This video says about itself:
10 June 2015
For more information about this topic:
Science Mag: Earliest dinosaurs may have sported feathers
See also here.
This video says about itself:
10 June 2015
For more information about this topic:
Science Mag: Earliest dinosaurs may have sported feathers
See also here.
This video from the USA says about itself:
15 January 2009
A team of paleontologists from the University of California, Berkeley, the American Museum of Natural History and The Field Museum discovered fossils in northern New Mexico that show for the first time that dinosaurs coexisted with their non-dinosaur ancestors for tens of millions of years towards the end of the Triassic Period. This discovery, made at the Hayden Quarry in Ghost Ranch, New Mexico, disproves previous notions that dinosaurs rapidly replaced their supposedly outmoded predecessors.
From the National Science Foundation in the USA:
Big dinosaurs steered clear of the tropics
Climate swings lasting millions of years too much for dinos
June 15, 2015
The long absence at low latitudes has been one of the great, unanswered questions about the rise of the dinosaurs.
Now the mystery has a solution, according to scientists who pieced together a detailed picture of the climate and ecology more than 200 million years ago at Ghost Ranch in northern New Mexico, a site rich with fossils.
The findings, reported today in the journal Proceedings of the National Academy of Sciences (PNAS), show that the tropical climate swung wildly with extremes of drought and intense heat.
Wildfires swept the landscape during arid regimes and reshaped the vegetation available for plant-eating animals.
“Our data suggest it was not a fun place,” says scientist Randall Irmis of the University of Utah.
“It was a time of climate extremes that went back and forth unpredictably. Large, warm-blooded dinosaurian herbivores weren’t able to exist close to the equator–there was not enough dependable plant food.”
The study, led by geochemist Jessica Whiteside, now of the University of Southampton, is the first to provide a detailed look at climate and ecology during the emergence of the dinosaurs.
Atmospheric carbon dioxide levels then were four to six times current levels. “If we continue along our present course, similar conditions in a high-CO2 world may develop, and suppress low-latitude ecosystems,” Irmis says.
“These scientists have developed a new explanation for the perplexing near-absence of dinosaurs in late Triassic [the Triassic was between 252 million and 201 million years ago] equatorial settings,” says Rich Lane, program director in the National Science Foundation’s (NSF) Division of Earth Sciences, which funded the research.
“That includes rapid vegetation changes related to climate fluctuations between arid and moist climates and the resulting extensive wildfires of the time.”
Reconstructing the deep past
The earliest known dinosaur fossils, found in Argentina, date from around 230 million years ago.
Within 15 million years, species with different diets and body sizes had evolved and were abundant except in tropical latitudes. There the only dinosaurs were small carnivores. The pattern persisted for 30 million years after the first dinosaurs appeared.
The scientists focused on Chinle Formation rocks, which were deposited by rivers and streams between 205 and 215 million years ago at Ghost Ranch (perhaps better known as the place where artist Georgia O’Keeffe lived and painted for much of her career).
The multi-colored rocks of the Chinle Formation are a common sight on the Colorado Plateau at places such as the Painted Desert at Petrified Forest National Park in Arizona.
In ancient times, North America and other land masses were bound together in the supercontinent Pangea. The Ghost Ranch site stood close to the equator, at roughly the same latitude as present-day southern India.
The researchers reconstructed the deep past by analyzing several kinds of data: from fossils, charcoal left by ancient wildfires, stable isotopes from organic matter, and carbonate nodules that formed in ancient soils.
Fossilized bones, pollen grains and fern spores revealed the types of animals and plants living at different times, marked by layers of sediment.
Dinosaurs remained rare among the fossils, accounting for less than 15 percent of vertebrate animal remains.
They were outnumbered in diversity, abundance and body size by reptiles known as pseudosuchian archosaurs, the lineage that gave rise to crocodiles and alligators.
The sparse dinosaurs consisted mostly of small, carnivorous theropods.
Big, long-necked dinosaurs, or sauropodomorphs–already the dominant plant-eaters at higher latitudes–did not exist at the study site nor any other low-latitude site in the Pangaea of that time, as far as the fossil record shows.
Abrupt changes in climate left a record in the abundance of different types of pollen and fern spores between sediment layers.
Fossilized organic matter from decaying plants provided another window on climate shifts. Changes in the ratio of stable isotopes of carbon in the organic matter bookmarked times when plant productivity declined during extended droughts.
Drought and fire
Wildfire temperatures varied drastically, the researchers found, consistent with a fluctuating environment in which the amount of combustible plant matter rose and fell over time.
The researchers estimated the intensity of wildfires using bits of charcoal recovered in sediment layers.
The overall picture is that of a climate punctuated by extreme shifts in precipitation and in which plant die-offs fueled hotter fires. That in turn killed more plants, damaged soils and increased erosion.
Atmospheric carbon dioxide levels, calculated from stable isotope analyses of soil carbonate and preserved organic matter, rose from about 1,200 parts per million (ppm) at the base of the section, to about 2,400 ppm near the top.
At these high CO2 concentrations, climate models predict more frequent and more extreme weather fluctuations consistent with the fossil and charcoal evidence.
Continuing shifts between extremes of dry and wet likely prevented the establishment of the dinosaur-dominated communities found in the fossil record at higher latitudes across South America, Europe, and southern Africa, where aridity and temperatures were less extreme and humidity was consistently higher.
Resource-limited conditions could not support a diverse community of fast-growing, warm-blooded, large dinosaurs, which require a productive and stable environment to thrive.
“The conditions would have been something similar to the arid western United States today, although there would have been trees and smaller plants near streams and rivers, and forests during humid times,” says Whiteside.
“The fluctuating and harsh climate with widespread wildfires meant that only small two-legged carnivorous dinosaurs could survive.”
Dinosaurs and their exaggerated structures: species recognition aids, or sexual display devices? Here.
This 2011 video is called Ancient Reptile Tribute Three: Balaur bondoc / Dromaeosaurid – Dinosaur.
June 18, 2015
The exceptionally well-preserved Romanian dinosaur Balaur bondoc is the most complete theropod known to date from the Upper Cretaceous of Europe. Previous studies of this remarkable taxon have included its phylogenetic interpretation as an aberrant dromaeosaurid with velociraptorine affinities.
However, Balaur displays a combination of both apparently plesiomorphic and derived bird-like characters. Here, we analyse those features in a phylogenetic revision and show how they challenge its referral to Dromaeosauridae. Our reanalysis of two distinct phylogenetic datasets focusing on basal paravian taxa supports the reinterpretation of Balaur as an avialan more crownward than Archaeopteryx but outside of Pygostylia, and as a flightless taxon within a paraphyletic assemblage of long-tailed birds.
Our placement of Balaur within Avialae is not biased by character weighting. The placement among dromaeosaurids resulted in a suboptimal alternative that cannot be rejected based on the data to hand. Interpreted as a dromaeosaurid, Balaur has been assumed to be hypercarnivorous and predatory, exhibiting a peculiar morphology influenced by island endemism.
However, a dromaeosaurid-like ecology is contradicted by several details of Balaur’s morphology, including the loss of a third functional manual digit, the non-ginglymoid distal end of metatarsal II, and a non-falciform ungual on the second pedal digit that lacks a prominent flexor tubercle. Conversely, an omnivorous ecology is better supported by Balaur’s morphology and is consistent with its phylogenetic placement within Avialae. Our reinterpretation of Balaur implies that a superficially dromaeosaurid-like taxon represents the enlarged, terrestrialised descendant of smaller and probably volant ancestors.
This video says about itself:
New Welsh Dinosaur at Amgueddfa Cymru – National Museum Wales
9 June 2015
The skeleton of a new Welsh dinosaur goes on display at National Museum Cardiff.
The dinosaur is approximately 200 million years old, the oldest Jurassic dinosaur ever found in the UK. It belongs to the theropod group of dinosaurs and is related to Tyrannosaurus rex, although our dinosaur was walking the earth about 130 million years earlier than its more well known cousin.
The new Welsh dinosaur is a completely new species, previously unknown to scientists, making this discovery even more exciting.
See also here.
From daily The Independent in Britain:
The theropod, discovered by two brothers, dates back 200 million years
Tuesday 09 June 2015
A new dinosaur species has been discovered in Wales dating back 200 million years to the earliest Jurassic period, scientists say.
The fossilised skeleton of the dog-sized creature, a theropod dinosaur, is described as a cousin of the giant Tyrannosaurus rex and is believed to be the earliest specimen of a Jurassic era dinosaur ever to walk the Earth.
Described as the “find of a life-time” it was discovered on Lavernock beach near Penarth in the Vale of Glamorgan by two fossil-hunting brothers, Nick and Rob Hanigan after storms in spring 2014.
A cliff fall on the beach, revealed several loose blocks containing part of the skeleton of the dinosaur, including razor sharp teeth and claws.
It was analysed by experts from The University of Manchester, University of Portsmouth and the National Museum Wales who concluded it lived at the very earliest part of the Jurassic Period, 201 million years ago.
Dr John Nudds, senior lecturer in palaeontology at The University of Manchester said: “It is very rare to find this type of dinosaur at all and never before in Wales. In fact it is only the second dinosaur ever found in Wales.
“Theropods were vicious hunters who would prey on others. They were evolving rapidly at the start of the Jurassic period, but are only known from a few specimens worldwide.
“So this is a very exciting finding that could tell us a lot about how these species were evolving.”
It is thought that the fossil was from a juvenile animal as some of its bones are not yet fully formed. Research is still under way, with a scientific paper in progress which will reveal the name of this new species in the next few months.
The fossil will be donated to the National Museum Wales by the Hanigan brothers.
The new dinosaur’s name has yet to be revealed, although the Hanigan brothers revealed their idea of “RobandNick-A-Saurus” was turned down by palaeontologists.
Bank worker Rob joked: “Choosing a name was harder than picking one for my son.”
Dr David Martill, reader in palaeobiology at University of Portsmouth, said: “The new dinosaur was brought to my attention last year and I went up to Lancashire to see the specimen.
“There, laid out on the table, was the most beautiful little theropod dinosaur ever found in Europe.
“Although the bones were scattered on a few slabs of limestone, they were in excellent condition, and much of the skull appeared to be there.
“The teeth were small, but needle sharp, slightly curved and with the most wonderful steak-knife serrations on their edges.
“I then went to visit the discovery site, which showed that the dinosaur came from strata deposited exactly at the end of the Triassic and the start of the Jurassic. I now had the job to determine if this was a Triassic or Jurassic dinosaur. That took a lot of effort, but we are now convinced it is the first ever Jurassic dinosaur.”
The Welsh dinosaur was a small, slim, agile dinosaur, probably only about 50cm tall, which had a long tail to help it balance. It lived at the time when south Wales was a coastal region, offering a warm climate.
The dinosaur also probably had a fuzzy coating of simple proto-feathers, as did many theropod dinosaurs, and this would have been used for insulation and possibly display purposes. It may also have had simple quill-like structures for defence.
The rocks that contain the dinosaur fossil date back to a time immediately after the start of the Jurassic period, 201.3 million years ago.
At that time, the dinosaurs were just starting to diversify and the Welsh specimen is almost certainly the earliest Jurassic dinosaur in the world.
It is related to Coelophysis that lived approximately 203 to 196 million years ago in what is now the southwestern part of the United States of America. It also could be said to be a distant cousin of the much later Tyrannosaurus rex.
Nick Hanigan said: “This is a once in a lifetime find – preparing the skull and to seeing the teeth of a theropod for the first time in 200 million years was absolutely fantastic – you just can’t beat that sort of thing!”
The fossil will be on display at the main hall of National Museum Cardiff from June 9, until September 6, 2015.
This video from Britain about dinosaur research says about itself:
4 June 2015
This video shows scanning electron micrographs being reconstructed into 3D shapes based on the serial sections taken of the red blood cell-like structures.
From daily The Guardian in Britain:
75-million-year-old dinosaur blood and collagen discovered in fossil fragments
Scientists accidentally discover what appear to be red blood cells and collagen fibres during analysis of ‘crap’ fossils dug up in Canada 100 years ago
Ian Sample, Science editor
Scientists have discovered what appear to be red blood cells and collagen fibres in the fossilised remains of dinosaurs that lived 75 million years ago.
Traces of the soft tissues were found by accident when researchers at Imperial College in London analysed eight rather shabby fossils that had been dug up in Canada a century ago before finding their way to the Natural History Museum in London.
The finding suggests that scores of dinosaur fossils in museums around the world could retain soft tissues, and with it the answers to major questions about dinosaur physiology and evolution. More speculatively, it has made scientists ponder whether dinosaur DNA might also survive.
Most of the fossils the scientists studied were mere fragments and in very poor condition. They included a claw from a meat-eating therapod, perhaps a gorgosaurus, some limb and ankle bones from a duck-billed dinosaur, and a toe bone from [a] triceratops-like animal.
Intact soft tissue has been spotted in dinosaur fossils before, most famously by Mary Schweitzer at North Carolina State University, who in 2005 found flexible, transparent collagen in the fossilised leg of a Tyrannosaurus rex specimen.
What makes the latest discovery so remarkable is that the blood cells and collagen were found in specimens that the researchers themselves describe as “crap”. If soft tissue can survive in these fossils, then museum collections of more impressive remains could harbour troves of soft dinosaur tissue. Those could help unravel mysteries of dinosaur physiology and behaviour that have been impossible to crack with bony remains alone.
“It’s really difficult to get curators to allow you to snap bits off their fossils. The ones we tested are crap, very fragmentary, and they are not the sorts of fossils you’d expect to have soft tissue,” said Susannah Maidment, a paleontologist at Imperial.
The fossils are a smattering of pieces collected last century, probably directly from the ground, at the Dinosaur Park Formation in Alberta, Canada. To analyse the remains, the scientists broke tiny pieces off the fragments to expose fresh, uncontaminated surfaces inside.
Sergio Bertazzo, a materials scientist at Imperial, had been working on the build up of calcium in human blood vessels when he met Maidment and asked if he could study some fossils with an array of electron microscope techniques.
Months after the specimens arrived, Bertazzo began to look at thin sections of the fossils. He began with the therapod [sic; theropod] claw. “One morning, I turned on the microscope, increased the magnification, and thought ‘wait – that looks like blood!’,” he said.
Bertazzo suspected the blood was historic contamination: a curator or a collector had a cut when they handled the specimen. But Maidment suggested a check. Mammals are unusual among vertebrates in having red blood cells that lack a cell nucleus. If the fossil’s blood cells had nuclei, they could not be human. When they sliced through one of the cells to check, they saw what looked like a nucleus. “That ruled out someone bleeding on the sample,” said Maidment.
Another surprise was to come. Bertazzo was examining another fossil fragment, a piece of rib from some unidentified dinosaur, which had been sliced in two inside the microscope. He spotted bands of fibres, which further tests found to contain amino acids known that make up collagen, the protein-based material that forms the basis for skin and other soft tissues.
More work is needed to be sure the features are genuine blood cells and collagen. The scientists now hope to scour more fossils for soft tissues, and then work out what sorts of burial and environmental conditions are needed for their preservation.
“It may well be that this type of tissue is preserved far more commonly than we thought. It might even be the norm,” said Maidment, whose study appears in Nature Communications. “This is just the first step in this research.”
A detailed study of the soft tissues could unravel some of the long-standing mysteries of dinosaur evolution. The dinosaurs evolved from cold-blooded ancestors, but their modern descendants are warm-blooded birds. When did the transition occur? Red blood cells may hold the answer.
If collagen and red blood cells can survive for 75 million years, what about dinosaur DNA, bearing the genetic code to design, or potentially even resurrect, the beasts?
“We haven’t found any genetic material in our fossils, but generally in science, it is unwise to say never,” said Maidment. Bertazzo is hedging his bets too: “This opens up the possibility of loads of specimens that may have soft tissue preserved in them, but the problem with DNA is that even if you find it, it won’t be intact. It’s possible you could find fragments, but to find more than that? Who knows?”
Anjali Goswami, a paleontologist at University College London, said that if dinosaur soft tissues were found in many more fossils, it could have a transformative effect on research. “If we can expand the data we have on soft tissues, from fossils that are poorly preserved, that has real implications for our understanding of life in deep time,” she said.
Translated from ANP news agency and RTL Nieuws in the Netherlands today:
Nearly two hundred people have this weekend worked in Leiden on a special puzzle. They tried to fit the tiny skeletal remains of a Tyrannosaurus rex together.
Five million euros
Last year, the museum bought the complete skeleton. Using crowd funding and sponsorship, the museum received the required 5 million euros. The whole skeleton will come in September next year to Leiden. In 2018, it will get a place of honour in the new museum building.
This video from Canada says about itself:
4 June 2015
Generally, when new dinosaurs are found, they are only known from single bones or small parts of the skeleton. In this case, nearly the entire skull was preserved three-dimensionally, making scientific diagnosis relatively easy. Regaliceratops peterhewsi is a chasmosaurine, but it surprisingly shares some features of centrosaurines. What makes it different is the small size of the horns over the eyes and the large triangular and spade-shaped bony projections from the frill; features that are unexpected given that this new animal is closely related to the chasmosaurine Triceratops.
Video created by ORTHOSHOP Geomatics Ltd.
From daily The Guardian in Britain:
New species of dinosaur, the regaliceratops, discovered in Canada
Nicknamed Hellboy, the dinosaur had short horns over the eyes and a long nose horn, the opposite of the features sported by its close relative triceratops
Ian Sample, science editor
Thursday 4 June 2015 17.33 BST
When fossil experts first clapped eyes on the skull, it was clearly from a strange, horned dinosaur. When they noticed how stunted the bony horns were, its nickname, Hellboy, was assured.
Painstakingly excavated, cleaned up and measured since then, the fossilised remains have now been identified as a relative of the three-horned triceratops, and the first example of a horned dinosaur to be found in that region of North America.
Like triceratops, the new species was a herbivore. But it sported a more impressive shield, or frill, at the back of its skull, decorated with large triangular and pentagonal plates. The extraordinary features led researchers to name the new species Regaliceratops peterhewsi, a reference to the impressive crown-like frill, and to Peter Hews, a Calgary-based geologist who first spotted part of the skull jutting from the rockface in 2005.
Researchers came up with the Hellboy nickname long before they had liberated the full skull from the cliff face. The main reason was that the rock the fossil was embedded in was incredibly hard, making excavation a hellish, and years-long, task. That job was made even tougher because the Oldman river is a protected fish-breeding ground, meaning the scientists had to erect a dam at the site to prevent debris from the excavation falling into the river.
“It was a coincidence, but when we noticed that the skull had these short horns over the eyes, that really solidified the nickname,” Caleb Brown at the Royal Tyrrell Museum of Paleontology in Alberta told the Guardian. In the Hellboy comics and movies, the eponmymous demon grinds his horns to stumps with an electric sander to help him fit in with mere mortals.
But the horns of the dinosaur tell a more interesting story. Triceratops belonged to a group of horned dinosaurs called chasmosaurines. These had a small horn over the nose and two larger horns over the eyes. And while regaliceratops is definitely a chasmosaurine, it has a long nose horn and puny horns over its eyes. These features, opposite to those characteristic of triceratops, are seen in a different group of horned dinosaurs, called centrosaurines, which were extinct by the time regaliceratops came along.
The bizarre mix of features is an example of convergent evolution, where one species evolves bodily characteristics that arose separately in other species through the course of prehistory. Brown and his colleague, Donald Henderson, describe the creature’s remains in Current Biology.
“This is a really interesting new dinosaur,” said Steve Brusatte, a vertebrate paleontologist at Edinburgh University. “It’s a close relative of triceratops, but its horns and skull frill are very different. They look a lot more like other types of horned dinosaurs that lived earlier in time, which went extinct before triceratops thrived.
“What it’s indicating is that there was massive convergence between the horns and frills of those horned dinosaurs that were thriving during the final few million years before the asteroid hit and killed off the dinosaurs. Because this new dinosaur is one of the latest surviving horned dinosaurs, living at a similar time as triceratops, it is also telling us that horned dinosaurs remained quite diverse right until the end. To me, this is a strong hint that these dinosaurs were at or near the top of their game when that asteroid fell out of the sky,” he said.