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New Troodontid Dinosaur with Thick Skull Discovered in Mexico

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A groundbreaking study by a team of paleontologists from Mexico and the United States has unveiled a new species of bird-like dinosaur, Xenovenator Espinosai, notable for its exceptionally thick, dome-shaped skull. This unique adaptation suggests it may have engaged in headbutting behaviors during conflicts with its peers.

Reconstruction of the life of Xenovenator Espinosai. Image credit: Connor Ashbridge / CC BY 4.0.

This newly identified dinosaur species thrived during the late Cretaceous period, approximately 73 million years ago.

Xenovenator Espinosai is part of the Troodontidae family, which includes agile theropod dinosaurs closely related to modern birds.

The holotype and paratype specimens were uncovered during surface sampling in the Cerro del Pueblo Formation located in Coahuila state, northern Mexico, in the early 2000s.

While Troodontids are recognized for their larger brains and heightened sensory capabilities, this species distinguishes itself through an exceptionally thick skull roof.

The holotype specimen retains nearly the entire brain case, showcasing a strongly dome-shaped structure that reaches thicknesses of up to 1.2 cm.

CT scans reveal that the skull features a dense architecture with closely interlocked sutures and a rugged, textured exterior.

This structural resemblance to the reinforced skulls of dome-headed pachycephalosaurs highlights an evolutionary adaptation for intraspecific combat, particularly head-butting.

While display structures and combat weapons are common among many dinosaur species, detailed adaptations for fighting have yet to be recorded in non-avian maniraptoran theropods.

The paratype specimen of Xenovenator Espinosai shows less pronounced cranial thickening, which may indicate variability due to age or sex, suggesting that the most significant skull enhancements occurred later in development or were selective to one sex.

“The thickened, deformed skull of Xenovenator Espinosai is unparalleled among maniraptorans, with its precise function remaining unclear,” stated lead author Dr. Hector Rivera Silva from Museo del Desierto.

“Several traits that appear to serve no obvious survival advantage, such as cranial horns and crests, may be the result of sexual selection.”

“In contemporary mammals and birds, these attributes can be utilized for display or as weapons during courtship.”

“Considering our findings—skull thickening, cranial doming, and intricate sutures—it is likely that the domed skull of Xenovenator Espinosai was an adaptation for intraspecific combat,” they added.

This discovery marks the first documented case of a parabird exhibiting a specialized skull for combat among its species.

Interestingly, researchers noted that wrinkled frontal bones and similar features in the maxilla and nasal bones of troodontids may suggest widespread intraspecific fighting, with heightened intensity observed in Xenovenator Espinosai.

The phylogenetic analysis indicates that despite being part of a larger North American troodontid lineage, Xenovenator Espinosai’s distinctively thick, domed skull highlights its unique evolutionary niche within the group.

The recurrent evolution of intricate display features and weapons during the Cretaceous hints at the increasing importance of sexual selection in dinosaur evolution.

This finding enriches our understanding of the diversity among troodontid dinosaurs from southern Laramidia, offering rare insights into how even smaller, lighter theropods developed traits specialized for physical confrontation.

Researchers propose that related species like Xenovenator Robustus signify a distinct clade of heavily built troodontids endemic to the Southwest, emphasizing the uniqueness and diversity of southern Laramidian fauna.

“Sexual selection, encompassing adaptations for display and combat, was likely a pervasive phenomenon among dinosaurs during the Late Cretaceous period,” they concluded.

For further details on this discovery, refer to the research paper published in the journal Diversity.

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Hector E. Rivera-Silva et al. 2026. A troodontid theropod with a thick skull that lived in late Cretaceous Mexico. Diversity 18(1):38; doi: 10.3390/d18010038

Source: www.sci.news

The Venice Biennale: A Magical Island Inspired by Mexico

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Small urban farms in Mexico City, referred to as Chinampas, employ a distinctive farming technique. Rather than transporting water to the land, Chinampas bring the land into the water.

Dating back over 1,000 years, the Chinampas were developed by Aztec farmers who constructed rectangular plots on expansive lakes to cultivate food for Tenochitlan. At one time, tens of thousands of these plots existed, organized in precise grids with narrow canals between them; however, many were damaged or abandoned after Hernan Cortes and his Spanish troops changed the region’s civil structure in 1521.

Yet, the Chinampas in Xochimilco continue to thrive in South Mexico City, despite pressures from developers and competition with industrial farms. The sustainable farming methods are gaining renewed interest amid the challenges of climate change and prolonged drought.

Could other regions around the globe adopt the concept of “floating islands,” as these fields are sometimes termed? A group of Mexican designers, landscapers, and farmers believes that this ancient technology could be adapted widely. They aim to replicate the Chinampas for their country’s pavilion at this year’s Venice Architectural Biennale.

“Chinampas boast a simple, clever design that has emerged collectively, benefiting not just people but all surrounding life,” remarked Lucio Usobia, who has dedicated the last 15 years to preserving the remaining Chinampas through his nonprofit, Arca Tierra.

The Mexican pavilion aligns perfectly with the major exhibition “Intelligent. Natural. Artificial.” The Chinampas are both artificial and organic, thriving only when there’s a close gaze on the rows of corn and inhabited plots, alongside farmers, policymakers, and tourists embarking on popular canoe tours.

Promoting the Chinampas as an eco-friendly design inspiration was an obvious choice for the Biennale, the team members stated. “Venice, built on water, shares vulnerabilities with Xochimilco,” mentioned Ana Paula Ruiz Galindo, the founder of the design company Pedro y Juana.

They highlighted that Venice and Xochimilco were both designated as UNESCO World Heritage Sites in the same year, 1987, and that both places are waterborne communities where boats navigate, striving to balance tourism’s benefits and drawbacks.

Venice boasts its iconic gondolas, while Xochimilco features brightly decorated flat boats, known as trajineras, which take visitors on festive rides. Both types of boats are maneuvered by pilots using long poles.

Creating a replica of the Chinampas on-site required imagination and compromise.

The Aztecs methodically built the islands over time using branches and reeds to establish borders at the bottom. This allowed for layered sediment and decomposed vegetation to accumulate until the islands emerged above the water’s surface for cultivation. In addition to crops like corn, beans, and squash, traditional agricultural methods known as milpas are also utilized to naturally enrich soil nutrients by planting trees at the island’s corners.

The Mexican pavilion is situated in the Biennale’s Arsenale complex, featuring a scaled-down version at a mere fraction of the typical 500 square meters (0.12 acres) of a traditional Chinampa. A video produced in Mexico City, showcasing authentic Chinamperos, enhances the exhibition, complemented by bleacher seating along the walls. Artificial light simulates sunlight for the plants.

At the center lies a functional garden filled with vegetables, flowers, and herbs. (The plants originated from Italian nurseries and were transported by boat to the Arsenale in mid-April.) They will be in full bloom during the Biennale, which runs until November 23rd.

“By the end of the Biennale, we can harvest corn and make tortillas,” Usobia shared. “Before that, we can gather beans, squash, tomatoes, and chili.”

Visitors will have a chance to learn about unique seed cultivation techniques specific to Chinampas and even plant their seedlings by themselves.

Acknowledging local agricultural practices, Chinampas will also incorporate a version of Vite Maritata, an ancient Etruscan method that involves planting grapes alongside trees, thus creating a natural trellis system for the grapes. The exhibition team is investigating the synergy between these two agricultural immersion methods, blending trees and crops into a cohesive ecosystem.

“We observe a dialogue between these ancient cultures and discuss how we can progress,” noted Usobia.

The exhibition team emphasized their intention to avoid overly romanticizing the Chinampas, acknowledging the challenges of scaling practices to feed today’s population. The farms thrive in Mexico City because they are situated in a lake, allowing for manageable water control levels. In contrast, Venice, located in a lagoon adjacent to the sea, faces constant threats from flooding.

Additionally, the economics of small farms are challenging, with high production costs and low yields making profitability difficult. Many farmworkers receive inadequate wages and the repetitive nature of planting and harvesting jobs has diminished their appeal.

“This is a significant concern here. Young people, in particular, are less inclined to work on Chinampa farms,” stated Maria Maria de Buen, the graphic designer for the team.

Indeed, many Chinampas in Xochimilco lie fallow as their owners struggle to make a living. Some have been repurposed into soccer fields for community rental, while others serve as venues for events like weddings and birthday parties. Despite official restrictions against development, cattle grazing, and hunting for endangered species, such activities occur frequently.

Still, the team perceives the crucial connection between nature and urban development, advocating for the integration of existing water resources within residential and educational spaces as essential inspiration. Architects visiting the Biennale may not be able to design extensive agricultural landscapes, but they can adapt existing conditions to replicate ideas on a smaller scale, suggested Jachen Schleich, principal of the Mexico City architectural firm Dellekamp + Schleich.

“If someone executes this in their backyard, they could at least feed their family, or the people on the fourth floor of their building. It could serve as a micro-intervention in a landscape or public space.”

Source: www.nytimes.com

Amazing Fireballs Light Up the Sky in Mexico City, Sparking Awe and Memes Galore

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Bright objects falling from space lit up the sky in the Mexican capital around 3am on Wednesday, spreading over plains, volcanoes, and small towns.

Videos of a fireball that streaked across a Latin American country and exploded into a burst of light in Mexico City captured the attention of many.

“No, the meteorite that exploded last night is not a reason to reach out to your ex,” someone tweeted. Meteor shower.

Soon, the internet was filled with edited images of fireballs featuring cartoon characters and political jokes.

Bright objects illuminate the sky in Mexico City early on Wednesday.webcamsmx via AP

Mexican scientists quickly realized that the object streaking across the sky was not a meteorite but a bolido. This was Bolido.

Bolido, as defined by NASA, is “a very bright meteor that is spectacular enough to be seen over a large area.”

Mario Rodriguez, a space science researcher at the National Autonomous University of Mexico, explained that it could be classified as a meteor or a fragment of one.

Bolido, resembling a shooting star, creates a fire as it descends through the Mexican skies in the early hours of Wednesday.

“Due to the high pressure on the object, they begin to flare up with their trailing tails and emit light,” Rodriguez stated, part of a team of scientists analyzing the video that amazed many Mexicans. He added that unlike meteorites impacting the Earth, bolidos disintegrate in the atmosphere.

According to him, this particular meteor was around five feet long and posed no danger to the public.

Source: www.nbcnews.com

Long-Held Ostrich-Like Dinosaur Unearthed in Mexico

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The fossilized archaeological site discovered in Mexico’s core wilderness in 2014 has identified the strange new genus and species of the Ornithomimid dinosaur.

Reconstruction of life Mexidracon Longimanus. Image credit: ddinodan / cc by 4.0.

The newly identified dinosaur species walked around the earth about 73 million years ago in the late Cretaceous era.

It was named Mexidracon Longimanus. The length of this ancient creature was about 3 m (10 feet).

It belongs to Ornithomimidae, a dinosaur family that evolved a beak without teeth, is omnivorous or herbivorous, and likely resembled a superficial ostrich.

“Ornithomimosaurs have a large orbit, long neck, non-radical manus, long rostral bones with a slender, long, and distally delicate skull of the beast legs resembling a dinosaur,” said Benemerita Escuela Normal Deco Aria and her colleagues in the United States, Mexico, and Spain.

“The size of the body ranges from small forms (exceeding 12 kg) like Nqwebasaurus Thwazi and Blue Weather from early Cretaceous in Africa and Asia to large Asian species in the late Cretaceous like Deinocheirus Mirificus (6 tons).

“Ornithomimosaurs are known from the Caucasian strata in Europe, Asia, North America, and Africa.”

The fossil of Mexidracon Longimanus was discovered in 2014 in the Cerro del Pueblo Formation in Mexico.

“The Cerro del Pueblo layer of Core Wayla represents one of the richest layers, including Mexican dinosaurs,” said researchers.

“Similar to other Cretaceous sites in North America and Asia, Ornithomimosaurs are very common in the Cerro del Pueblo layer.

“However, most of these specimens are very fragmentary, and even relatively complete specimens remain officially unexplained.”

“Mexidracon Longimanus represents the first officially described ornithomimid dinosaur species from the Cerro del Pueblo layer.”

Its most prominent autoapomorphy is the extreme elongation of its manual phalanges, forming the palm of its hand.

“The discovery of Mexidracon Longimanus suggests a wide body size diversity and geographical distribution of ornithomimosaurs among the Campanians in southern Laramidia.

“The record of ornithomimosaurs in the Cerro del Pueblo layer is another example of the coexistence of ornithomimids and Deinocheirids, reaching a wide body size diversity in this ‘ostrich’ dinosaur clay.”

The discovery of Mexidracon Longimanus will be reported in a paper released in the journal “Cretaceous Research” this week.

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Claudiainéssserrano-Breweryas et al. Mexico, Core Wayla Campanians (Upper Cretaceous). A new long ornithomimid dinosaur from the Cerro del Pueblo layer. Cretaceous Research was released online on January 28, 2025. Doi: 10.1016/J.CRETRES.2025.106087

Source: www.sci.news

Scientists remain uncertain about the inhabitants of the massive sinkhole in Mexico

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The deepest blue hole in the world, also known as an ocean sinkhole, can be found off the coast of Mexico’s Yucatan Peninsula. It plunges to a depth of at least 420 meters (1,378 feet), remaining unexplored by researchers.

Local divers discovered the lake, named “Ta’am Dja” or “Deep Sea” in Mayan, over two decades ago. In 2021, scientists attempted to measure its depth using an echo sounder, estimating it to be 275 meters (902 feet). However, a later expedition in 2023 employed a device called a conductivity, temperature, and depth (CTD) profiler, revealing a depth of 420 meters (1,378 feet) without reaching the bottom.

https://c02.purpledshub.com/uploads/sites/41/2025/01/blue-zones.mp4
Aerial view of the Great Blue Hole

Blue holes are naturally formed vertical-walled caves on the ocean floor, typically found in coastal regions with soluble rock formations like limestone. These geological formations may reach only a few tens of meters in depth and could be interconnected with underwater cave systems.

Due to poor water circulation, blue holes lack oxygen in their depths, posing challenges for organisms. Some microorganisms thrive in these conditions by consuming sulfur-based compounds like hydrogen sulfide. Additionally, creatures such as foraminifera and nematodes have been discovered living in blue holes, prompting further exploration to unveil the mysteries of Ta’am Dja’s deep blue waters.

This article (by Preston Levy of Norwich) addresses the question, “What are Mexican Blue Holes?”

To submit inquiries, contact questions@sciencefocus.com or message us via our Facebook, ×, or Instagram Page (please include your name and location).

For more intriguing science content, visit our Ultimate Fun Facts page.

read more:

Source: www.sciencefocus.com

Unearthed: Laser Technology Discovers Hidden Mayan City with Stone Pyramids in Mexico

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Archaeologists used a laser-based detection system to discover more than 6,500 Pre-Hispanic structures in Campeche, Mexico, including a previously unknown Mayan city named Valeriana.

Details of the main ruins of Valeriana in Campeche, Mexico. Image credit: Auld-Thomas others., doi: 10.15184/aqy.2024.148.

“Our analysis not only revealed a complete picture of densely populated areas, but also revealed a lot of variation,” said Tulane University doctoral student and Northern Arizona University professor. Lecturer Luke Old-Thomas said.

“What we found was not only rural areas and small settlements, but also a town where people had long been actively farming amidst the ruins, right next to the only main road in the area. We also found a large city with pyramids.”

“The government knew nothing about it. The scientific community knew nothing about it.”

“This is an exclamation point after the statement that, no, we haven't discovered everything. Yes, there's still a lot to discover.”

lidar technology It uses laser pulses to measure distance and create a 3D model of a specific area.

This allows scientists to scan vast tracts of land from the comfort of their computer labs, discovering anomalies in the landscape that turn out to be pyramids, family homes, and other examples of Mayan infrastructure. It's done.

“With LIDAR, we can map large areas very quickly and with very high accuracy and level of detail, so we can say, “Wow, there are so many buildings that we don't know about, and they must have a large population.'' ‘It's huge,’ said Old Thomas.

“The counterargument was that lidar surveys were still too constrained to known large sites like Tikal, thus creating a distorted picture of the Maya lowlands.”

“What if the rest of the Maya region is much more rural and what we've mapped so far is the exception rather than the rule?”

The team's results provide compelling evidence of a Maya landscape that was more complex and diverse than previously thought.

“Rider teaches us that, like many other ancient civilizations, the Lowland Maya built a diverse tapestry of towns and communities on a tropical landscape,” said Marcello Canuto, a professor at Tulane University. “I'm grateful for that,” he said.

“Some areas have vast expanses of farmland and are densely populated, while others have only small communities.”

“Nevertheless, we can now see how much the ancient Maya modified their environment to support a long-lasting and complex society.”

a paper The findings were published in the journal October 29, 2024. ancient.

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luke old-thomas others. 2024. Running out of space: Environmental riders and the crowded ancient landscape of Campeche, Mexico. ancient 98 (401): 1340-1358;doi: 10.15184/aqy.2024.148

Source: www.sci.news

Mexico reveals newly discovered duck-billed dinosaur

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Palaeontologists from the University of Bath and elsewhere have described a new genus and species of kritosaurine hadrosaur dinosaur from a partial skull discovered in the Late Cretaceous Cerro del Pueblo Formation.

Reconstructing your life Coahuilasaurus lipani. Image credit: C. Diaz Frias.

The newly described species is Coahuilasaurus lipani. It has an estimated overall length of 8 metres (26.2 ft).

It dates back about 72.5 million years ago, towards the end of the Campanian stage of the Late Cretaceous Period.

Coahuilasaurus lipani belongs to Kritosaurs, a unique family of duck-billed dinosaurs (Hadrosauridae), Kritosaurus navajovius and their relatives.

“Kritosaurus is one of the most diverse lineages of North American hadrosaurs, represented by numerous species that lived during the Late Cretaceous of the Western Interior,” they said. Dr Nicholas Longrich Researchers from the University of Bath and their colleagues.

“The striking changes in jaw morphology suggest different ecological niches and dietary specialization.”

“The diversity of cranial vault morphology among kritosaurs suggests that sexual selection may have driven the evolution of kritosaurs, similar to the crested lambeosaurs and ceratopsids.”

“Although klitosaurins’ bone protuberances are not very sophisticated, klitosaurins may have had sophisticated soft-tissue structures.”

“The function of the Kritosaurus crest is unclear,” the paleontologist said.

“Because it is conspicuous, it probably functioned as a display. In modern birds, skull ornaments are sometimes used in intraspecific combat, for example in hornbills, and the relatively robust crest feathers may have served a similar function.”

“As in lambeosaurids, the elaborate nasal cavity may have also been involved in vocalization.”

Part of a skull Coahuilasaurus lipani comes from the Cerro del Pueblo Formation in Coahuila, Mexico.

“The Cerro del Pueblo Formation harbors a diverse assemblage of dinosaurs, including theropods and ornithischians,” the researchers said.

“Theropods include tyrannosaurs and deinocheirs. Paraxenisaurus normalensis, Ornithomimidae, Caenagnatidae, Dromaeosauridae, and Troodontidae.”

“The ornithischian family includes ankylosaurs, ceratopsids, thescelosaurs, and hadrosaurs.”

According to the team’s analysis, Coahuilasaurus lipani is distinct from the kritosaurs found further north on Laramidia.

It may be related to the kritosaurid hadrosaurids, Gryposaurus monumentensis. This suggests that it is part of a distinct southern kritosaur lineage.

“With specimens from the Naashoibito Formation of the Kirtland Formation in New Mexico, Coahuilasaurus lipani ,”This study shows that kritosaurs survived in the south of Laramidia after local extinction in the north, a pattern also seen in parasaurolophus and lambeosaurines,” the scientists said.

“The southern fauna not only has different species but also different patterns of diversity change compared to the northern Laramidia fauna.”

“Differences in species composition and community structure in different regions of Laramidia mean that further studies on dinosaurs from Mexico and the southwestern United States are needed to understand the evolution of dinosaur diversity in western North America.”

“Southern dinosaur faunas may have been characterized by higher origination rates and lower extinction rates than northern faunas.”

of study Published in the journal on September 1, 2024 Diversity.

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Nicholas R. Longrich others2024. Coahuilasaurus lipania new species of kritosaurine hadrosaurid from the Upper Campanian Cerro del Pueblo Formation, northern Mexico. Diversity 16 (9): 531; doi: 10.3390/d16090531

Source: www.sci.news

Hot Gulf of Mexico experiences unusually calm hurricane season

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summary

  • Despite warm ocean temperatures, hurricane season is on a lull.
  • This season is expected to be much more active than usual and is off to a record-breaking start.
  • Still, the unofficial peak of hurricane season is on September 10, so scientists wouldn’t be surprised if cyclonic activity picks up again soon.

The Gulf of Mexico is scorching hot, but hurricane season is on a lull (at least temporarily) — a surprise to researchers who say there’s a lot brewing in the Atlantic, but no storms are showing up on radar.

The National Hurricane Center said on Friday No tropical cyclone activity expected for at least a week.

“Nothing is happening, which is extremely quiet and odd given the warm temperatures in the Atlantic and the La Niña climate pattern,” said Philip Klotzbach, a meteorologist at Colorado State University who specializes in seasonal hurricane forecasting in the Atlantic basin. “It’s a head-scratching situation right now.”

The La Niña weather phenomenon that scientists are predicting will develop this fall is closely linked to hurricanes, as is warming water in the Atlantic Ocean, with ocean heat content in the Gulf of Mexico at its highest since 2013, according to data from the University of Miami.

Sea surface temperatures in the North Atlantic are trending about 1.8 degrees above normal. According to the University of Maine’s Climate Reanalysis InstrumentThis trend is especially evident in the Gulf of Mexico.

Warmer oceans increase hurricane energy through heat, increasing the risk of storms intensifying rapidly.

“We have plenty of fuel. It’s not going to hinder our season,” Klotzbach said.

Hurricane season begins on June 1 and ends on November 30. Hurricane scientists had predicted this year’s hurricane season would be record-breaking, but it got off to a record-breaking start in June with Hurricane Beryl being the first Category 4 storm to form in the Atlantic. Then, the slow-moving Hurricane Debbie dumped incredible rain on several southeastern states in early August. But since then, it’s been relatively quiet.

Steve Bowen, chief scientific officer at global reinsurance broker Gallagher Re, said weather trends off the coast of West Africa, including a strengthening monsoon, may have prevented tropical storms from developing in the Atlantic basin.

But that may not last long: The unofficial peak of hurricane season is September 10.

“I wouldn’t be surprised if we get what’s called a backloading season with pretty good activity through September, October, and possibly November,” Bowen said.

Although things have calmed down recently, scientists believe this season has been quite active so far.

“We’ve already had two landfalls in the United States,” Bowen said. “Typically, the first major hurricane doesn’t form until August 31st. … Just looking at the statistics, we’re well ahead of normal.”

Source: www.nbcnews.com

Severe Water Shortages Plague Mexico City’s 21 Million Residents

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The ancient relationship between Mexico City and water dates back to the city’s origins. Situated on a former lakebed that was drained after the Spanish conquest in the 16th century, the city now relies on underground aquifers and a network of canals, dams, and reservoirs from the Kutsamara water system for its main water supply.

Approximately 70% of the city’s water comes from underground sources, with the remaining 30% supplied by the Cuzamara system to the Mexico City metropolitan area and the Toluca Valley. However, increasing urbanization and overuse of aquifers have led to land subsidence, causing the city to sink at a rate of about 20 inches per year since 1950 due to continued groundwater extraction.

Despite efforts to repair and upgrade aging infrastructure, Mexico City’s water system struggles to keep pace with the demands of a rapidly growing population. Climate change further exacerbates the water crisis, with persistent drought and rising temperatures leading to decreased precipitation and limited water replenishment for aquifers and dams.

This water scarcity crisis has sparked protests and unrest among residents, with many areas facing severe water shortages. Efforts to conserve water and prioritize its usage have been urged by local authorities, as communities like Iztapalapa struggle to cope with limited water access.

For residents like Hernández Villa, conserving water has become a daily challenge, with measures like reducing laundry frequency and bathing in containers to stretch their limited water supply. The urgent need for sustainable water management and infrastructure upgrades is evident, as Mexico City grapples with a worsening water crisis.

Dennis Chou reported from New York City and Alvinson Linares from Mexico City.

Source: www.nbcnews.com

Huge new tyrannosaurus rex found in New Mexico

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discovery of Tyrannosaurus macraiensissister species of the famous one tyrannosaurus rexsuggests that tyrannosaurid dinosaurs originated from Laramidia, an island continent that existed between 100 million and 66 million years ago and stretched from present-day Alaska to Mexico.

rebuilding the life of Tyrannosaurus McClain. Image credit: Sergey Krasovskiy.

“Tyrannosaur dinosaurs were the dominant predators of North America and Asia during the Late Cretaceous period,” said Dr. Sebastian Dalman of the New Mexico Museum of Natural History and Science and his colleagues.

“Evolved from a diminutive ancestor in the mid-Cretaceous period, became an apex predator in the late Cretaceous period, and eventually tyrannosaurus”

“tyrannosaurusWith a sturdy skeleton and powerful bone-crushing jaws, this animal was the dominant carnivore of the late Maastrichtian period in western North America. ”

“Grows up to 12 meters long and weighs 10 tons, tyrannosaurus It was the largest terrestrial predator of its time, and perhaps of all time. ”

“where and when Tyrannosaurini (tyrannosaurus and relatives) origin remains unknown. Competing hypotheses place its origin in Asia or western North America (Laramidia). ”

The newly identified species is Tyrannosaurus McClainlived in what is now the United States 71 million to 73 million years ago, or 5 million to 7 million years ago. tyrannosaurus.

The fossilized partial skull of this dinosaur was discovered in the Hall Lake Formation in New Mexico.

Although the specimens were initially assigned; tyrannosaurus and its size is tyrannosaurusPaleontologists have proposed that the specimen belongs to a new species, due to several subtle differences in the shape and joints between the specimen and the skull. tyrannosaurus.

Analysis of the relationship between Tyrannosaurus McClain and other theropod dinosaur species. Tyrannosaurus McClain It may have been a sister species of tyrannosaurusmaking it the closest known relative. tyrannosaurus.

The authors suggest that Tyrannosaurini may have originated in southern Laramidia, an island continent that existed between 100 million and 66 million years ago and stretched from present-day Alaska to Mexico.

Additionally, Tyrannosaurus, along with other giant dinosaurs of southern Laramidia such as ceratopsians, hadrosaurs and titanosaurs, may have evolved to large body sizes by about 72 million years ago, the researchers say. is suggesting.

They speculate that the evolution of giant tyrannosaurines may have been driven by the enormous body size of the herbivores they preyed on in southern Laramidia.

“The evolution of giant tyrannosaurs in southern North America suggests that large dinosaurs evolved at lower latitudes in North America, along with giant ceratopsians, hadrosaurs, and titanosaurs.” said.

of study It was published in the magazine scientific report.

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SG Dalman other. 2023. Giant tyrannosaurs that lived in southern North America from the Campanian to the Maastrichtian and the evolution of giant tyrannosaurids. science officer 13, 22124; doi: 10.1038/s41598-023-47011-0

Source: www.sci.news

Acapulco, Mexico braces as Hurricane Otis rapidly intensifies into a perilous Category 5 storm

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ACAPULCO, Mexico — Hurricane Otis intensified from a tropical storm to a dangerous Category 5 hurricane rapidly as it made its way towards Mexico’s South Pacific coast on Tuesday, ultimately making landfall near the resort town of Acapulco early Wednesday. The potential for devastating damage was predicted.

According to the National Hurricane Center, Otis had maximum sustained wind speeds of 160 mph by late Tuesday. It was located about 55 miles south-southeast of Acapulco and moving north-northwest at a speed of 9 mph.

A hurricane warning was in effect from Punta Maldonado to Zihuatanejo, with a hurricane watch in effect from Lagunas de Chacahua to Punta Maldonado.

Otis is expected to maintain its Category 5 hurricane strength until it reaches land, but it is anticipated to rapidly weaken thereafter due to Mexico’s mountainous region. Otis is forecasted to dissipate over southern Mexico on Wednesday night.

As rain began to fall and winds increased, people in Acapulco hurried home and tourists were forced to leave the beaches.

The state government of Guerrero announced the preparation of 396 evacuation centers to accommodate families affected by wind damage and rising waters.

The Mexican Army and Navy have deployed over 8,000 troops equipped with specialized equipment to aid in the rescue operations. The port of Acapulco, where approximately 300 fishing boats are docked, has been closed by the authorities.

Otis is expected to bring 5 to 10 inches of rainfall to Guerrero, with certain areas possibly experiencing up to 15 inches. This raises concerns about landslides and flash floods in Guerrero’s steep mountains.

In the Atlantic Ocean, hurricane tammy After passing through the Lesser Antilles over the weekend, it continued northeast over open ocean with winds of 115 mph. Tammy was located approximately 925 miles south-southeast of Bermuda. The storm is expected to weaken by Thursday, according to the U.S. National Hurricane Center.

Source: www.nbcnews.com