Tag Archives: jurassic

Jurassic Dinosaur Fossils Illuminate the Evolution of Flight

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Paleontologists studied fossils that are 160 million years old. Anchiornis Huxley, a non-avian theropod dinosaur, was unearthed from the Late Jurassic Tianjishan Formation in northeastern China. The preserved feathers indicated that these dinosaurs had lost their flying capability. This rare find offers insights into the functions of organisms that existed 160 million years ago and their role in the evolution of flight among dinosaurs and birds.

This fossil of Anchiornis Huxley has nearly complete feathers and coloration preserved, allowing for detailed identification of feather morphology. Image credit: Kiat et al., doi: 10.1038/s42003-025-09019-2.

“This discovery has significant implications, suggesting that the evolution of flight in dinosaurs and birds was more intricate than previously understood,” said paleontologist Yosef Kiat from Tel Aviv University and his team.

“It is possible that some species had rudimentary flight abilities but lost them as they evolved.”

“The lineage of dinosaurs diverged from other reptiles approximately 240 million years ago.”

“Shortly after (on an evolutionary timeline), many dinosaurs began developing feathers, unique structures that are lightweight and strong, made of protein, and primarily used for flight and thermoregulation.”

About 175 million years ago, feathered dinosaurs, known as Penaraputra, emerged as distant ancestors of modern birds; they are the only dinosaur lineage that survived the mass extinction marking the end of the Mesozoic Era 66 million years ago.

As far as we know, the Pennaraputra group developed feathers for flight, but some may have lost that capability due to changing environmental conditions, similar to modern ostriches and penguins.

In this study, the researchers examined nine specimens of a feathered pennaraptorian dinosaur species called Anchiornis Huxley.

This rare paleontological find, along with hundreds of similar fossils, had its feathers remarkably preserved due to the unique conditions present during their fossilization.

Specifically, the nine fossils analyzed were selected because they retained the color of their wing feathers: white with black spots on the tips.

“Feathers take about two to three weeks to grow,” explains Dr. Kiat.

“Once they reach their final size, they detach from the blood vessels that nourished them during growth and become dead material.”

“Over time, birds shed and replace their feathers in a process known as molting, which is crucial for flight.” He notes that birds that depend on flight molt in an organized and gradual manner, maintaining symmetry and allowing them to continue flying during the process.

Conversely, the molting of flightless birds tends to be more random and irregular.

“Molting patterns can indicate whether a winged creature was capable of flight.”

By examining the color of the feathers preserved in dinosaur fossils from China, researchers could reconstruct the wing structure, which featured series of black spots along the edges.

Additionally, newly grown feathers, which had not fully matured, were identifiable by their deviation in black spot patterns.

A detailed analysis of the new feathers in nine fossils revealed an irregular molting process.

“Based on our understanding of contemporary birds, we identified a molting pattern suggesting these dinosaurs were likely flightless,” said Dr. Kiat.

“This is a rare and particularly intriguing discovery. The preservation of feather color offers a unique opportunity to explore the functional characteristics of ancient organisms alongside body structures found in fossilized skeletons and bones.”

“While feather molting might seem like a minor detail, it could significantly alter our understanding of the origins of flight when examined in fossils,” he added.

“Anchiornis Huxley‘s inclusion in the group of feathered dinosaurs that couldn’t fly underscores the complexity and diversity of wing evolution.”

The findings were published in the journal Communication Biology.

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Y. Kiat et al. 2025. Wing morphology of Anchiornis Huxley and the evolution of molting strategies in paraavian dinosaurs. Communication Biology August 1633. doi: 10.1038/s42003-025-09019-2

Source: www.sci.news

Two Similar Jurassic Mammals Featured Distinctively Shaped Jaw Joints

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According to recent analyses of fossils from two mammalian forms, the development of jaws in modern mammals proves to be more intricate than previously understood. (i) Polystodon chuananensis, a mid-Jurassic herbivorous tritylodont known for its relatively large size and possibly fossilized lifestyle, and (ii) Camulochondylus rufengensis, a newly identified Morganucodontan from the Early Jurassic.

Reconstructed illustration of Polystodon chuananensis. Image credit: Chuang Zhao / PNSO.

“In mammals, the joint connecting the skull to the lower jaw consists of two bones: the squamous bone and the dentary bone, where the lower jaw teeth are situated,” stated Dr. Jin Meng, a curator at the American Museum of Natural History and a researcher at the City University of New York, along with colleagues.

“This configuration replaced the older temporomandibular joint seen in reptiles, which is composed of two different bones: the quadrate and the articular bone.”

“As organisms transitioned from early mammal-like reptiles to true mammals, various ‘experimental’ versions of this new temporomandibular joint arose to withstand the forces of mastication.”

“Ultimately, this culminated in the formation of the bimandibular joint, with the new dentosquamous joint handling most of the chewing pressure, maintaining the joint functionality in reptiles, and establishing an initial system for detecting airborne sounds.”

“Over time, the dentate squamosal became the sole joint, transforming the quadratoid joint into a diminutive bone within the mammal’s middle ear, a critical feature that aids in hearing.”

However, scientists still lack a comprehensive understanding of how this new temporomandibular joint evolved, primarily due to the scarcity of fossils from this era.

“The evolution of the mammalian temporomandibular joint represents one of the most fascinating yet incomplete chapters in vertebrate history, with gaps in fossil records obscuring significant transitions,” remarked Dr. Meng.

Researchers utilized high-resolution computed tomography scans from the Institute of Vertebrate Paleontology and Paleoanthropology at the Chinese Academy of Sciences.

One of these species, Polystodon chuananensis, is an opossum-sized creature featuring “horns” potentially used for digging.

The other, Camulochondylus rufengensis, is a newly described squirrel-sized animal that lived during the Early Jurassic, approximately 174 to 201 million years ago.

Paleontologists identified new jaw structures in both ancient species.

In Polystodon chuananensis, they discovered a uniquely formed secondary temporomandibular joint located between the zygoma and dentary. This marks the first identification of this joint structure in a tetrapod.

In Camulochondylus rufengensis, they characterized a simple articular head of the dentary bone that likely indicates an evolutionary step towards a morphology adaptable to the new temporomandibular joint socket.

“These discoveries enhance the diversity of temporomandibular joints in mammalian evolution and broaden our comprehension of the evolutionary lineage of key mammalian features crucial for understanding how mammals process food and perceive airborne sounds,” the authors concluded.

Their study was published in the journal Nature in September 2025.

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F. Mao et al. Convergent evolution of diverse temporomandibular joints in mammals. Nature published online on September 24, 2025. doi: 10.1038/s41586-025-09572-0

Source: www.sci.news

New Jurassic Lizard Species Exhibits Features of Both Snakes and Geckos

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Breugnathair elgolensis – This species, part of the Hook-tooth group, thrived in the central Jurassic period around 167 million years ago, displaying a unique blend of anatomical features not usually observed in its raw group. Its head-to-body proportions, along with dental and jaw characteristics, reveal serpent-like traits, with the original extermination group linked to Jeccos.

Reconstruction of the life of Breugnathair elgolensis. Image credit: Brennan Stokkermans/National Museums Scotland.

Breugnathair elgolensis is recognized as one of the earliest relatively complete fossil lizards yet discovered.

These ancient reptiles possessed serpent-like jaws and curved teeth reminiscent of modern pythons, all while exhibiting short bodies akin to well-formed lizards.

With a length of approximately 41 cm (16 inches) from head to tail, it ranks among the largest lizards in its ecosystem and may have preyed on smaller lizards, juvenile dinosaurs, early mammals, and various vertebrates.

Dr. Roger Benson, a curator in the Department of Paleontology at the American Museum of Natural History, remarked:

“Breugnathair elgolensis features snake-like traits in its teeth and jaw, yet in many aspects, it appears surprisingly primitive.”

“This suggests that the evolutionary predecessors of snakes might have been vastly different than we anticipated. Alternatively, it may indicate that predatory behaviors similar to those of snakes developed independently in archaic, extinct groups.”

Paleontologists place Breugnathair elgolensis within a new family of reptiles (encompassing lizards and snakes) named Parviraptoridae, a group that may hold significant implications for snake origins.

“Previous studies had identified bones with snake-like teeth found alongside those exhibiting gecko-like traits,” they noted.

“However, their striking differences led some researchers to believe they belonged to two distinct species.”

“Our research on Breugnathair elgolensis challenges these earlier conclusions, demonstrating that both snake-like and gecko-like characteristics can coexist within a single species.”

The fossil remains of Breugnathair elgolensis were unearthed in 2016 by Stig Walsh of Scotland’s National Museum on the Isle of Skye.

“The Jurassic fossil sediments on the Isle of Skye are vital for understanding the early evolution of numerous living groups, including lizards, which started to diversify during this period.”

“I initially described Parviraptorids around three decades ago based on much more fragmented specimens, making this feel like discovering the top of a jigsaw puzzle years after being stumped by the original picture with a handful of pieces.”

“The array of primitive and advanced features indicated in this new specimen reinforces the notion that evolutionary pathways can be unpredictable.”

A paper discussing the discoveries related to Breugnathair elgolensis was published today in the journal Nature.

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RBJ Benson et al. Mosaic anatomy in early fossil reptiles. Nature Published online on October 1, 2025. doi:10.1038/s41586-025-09566-y

Source: www.sci.news

Paleontologists Discover Early Jurassic Ikchosaurus Fossils in British Columbia

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The partial skeleton discovered in the Fernie Formation in British Columbia, Canada, in 1916, represents a new genus and species of an extinct marine reptile named Ichaosaurus, as stated by an international group of paleontologists.

Photos and interpretation of Fernatator Prentisai skeleton in side view on the left. Image credit: Massare et al.

Fernatator Prentisai existed in North America during the early Jurassic Epoch, approximately 109 million years ago.

“Ichthyosaurs—marine reptiles that superficially resemble dolphins—were prominent marine predators from the early Triassic (Olenek) to the beginning of the late Cretaceous (Cenomanian),” noted Professor Judy Massare from SUNY College.

“They were the dominant large predators of the Triassic and early Jurassic seas.”

“Many partial and complete skeletal remains of early Jurassic ichthyosaurs have been collected, primarily from England and Germany.”

“The early Jurassic Ektisaurus in North America is considered rare,” they emphasized.

“Hence, the discovery of partial skeletal remains from western Canada is significant.”

Excavation of Fernatator Prentisai skeleton. The podium is incomplete, but the additional parts that were lost have since been preserved. T. Prentice At Light, WR Wilson, the general manager of CNP Coal Company, is on the left. Photo taken around 1916, between the Elk River, Morrissey, and Fernie, British Columbia. Photographer unknown. Image credit: Massare et al.

The skeleton of Fernatator Prentisai was found by T. Prentiss in the summer of 1916 while fishing on the Elk River in British Columbia, Canada.

“This specimen represents the most complete ichthyosaur known from the early Jurassic in North America and is one among several ichthyosaur specimens known from the Fernie Formation in western Canada,” the paleontologist remarked.

This new species is a medium-sized ichthyosaur, measuring 3-4 m (10-13 feet) in length, with a distinct combination of features.

“As preserved, the entire skeleton measures 2.8 m long, which includes an impression of the front of the podium,” the researcher added.

“In life, this skeleton likely reached approximately 3.5 m in length, possibly even 4 m.”

“Despite the poor preservation, there is enough identifiable morphology to justify the designation of a new genus and species,” they noted.

“It is characterized by a tall, bar-like orbital, short straight jugals that do not extend beyond the anterior or posterior of the orbit, a long, narrow anterior process of the maxilla, and a cora-like body with a broad curved outer end and a deep anterior region, among other features.”

Fernatator Prentisai symbolizes a sparse record of early Jurassic ichthyosaurs, validated from the Early Jurassic in Canada, and is a significant addition to ichthyosaur taxonomy.

A paper detailing this discovery has been published in the June 2025 issue of the journal Paldicola.

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Judy A. Massare et al. 2025. The most complete early Jurassic ichthyosaur from North America. Paldicola 15(2): 86-99

Source: www.sci.news

Newly Discovered Herbivorous Dinosaur Species from the Jurassic Period Unearthed in China

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A newly identified genus and species of the Eusauropod dinosaur has been discovered from a fossilized partial skeleton, which includes almost complete skulls, located in Ganshu province, China.

Skull of niedu in side view. Image credits: Li et al., doi: 10.1038/s41598-025-03210-5.

The newly recognized dinosaur species existed during the mid-Jurassic period, roughly 165 million years ago.

Named niedu, it is an early representative of the long-necked, exclusively herbivorous dinosaurs known as Eusauropoda.

“Sauropod dinosaurs, which are massive herbivores from the early Jurassic to the late Cretaceous period, have been found across all continents,” stated Dr. Ning Li, a researcher at a Chinese university of Earth Sciences.

“Due to global warming events occurring during the Late Jurassic, Eusauropod has become the sole surviving sauropod lineage.”

“In the middle and late Jurassic, non-neosauropods thrived, including taxa like Schnosaurus, Omeisaurus, and core forms of Mamenchisaurus.

Fossils of niedu were gathered from the base of the Xinhe Formation near Jinchan city in Gansu province, northwestern China.

The specimen comprises five cervical vertebrae and nearly complete mandibles, alongside 29 distinct caudal vertebrae.

The skull of niedu measures approximately 31 cm in length and 12.5 cm in height.

A sauropod dinosaur being chased by two carnivorous dinosaurs. Image credit: Lida Xing.

“Finding a well-preserved skull is uncommon in non-neosauropod eusauropods due to their fragility,” the paleontologist noted.

“The skull of niedu is exceptionally well maintained and nearly complete.”

“However, the left side of the skull shows deformation due to internal compression.”

“Most cranial sutures are clearly visible on niedu,” they added.

According to the researchers, niedu marks the earliest sauropod discovered in Gansu province.

“niedu is significant,” they concluded.

“We also present more information that enhances our understanding of sauropod evolutionary history in northwestern China.”

The paper was published in the journal Scientific Reports on May 23rd.

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N. Li et al. 2025. A new Eusauropod (dinosaurs, sauropods) from the central Jurassic in China. Sci Rep 15, 17936; doi:10.1038/s41598-025-03210-5

Source: www.sci.news

Fossils of Central Jurassic Serapodan Dinosaurs Discovered in Morocco

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A research team from Sidi Mohamed Ben Abdela University, the University of Birmingham, and the Museum of Natural History in London has identified a new specimen as the oldest known Serapodan Ornithischian dinosaur.

Proximal femurs of the Serapodan dinosaur from the Elmers III Formation in the Central Atlas Mountains of Morocco. Image credit: Maid et al., doi: 10.1098/rsos.241624.

“Serapod has received significant attention lately,” said Dr. Susanna Maid, a paleontologist at the Museum of Natural History, University of Birmingham.

The early Serapodan, a key player in the Cretaceous terrestrial ecosystem, was bipedal and featured hadrosaur-like skeletal structures. In contrast, late Cretaceous forms, including hadrosaurs and ceratopsids, evolved more specialized adaptations.

“Serapodans can be divided into two major clades: Ornithopoda, which encompasses non-hadrosaur Iguanodons and duck-billed Hadrosaurs, and Margin Osephalia, which includes horned and dome-headed species like Pachycephalosaurs.”

“While Serapodans are well-documented from the Cretaceous, their presence in the Jurassic is less established,” the researchers noted.

“Various Jurassic tracksites indicate that sizable ornithopods (likely related to Iguanodon) had emerged by this time, yet body fossils remain scarce.”

“There’s a pressing need for additional specimens from historically underrepresented regions to help clarify the early evolution of Serapodans and resolve ongoing phylogenetic discrepancies.”

A new specimen, representing part of a left femur, was collected from the Elmers III Formation in Boulafa, near Bruman in Morocco’s Middle Atlas Mountains in 2020.

These fossils date to the Basonian stage (Central Jurassic), approximately 165 to 160 million years ago.

The diverse green and red mudstones of this formation have yielded significant fossils, including Africa’s oldest known antirosaurus, Spicomellus afer, and one of the oldest Stegosaurus species, Adratiklit boulahfa.

The newly identified specimen is now recognized as the oldest Serapodan, adding valuable data to our understanding of Central Jurassic taxa.

“Despite its fragmentary nature, the specimen exhibits key features, including a distinct neck of the femoral head and a noticeable relationship between the head and the greater trochanter.”

“Further exploration and sampling of Elmers III Formation in Morocco are crucial for deepening our understanding of Oritesian dinosaur evolution during the Central Jurassic.”

The research team’s study was published in the journal Royal Society Open Science on March 12, 2025.

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Susanna Maid et al. 2025. The world’s oldest Serapodan Ornithischian dinosaur from the Jurassic of central Morocco. R. Soc. Open Sci 12(3): 241624; doi: 10.1098/rsos.241624

Source: www.sci.news

Chinese Jurassic bird fossils challenge traditional theories of bird evolution.

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Excavated in southeastern China, fossils of Jurassic birds are said to have a significant impact on the history of bird evolution, according to researchers.

The recently discovered Baminolis Zengensis, a bird the size of a quail, flew in the skies approximately 150 million years ago during the Jurassic period. A study about it was published on Wednesday in the Nature Journal. In essence, it is one of the oldest known birds to humanity, alongside the iconic Archeopteryx found in Germany in 1862 and of a similar age.

“For over 150 years, Archeopteryx has stood alone,” said Steve Bursatte, a paleontologist at the University of Edinburgh. Further explanation on the research accompanied this statement.

“All this time, it has remained as the sole unsuspecting bird fossil from the Jurassic era,” he mentioned to NBC News via email.

While other bird-like Jurassic fossils were found, there was a “significant mystery and frustrating gap” in the fossil record, according to Bursatte. So, where were their fossils?

The 2023 discovery of Baminornis in Zhenghe County, Fujian Province, China, filled that gap and became one of the most important discoveries since Archeopteryx, labeling it as “the second unsuspecting bird from the Jurassic era.”

Unlike the half-bird, half-reptile that had a long, thin tail resembling a velociraptor, Baminonis had a short tail where some vertebrae fused into short, sturdy nubins pushing the body center towards the wings, similar to modern birds for better flying.

Until the discovery of Baminoris, short tails were only found in birds known to have lived around 20 million years later, such as Eoconfuciusornis and Protopteryx.

Brusatte expressed excitement that Baminoris was more advanced than Archeopteryx and could fly much better.

Baminornis was more anatomically complex than Archeopteryx, being a “primitive” bird with claws and sharp teeth resembling dinosaur ancestors.

The discovery of two similarly aged birds about 5,500 miles apart led the nature research team to believe that bird evolution took place millions of years earlier than previously thought.

In addition to dozens of fossils of aquatic or semi-aquatic animals, the Zhenghe Fauna collection included at least three Aviaran fossils, enriching the understanding of early diversification and filling important gaps in the evolutionary history of terrestrial ecosystems towards the end of the Jurassic era according to researchers.

Baminornis fossils preserved most of the skeleton, but the wings were not preserved, leaving questions about their size and wing structure. The lack of a skull also limits clues regarding their diet.

Nevertheless, Baminornis suggests that various birds lived during the Jurassic period and flew in different ways,” Brusatte said.

Source: www.nbcnews.com

The Benefits of Adding Feathers to Jurassic Park’s Velociraptors

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Jurassic Feathered Park

The wheel of time turns, the cycle repeats and another Jurassic Park movie is coming out this year. Feedback has faint hopes due to the presence of director Gareth Edwards, who proved in Monsters and Godzilla that he can direct films featuring huge creatures. But still, yawn.

While we all wait with bated breath, YouTuber CoolioArt is supplying dinosaur footage to keep us sated. They are using the animation tool Blender to redo key scenes from the original Jurassic Parkin order to give the Velociraptors feathers. So far, they have done the kitchen scene and the climactic scene in the visitor center (just before, spoiler alert, the Tyrannosaurus rex saves the day).

Given the amateur nature of the project, the animations are really good. However, one problem remains: the raptors are still way too big. You see, despite his reputation for careful research, Jurassic Park author Michael Crichton was a bit prone to getting things badly wrong.

Crichton's biggest scientific fail was controversial his 2004 climate change novel State of Fear. This features environmental terrorists who fake natural disasters to convince the world of the dangers of global warming. They have to do this because, in the universe of the bookall the scientific evidence that greenhouse gas emissions are heating up the climate is flared or faked.

There is even a series of pages entirely dominated by graphs from weather stations in the US that show local temperature declines, and which are meant to be more meaningful than the trend in the average global temperature for some reason. Crichton also recycles the myth that the warming trend is an artefact of “urban heat islands”. It's like a terrible Reddit thread in book form.

Even Jurassic ParkCrichton's most famous creation, wasn't immune. He wanted to feature a dromaeosaurid dinosaur, as they were understood to be fast and intelligent hunters – contrasting with the lumbering T. rexUnfortunately, the scariest ones had a name that Crichton didn't think was cool – Deinonychus antirrhopus – so he used every detail of that species but incorrectly called them Velociraptor.

That's why, in the books and films, an adult Velociraptor is about as tall as a human being. In reality, a Velociraptor was about as tall as a turkey. Feedback imagines that an angry Velociraptor could still cause problems for a human being, but it's just not the same when the terrifying predator is about the size of the average toddler.

The irony is that the evidence that dromaeosaurids had feathers was pretty equivocal in the 1990s, so it was justifiable to present the raptors as featherless – but not to triple their height.

Which explains why CoolioArt has overdubbed some of the dialogue in the kitchen clip. When the girl whispers “What is it?”, a female voice dubbed over the boy's now cheerily says “It's a Deinonychus“. 10/10, no notes.

AI for rOAds

Sometimes, on a gray Monday when the column is due, Feedback can be found hastily scratching around for story ideas because nobody has done anything especially within silly sight of us. However, on Monday 13 January the following item dropped into our lap.

The UK government announced that it was going to “unleash AI” because of its “vast potential” to improve the country's decaying public services. This vision of the future is called the AI Opportunities Action Plan. Feedback feels that the name could have used a bit of work: it abbreviates to AIOAP, which sounds like the Terminator movie Arnold Schwarzenegger will make when he's 85 and an old-age pensioner himself.

The AIOAP contains a lot of proposals, one of which caught Feedback's eye. to BBC News“AI will be fed through cameras around the country to inspect roads and spot potholes that need fixing”.

Like a rabbit caught in headlights, or, more aptly, like a driver heading straight for a pothole because they're being tailgated and there's no room to steer, Feedback found ourself staring blankly forward into space, stunned by the visionary nature of this vision .

It's not that we doubt that AI could be trained to spot potholes. On the contrary: it would probably do it rather well. Instead, we are concerned that this might be solving a non-existent problem.

The BBC reported in March 2024 that English and Welsh roads are blighted by potholes, with a backlog of repairs estimated to cost £16.3 billion. That is a long way short of “Elon Musk buying Twitter” money, but it's still roughly equivalent to the GDP of Jamaica. Furthermore, Feedback can attest to a deep familiarity with the numerous potholes in our local area , many of which have gone unrepaired for months.

The problem, in short, doesn't seem to be lack of knowledge about where the potholes are. We wouldn't have a backlog that would cover the cost of building several skyscrapers if the potholes weren't being logged. This is doubly so for any road busy enough to have cameras on it.

Instead, the problem seems to be getting the actual repairs done. Feedback doesn't see how the AI ​​will help with that. No, we need to turn to genetics.

The only solution is an army of Ron Swanson clones to go and fill the potholes.

Got a story for Feedback?

You can send stories to Feedback by email at feedback@newscientist.com. Please include your home address. This week's and past Feedbacks can be seen on our website.

Source: www.newscientist.com

Rare Jurassic dinosaur discovered in Colorado

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Paleontologists from Western University of Health Sciences, Brigham Young University, Arizona Museum of Natural History, and Auburn University reported on the new specimen. haplocanthosaurus Based on bones excavated from the Dry Mesa Dinosaur Quarry near Delta, Colorado, USA.

Artist's impression Haplocanthosaurus delphis. Image credit: Michael BH / CC BY-SA 3.0.

haplocanthosaurus is a small genus of middle sauropod dinosaur that lived during the Late Jurassic Period, 155 to 152 million years ago.

Currently, only members of this genus are known. Haplocanthosaurus delphis and Haplocanthosaurus Priscus.

“haplocanthosaurus is a mysterious sauropod excavated from the Upper Jurassic Morrison Formation of the western United States,” said a paleontologist at Western Health University. Matthew Wedel And my colleagues.

“haplocanthosaurus Far fewer individuals (approximately 11 specimens) are known compared to many of the famous Morrison Formation sauropods, such as Apatosaurus, diplodocusand camarasaurusall of which are known from some of over 100 individuals. ”

“Furthermore, important parts of the skeleton, such as the skull, forelimbs, and manus and pes, have not been recovered or described to date.”

“As a genus, haplocanthosaurus “It occurs in many positions on the phylogeny,” they added.

“Studies have found it just outside of basal diplodocoids, basal megafauna, or possibly neosauropods, indicating a precarious position in the sauropod phylogeny.”

“However, most recent studies have converged towards recovery. haplocanthosaurus as a basal diplodocoid. ”

Block of the three anterior dorsal vertebrae haplocanthosaurus Stored in articulations. Scale bar – 10 cm. Image credit: Boisvert others., doi: 10.1002/ar.25520.

new specimen of haplocanthosaurus It was discovered at the Dry Mesa Dinosaur Quarry near Delta, Colorado.

It consists of three anterior dorsal vertebrae, four separate posterior dorsal vertebrae, and the right tibia.

“The new individual is haplocanthosaurus “Identified based on the presence of dorsally angled transverse processes, high neural arch crus, and wide distal tibia,” the researchers said.

geologically youngest haplocanthosaurus Specimens from the Colorado Plateau.

“This individual extends the range of this genus into the true Brushy Basin member of the Morrison Formation,” the authors said.

their paper Published in anatomical record.

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Colin Boisvert others. 2024. New specimen description haplocanthosaurus From Dry Mesa Dinosaur Quarry. anatomical records 307 (12): 3782-3800;doi: 10.1002/ar.25520

Source: www.sci.news

Unusually short, stiff, pointed tails in Jurassic pterosaurs.

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Skifosoura Baybaritsa is a type of pterosaur that lived in what is now southern Germany about 149 million years ago, bridging the gap with earlier organisms. monophenestratan pterosaur and after that pterosaur.

Two people's lives restored Skifosoura Baybaritsa In flight. Image credit: Gabriel Uguet.

For 200 years, paleontologists have divided pterosaurs into two major groups: the early non-pterodactyls and the later, much larger pterodactyls.

Early pterosaurs had short necks, short heads, short bones at the wrists of the wings, fifth toes and long tails, but pterosaurs had the opposite: long necks, large heads, long wrists, and long tails. It had a short fifth finger. Toes and short tail.

However, it was unclear which parts of the body changed between these groups.

In the 2010s, a series of intermediate species called Darwinopterans were discovered, showing that their heads and necks changed before the rest of their bodies.

This was a great example of an intermediate individual filling an evolutionary gap.

But it also meant that we didn't really know what was happening before and after these changes.

Skifosoura Baybarica I'm going to sit between these earlier. Darwinopteran and pterodactyloid.

Although it retains a very pterodactyl-like head and neck, it has also been shown to have longer wrists and shorter toes and a tail than early Darwinpterans, but these are not as extreme as seen in pterodactyls. Not.

“This is an incredible discovery,” said lead author Dr. David Horne, a paleontologist at Queen Mary University of London.

“This will really help us understand how these amazing flying animals lived and evolved.”

“We hope this study will provide a basis for further future research on this important evolutionary transition.”

“Pterosaurs have long been symbols of a unique past life,” says co-author Dr. Adam Fitch, a paleontologist at the University of Wisconsin-Madison.

“Skifosoura Baybaritsa This represents an important new form for elucidating the evolutionary relationships of pterosaurs and, by extension, how this lineage arose and changed. ”

Almost complete, but fragmented specimen Skifosoura Baybaritsa It was discovered in 2015 in the Schaudiberg quarry near Mülheim, Bavaria, Germany.

Although specimens are preserved in three dimensions, most pterosaurs tend to be crushed flat. When alive, it had a wingspan of about 2 meters (6.6 feet), which is thought to have been similar to that of large birds such as golden eagles.

Co-author Dr René Lauer of the Lauer Foundation said: “The specimens were disjointed and often had overlapping bones of varying quality.''

“Digital photographs of the specimens taken in both visible and ultraviolet light greatly aided the process of identifying these elements and better analyzing details that cannot be discerned in normal sunlight alone.”

“The Lauer Foundation is proud to have the opportunity to bring this important specimen to science and further our understanding of pterosaur evolution,” added co-author Dr. Bruce Lauer of the Lauer Foundation. .

In addition to indicating the intermediate position of Skifosoura Baybaritsait has also been shown to be a species of Scottish pterosaur. dearkfits into a mirror position between early pterosaurs and the first Darwinopterans.

“In other words, we now have a complete evolutionary sequence from early pterosaurs to pterosaurs. dearkto the first Darwinopteran Skifosoradown to the pterodactyls,” the paleontologist said.

“Although not all specimens are complete, we are now able to track increases in head and neck size, wrist extensions, toe and tail reductions, and other features step-by-step across multiple groups. .”

“This is a great example of the evolution of a group whose transition has so far been far from clear-cut.”

“both deark and Skifosora It also suggests that the changes that allowed pterosaurs to reach giant sizes were also present in these transitional species. ”

of study Published in today's magazine current biology.

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david william elliott horn others. A new large monophenestratan reveals an evolutionary transition from pterosaurs to pterosaurs. current biologypublished online on November 18, 2024. doi: 10.1016/j.cub.2024.10.023

Source: www.sci.news

Paleontologists discover significant discrepancies in growth patterns between ancient and modern mammals from the Jurassic era

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In a new study, paleontologists used synchrotron X-ray tomography of annual growth in dental cementum from fossil mammals belonging to three Jurassic animal groups to elucidate the origin of mammalian growth patterns that are intrinsically linked to mammals being warm-blooded.

Jurassic forest mammals. Image courtesy of © Zhao Chuang.

“This is the first time we've been able to reconstruct the growth patterns of early mammals in such detail,” said Dr Elise Newnham, a postdoctoral researcher at Queen Mary, University of London and the University of Bonn.

“By studying the spacing and texture of these growth rings, we can not only tell us how fast they grew at different stages of their life, but also make inferences about their metabolism and overall lifespan.”

The study calls into question previous assumptions about the growth patterns of our mammalian ancestors and the idea that these animals may have grown in a way similar to modern mammals.

Instead, the study answers a question raised by similar recent studies of early mammalian ancestors: when did modern mammalian life cycles evolve?

The researchers found that the first signs of modern mammalian growth patterns — high growth rates in young animals that stop at puberty — began in the earliest true mammals about 130 million years ago, compared with relatively little change throughout their lives in previously evolved mammalian forms.

However, like mammals, these animals grow slower and live much longer than modern small mammals such as mice and mice, with a maximum lifespan of 8 to 14 years.

The timing of this change in growth rate, combined with changes in tree-ring structure, indicates when these animals reached puberty and possibly sexual maturity.

“These data suggest that while all living small mammals reach sexual maturity within a few months of birth, the earliest mammals took several years to reach sexual maturity, supporting the results of a recent study on one of our study animals. Cruxatodon” Dr Pam Gill, a researcher at the Natural History Museum and University of Bristol, said:

“What's more, we find that this long, drawn-out life history was common to early mammals throughout the Jurassic Period.”

“Our results suggest that distinctive mammalian life history traits, such as high metabolic rate and extended parental care, evolved gradually over millions of years,” Dr Newnham said.

“The Jurassic period appears to have been a pivotal period in this evolution.”

The researchers used a technique called synchrotron X-ray tomography to image tiny growth rings in fossilized root cementum, the bone tissue that attaches teeth to the jaw. These rings are similar to those found in trees, but on a microscopic scale.

By counting the growth rings and analysing their thickness and texture, they were able to reconstruct the growth patterns and lifespan of the extinct animals.

“This work is a great example of how new technologies are revolutionizing our understanding of the distant past,” said Professor Thomas Martin from the University of Bonn.

“By closely examining these fossilized teeth, we can gain valuable insight into the lives of organisms that lived millions of years ago.”

“We are incredibly excited to be involved in this project,” said researcher Dr Jen Bright, from the University of Hull.

“Putting Jurassic fossils in a particle accelerator (synchrotron) to reconstruct the past sounds like science fiction, but it's actually possible!”

of Investigation result Published in a journal Scientific advances.

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Ellis Newham others2024. Origin of mammalian growth patterns during the Jurassic mammalian radiation. Scientific advances 10(32); doi: 10.1126/sciadv.ado4555

Source: www.sci.news

Ancient fossils reveal slower growth rates in mammals compared to modern species from Jurassic period

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Cruxatodon kiltlingtonensisA small mammal from the Jurassic period

Maiya Carrara

During the Middle Jurassic, small mammals lived much longer than modern ones and received parental care for years rather than weeks, suggesting that at some point there was a major change in the growth rates of small mammals, although the exact cause is unknown.

The discovery is based on two fossil skeletons of extinct mouse-sized creatures. Cruxatodon kiltlingtonensis, It lived on the Isle of Skye in Scotland about 166 million years ago, and its fossils were unearthed decades apart, the first in the 1970s and the second in 2016.

The unusual discovery of two fossils of the same species, one adult and one juvenile, allowed the team to compare the specimens to study how the animals grew and developed. “That meant we could ask questions we never dreamed of with just one specimen,” he says. Elsa Panciroli At the National Museum of Scotland.

First, the scientists used X-ray images to count the growth rings on the specimens' teeth, which are similar to growth rings on tree trunks and can be used to estimate age. They found that the adult specimens were about 7 years old, and the juvenile specimens were between 7 months and 2 years old.

Panciroli said he expected the fossil to be much younger, since the pup still had its baby teeth. “This was quite surprising, as this animal is about the size of a squirrel or a shrew,” Panciroli said. “We would have expected its teeth to grow back within a few weeks or months, so we could see straight away that it must have been developing quite differently. [than modern species].”

This discovery K. Quiltrington Mice took up to two years to wean from their mothers, a big jump from the few weeks most small mammals require today. Analysis of the length and size of the fossil bones reveals that the animals “grew throughout their lives,” Panchiroli says. Today, small mammals like mice grow rapidly when they're young but then stop growing as adults.

It's unclear exactly when and why small mammals evolved this way, but Panchiroli said it could be linked to environmental changes or it could be the result of mammals having warmer blood and a faster metabolism.

Panciroli and her team return to Skye every year, and are optimistic that they will be able to better understand these changes: “Hopefully in the coming years we'll find more fossils and new ways to ask these questions,” she says.

topic:

Source: www.newscientist.com

Pterosaurs from the Jurassic period had wingspans of at least 10 feet

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A team of paleontologists Ctenochasmatoid pterosaur Discovered in the Kimmeridg Clay of Oxfordshire in central England, this specimen is one of the largest Jurassic pterosaur fossils, with an estimated wingspan of at least 3 metres (10 ft), and is the first pterodactyl pterosaur described from the Jurassic of Britain.

Partial wingspan profiles of large Jurassic pterosaurs: pterodactyloides (left), including the new fossil (EC K2576), and rhamphorhynchids (right). Image courtesy of Etienne others., doi: 10.1016/j.pgeola.2024.05.002.

Pterosaurs were flying reptiles of the Mesozoic era characterized by a flight membrane stretched between their forelimbs and hindlimbs and an extremely elongated fourth digit consisting of four elongated phalanges.

The largest Cretaceous form was Aramburgiana, Hatzegopteryx and QuetzalcoatlusThe combined wingspan reached a length of over 10 metres (33 ft).

However, Triassic and Jurassic forms were considerably smaller, with a typical wingspan of 0.5 to 2 metres (1.6 to 6.5 ft).

There is evidence that some Jurassic species also achieved large wingspans, but these rarely exceeded 3 metres (10 ft).

The new pterosaur fossil was discovered in the Kimmeridge Clay near Abingdon-on-Thames, Oxfordshire, England.

This specimen is a wing bone, broken into three pieces but still well preserved.

The team said the dinosaur belonged to adult Ctenophora, a group of pterosaurs known for their elongated wings, long jaws and thin, bristle-like teeth.

“When the bones were discovered their size was certainly remarkable,” said Professor David Martill, from the University of Portsmouth.

“We performed numerical analysis and came up with a maximum wingspan of 3.75 meters (12.3 feet).”

“This is small for a Cretaceous pterosaur, but absolutely gigantic for a Jurassic one.”

“This fossil is particularly special as it is also one of the first records of this type of Jurassic pterosaur in the UK.”

“This specimen is currently the largest known Jurassic pterosaur in the world, surpassed only by a Swiss specimen, with an estimated wingspan of 5 metres (16.4 feet).”

“AbFab, as the Abingdon pterosaur is nicknamed, shows that pterodactyloides, the advanced pterosaurs that completely dominated the Cretaceous period, achieved astonishingly large sizes shortly after they first appeared in the Middle Jurassic, just as the ancestors of bird-like dinosaurs were beginning to take to the air,” said Dr Dave Unwin from the University of Leicester.

a paper The paper on the survey results is Proceedings of the Association of Geologists.

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James L. Etienne others“Giant” pterodactyloid pterosaur that lived in the Jurassic of Britain. Proceedings of the Association of GeologistsPublished online May 24, 2024, doi: 10.1016/j.pgeola.2024.05.002

Source: www.sci.news

Discovery of a previously unknown Jurassic Shuotheriid species illuminates early mammalian evolution

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In a new study, a team of paleontologists examined the structure of teeth. Feredkodon Chowi aims to better understand the phylogenetic relationships and evolutionary paths of a new species of Xuozalaid mammal that lived in what is now China during the Jurassic period.

rebuilding the life of Feredkodon Chowi (right) and Dianoconodon Yonggi (left). Image credit: Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences.

Professor Patricia Vickers-Rich, a researcher at Monash University and Museums Victoria, said: “Our study challenges current theory and provides a new perspective on the evolutionary history of mammals.”

“By describing the complex tooth shapes and occlusal patterns, we provide important insights into the phylogenetic relationships and evolutionary trajectory of the family Xenodiaceae, which was largely unknown until its recent discovery in China. ”

Shoeteraid a mammal-like animal from the Jurassic period, has baffled scientists because of its unique dental features.

These creatures have so-called pseudoclaws (basin-like structures) located in front of the triangular teeth of the mandibular molars, and the claws seen in modern therian mammals are similar to the triangular teeth of the lower molars. It is different from the claw-like pattern located at the back.

“This unique tooth pattern hinders our understanding of schootelid relationships and the first steps in the evolution of mammalian species,” Professor Vickersrich said.

Professor Vickers Rich and her colleagues examined the pseudotribosphene tooth of a new Jurassic schiotelid. Feredkodon Chowi represented by two skeletal specimens.

They were able to more completely dissect the tooth structure using a variety of analyses, and the results suggested that the tooth structure of schootherids is very similar to that of docodontans. Ta.

This study suggests that there are no true trigonids present in the basal teeth of Xuozalidae, indicating that they are more closely related to Docodontans than previously thought.

This reassessment of tooth structure not only resolves outstanding interpretations but also triggers a reconsideration of evolutionary connections within mammals.

“In 1982, a single small Jurassic mandible with four teeth was placed at a single point in the mammal family tree,” said Dr Thomas Rich, also from Monash University and Museums Victoria.

“We now have two virtually complete specimens analyzed in different ways, all of which place them in very different positions on the mammal family tree.”

“Additional specimens and different methods suggest different interpretations. Science often works like this.”

Based on new data, the Xuozidae appears to belong to a separate clade, the Docodontiformes, separate from the Auscutolibospheniformes, and are therefore grouped as follows: docodontance.

This finding highlights the importance of pseudotribosphenic characters in elucidating the initial diversification of mammals.

“This study highlights the presence of a huge variety of tooth morphologies in early mammals, demonstrating unique ecomorphological adaptations throughout the evolutionary development of mammals,” Professor Vickersrich said. Ta.

of findings Published in today's diary Nature.

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F. Mao other. The Jurassic family Xenotheliidae represents the earliest dental diversification of mammals. Nature, published online on April 3, 2024. doi: 10.1038/s41586-024-07258-7

Source: www.sci.news

‘Avatar’ and ‘Jurassic Park’ animatronics company collaborates with Boston Dynamics

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Since its inception as an MIT spinoff, Boston Dynamics systems have consistently provided entertainment value. The Hyundai-owned company has long embraced this by releasing dozens of highly viral videos over the decades.

However, with a few exceptions, entertainment was more of a side benefit than the ultimate goal. But that will change in the near future. just announced the deal A collaboration with Singapore-based entertainment brand Neon.

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Specifically (at least for our purposes) Neon is the parent company of Animax Designs. The Nashville-based company has created theme park and exhibit animatronics for some of Hollywood’s biggest franchises, including Avatar, Jurassic Park, Marvel, and Harry Potter.

No actual details have been revealed about the deal, other than the fact that it is “scheduled to culminate in late 2024 with an announcement that will captivate, inspire and surprise viewers.” Whether this means theme park robots or something else is completely unclear at this point.

A big advantage for Neon/Animax is that Boston Dynamics can produce robust, untethered autonomous systems at scale. The world of theme park robots has changed in recent years, with Disneyland’s Star Wars Galaxy’s Edge featuring robots that interact with park visitors.

“We are excited to collaborate with Neon and Animax on the development of a fully untethered entertainment robot,” Mark Thurman, Boston Dynamics’ chief strategy officer, said in a release. “These highly interactive creatures are poised to captivate consumers through novel and exciting initiatives. By partnering with Neon, a pioneer in immersive storytelling, we are proud to share our cutting-edge technology and the company’s ’s expertise in engaging storytelling.”

The agreement marks another step in Boston Dynamics’ commercialization roadmap, which began with Spot, a quadrupedal robot, and Stretch, a truck-unloading robot. But the company’s entertainment roots go back even further.mark lybert and team I also made a robot For the set of the 1993 Sean Connery/Wesley Snipes/Michael Crichton film Rising Sun.

Source: techcrunch.com