sauropods" rather than multiple times, said study lead researcher José Luis Carballido, a researcher with the Argentine National Research Council (CONICET) who works at the Museum of Paleontology Egidio Feruglio in Trelew, a city in the Chubut province of Argentina.
The family tree shows that the clade of P. mayorum is a sister clade to Rinconsauria, a lineage that includes some of the smallest titanosaurs on record, the researchers wrote in the study. Some of these "small" titanosaurs, including Rinconsaurus and Saltasaurus had body masses of about 6 tons (5.4 metric tons).
Credit: Carballido J.L. et al./Proceedings of the Royal Society B
Colossal discovery
The modern story of the mid-Cretaceous titanosaur began in 2012, when Aurelio Hernandez, a worker on La Flecha ranch in Patagonia, Argentina, found some fossils one day while managing the ranch's sheep. Hernandez showed the spot to one of the ranch's owners, Oscar Mayo, who immediately realized that the specimens were likely dinosaur remains.
Mayo invited paleontologists at the museum to see the site, and they spent a total of 18 months excavating the bones, including an 8-foot-tall (2.4 meters) femur, or thighbone. An analysis revealed that the site contained the remains of at least six different individuals, Carballido told Live Science.
The finding was so momentous that the researchers allowed the American Museum of Natural History in New York City to display a cast of the dinosaur's skeleton in 2016, before the beast was even named. At 122 feet (37 m) long, the reconstructed dinosaur was so huge it couldn't fit into one room, and so museum curators positioned its long neck and tiny head to poke out into the museum's hallway, welcoming guests.
Now that researchers have had time to analyze the titanosaur's bones, they've formally named it Patagotitan mayorum. The genus name references Patagonia, where the dinosaur was found, and "titan" recalls Greek divinities, known for their strength and large size. The species name honors the Mayo family for their hospitality during the excavation, the researchers said in the study.
Superbig
Although all six of the P. mayorum were massive, an analysis of five femur bones and one humerus (a forelimb bone between the shoulder and elbow) revealed that these individuals "had not stopped growing," the researchers wrote in the study.
Even so, they were quite tall, and could likely reach almost 50 feet (15 m) high if their necks were pointing straight up, Carballido said
The dinosaur model is larger than the exhibition area, so it welcomes guests to the museum at the elevators, as they enter the hall.
Credit: Copyright AMNH/D. Finnin
Given that these dinosaurs were not fully grown, "this means that there are even bigger dinosaurs out there to discover," said Kristina Curry Rogers, a paleontologist at Macalester College in St. Paul, Minnesota, who was not involved with the study.
Still, it's important to note that P. mayorum isn't the largest animal by weight in the world. That honor goes to the blue whale (Balaenoptera musculus), which can weigh up to 200 tons (180 metric tons).
Vanishing lake
The six individuals were recovered from three different layers, or time periods. Perhaps so many individuals died there because there was once a lake in the region, prompting the titanosaurs to return time and again to drink from its waters, Carballido said. This is the first time that this concept, known as site fidelity, has been documented for such large animals, Carballido said.
It's possible that this lake dried out during droughts, and that these six titanosaurs died, in part, from thirst during those times, said Stephen Poropat, a paleontologist at Swinburne University of Technology in Melbourne, Australia, who was not involved in the study.
"The stench of their rotting carcasses would have attracted carnivorous theropods [such as] Tyrannotitan, who lost teeth as they fed," Poropat told Live Science in an email. As the theropods chowed down, some of the P. mayorum bones could have been "pushed deeply into the mud," ultimately fossilizing, he added.
"It will be interesting to see if any of the bones have tooth marks on them," Poropat said.
Humungous thighs
The P. mayorum fossils are "very impressive" because they are so well-preserved and enormous, Poropat said. For instance, "the thighbones they have discovered equal or exceed every other thighbone in the fossil record in size," he said.
"There is no doubt that it was pushing at the upper limits of body size, and it will be interesting to see what adaptations it developed to cope with all of the pressures that went with being so big, [such as] acquiring enough food [and] finding a mate," Poropat said.
Patagotitan mayorum, an herbivore, is the largest dinosaur on record.
Credit: G. Lio
Poropat noted that the largest titanosaurs lived within a fairly narrow time span during the mid-Cretaceous, between 113 million and 83 million years ago, in southern South America.
Perhaps the long necks and tails of these titanosaurs helped them lose excess heat, as this period had warmer-than-usual temperatures, Poropat said.
The study will be published online Wednesday (Aug. 9) in the journal Proceedings of the Royal Society B.
www.livescience.com/60080-large ... ecord.html
Journal Reference:
Carballido J, Pol D, Otero A, Cerda I, Salgado L, Garrido A, Ramezani J, Cúneo N, Krause M (2017) Data from: A new giant titanosaur sheds light on body mass evolution amongst sauropod dinosaurs. Published 9 August 2017.DOI: 10.1098/rspb.2017.1219
Abstract
Titanosauria was the most diverse and successful lineage of sauropod dinosaurs. This clade had its major radiation during the middle Early Cretaceous and survived up to the end of that period. Among sauropods, this lineage has the most disparate values of body mass, including the smallest and largest sauropods known. Although recent findings have improved our knowledge on giant titanosaur anatomy, there are still many unknown aspects about their evolution, especially for the most gigantic forms and the evolution of body mass in this clade. Here we describe a new giant titanosaur, which represents the largest species described so far and one of the most complete titanosaurs. Its inclusion in an extended phylogenetic analysis and the optimization of body mass reveals the presence of an endemic clade of giant titanosaurs inhabited Patagonia between the Albian and the Santonian. This clade includes most of the giant species of titanosaurs and represents the major increase in body mass in the history of Titanosauria.
rspb.royalsocietypublishing.org/ ... 0/20171219