[16] In 1988, Paul maintained that segnosaurs were late surviving ornithischian-like prosauropods, and proposed a segnosaurian identity for Therizinosaurus. The team reinforced therizinosaur relationships, arguing that the teeth morphology of Eshanosaurus can be differentiated from sauropodomorphs. In 2005, paleontologists unearthed a fossil treasure trove in Utah, the remains of hundreds of previously unknown, medium-sized dinosaurs possessing long necks and long, clawed hands. Name: Erlikosaurus (Mongolian/Greek for "lizard king of the dead"); pronounced UR-lick-oh-SORE-us, Historical Period: Late Cretaceous (80 million years ago), Size and Weight: About 20 feet long and 500 pounds, Distinguishing Characteristics: Large size; large claws on front hands. Claire eventually managed to get far enough in the pond to fully submerge herself until the dinosaur left. 25 Facts About The Therizinosaurus - Dinosaur Facts For Kids They suggest its structure is somewhat similar to members of the oviraptorosaurs and therizinosauroids (whose most famous member is the huge pot-bellied Therizinosaurus). This species is extremely territorial, and will viciously attack anything within its territory. Therizinosaurus | Dinosaur Train Wiki | Fandom Its long, curved claws and unique adaptations for herbivory have made it one of the most unusual and interesting dinosaurs. Their unique hip bones, which pointed backwards and were partially fused together, initially reminded paleontologists of the "bird-hipped" ornithischians. All we know for sure about Martharaptor, named after the Utah Geological Survey's Martha Hayden, is that it was a theropod; the scattered fossils are too incomplete to allow a more conclusive identification, though evidence points to its being a therizinosaur. Name: Beipiaosaurus (Greek for "Beipiao lizard"); pronounced BAY-pee-ow-SORE-us, Historical Period: Early Cretaceous (125 million years ago), Size and Weight: About seven feet long and 75 pounds, Distinguishing Characteristics: Feathers; long claws on front hands; sauropod-like feet. In order to contain both N. brevispinus and N. bohlini they coined the Nanshiungosauridae family. "10 Facts About Therizinosaurus, the Reaping Lizard." According to Industrial Light and Magic's Sr. New therizinosaurid dinosaur from the marine Osoushinai - Nature What made this find especially significant is that Nothronychus was the first dinosaur of its kind, a therizinosaur, to be dug up outside Asia, which has prompted some quick thinking on the part of paleontologists. in 2001, as the clade containing all theropods more closely related to Therizinosaurus than to birds. Therizinosaurus lived in the Late Cretaceous period, meaning it would have shared the planet with other dinosaurs such as the Spinosaurus, Triceratops, Tyrannosaurus, and Velociraptor types. The generic name of this dinosaur, Therizinosaurus, is derived from the Greek term '' (therizo) which translates to cut, scythe, or reap. ThoughtCo, Feb. 16, 2021, thoughtco.com/therizinosaur-pictures-and-profiles-4043315. Its unique adaptations for herbivory and its bizarre appearance have also made it a popular subject of scientific and popular interest. Various features of the forelimbs, skull and pelvis unite these finds as both theropods and maniraptorans, close relatives to birds. Because it's represented by limited fossil remains, not much is known about Nanshiungosaurus besides the fact that it was a fairly large therizinosaur--the family of bizarre, bipedal, long-clawed theropods that may have pursued an omnivorous (or even strictly herbivorous) diet. Find out how it has changed and what the new tree reveals about dinosaurs' origins and evolution. Therizinosaurus | Fossil Wiki | Fandom Therizinosaurus - Wikipedia Its class is Attacker and it's limited to spawning in the Wetlands . Strauss, Bob. Continue with Recommended Cookies. An outdated historical depiction of a turtle-like Therizinosaurus. ThoughtCo. Bob Strauss is a science writer and the author of several books, including "The Big Book of What, How and Why" and "A Field Guide to the Dinosaurs of North America.". Therizinosauria - Wikipedia They belong to the theropod dinosaur group called maniraptors which also includes birds. Name: Nothronychus (Greek for "sloth claw"); pronounced no-throw-NIKE-us, Historical Period: Middle-Late Cretaceous (90 million years ago), Size and Weight: About 15 feet long and 1 ton, Distinguishing Characteristics: Long arms with long, curved claws; possibly feathers. The fact remains that no one really knows what this dinosaurs diet was like. For years, Deinocheirus was one of the most mysterious dinosaurs in the Mesozoic bestiary until the recent discovery of two new fossil specimens allowed paleontologists to finally unlock its secrets. 'Jurassic World Dominion' Therizinosaurus Dinosaur Serves 'Periodt [57], Dinosaur eggs with embryos of the Dendroolithidae type from the Nanchao Formation were identified as belonging to therizinosaurs based on anatomical features, and described by paleontologist Martin Kundrt and colleagues in 2007. With the appearance in the new movie more and more information is being requested about this scary looking, but not maybe so scary to meet, dinosaur. Therizinosaurs (once called segnosaurs) were large herbivorous theropod dinosaurs whose fossils have been found across the Middle Jurassic to Late Cretaceous deposits in Europe,[1] Asia and North America. [37], In 1998 Zhao Xijin and Xu Xing briefly discovered a partial lower jaw with teeth (IVPP V11579) from the Early Jurassic-aged Lufeng Formation in Yunnan, and concluded that this specimen represented the oldest known record of a coelurosaurian theropod. Additionally, it also shares closeness with Fukuivenator paradoxus, a dinosaur . The first genus, Therizinosaurus, was originally identified as a turtle when described from forelimb elements in 1954. Mongolia's Nemegt Formation provides a valuable snapshot of life during the late Cretaceous period, about 70 million years ago. It probably waddled a bit as it walked and moved slowly. Therizinosaurus | Natural History Museum Therizinosaurus lived during the late Cretaceous period 70 million years ago and was one of the largest and also the last of its family group, Therizinosauria. A Therizinosaurus was cloned by Biosyn and kept within Biosyn Sanctuary. Therizinosaurus ( / rznosrs /; meaning 'scythe lizard') is a genus of very large therizinosaurid that lived in Asia during the Late Cretaceous period in what is now the Nemegt Formation around 70 million years ago. (Of course, these claws may also have come in handy for intimidating predators like the eternally hungry Alioramus.). The model measures 15 cm tall and has an overall length of 19.5 cm. (2021, February 16). Dinosaur battle - DinoManiaSubscribe: http://www.youtube.com/channel/UCQq7b2VDc9pvKhIVkQsfuaQ?sub_confirmation=1 01 of 10 The Therizinosaurus was gray, with a red back and blue above its eyes. Even though representative fossils have only been found throughout Asia and North America, the range of Therizinosauridae is believed to have spanned much of the supercontinent of Laurasia based on several footprints . Therizinosaurus had a small head with a beaked mouth, atop a long neck. Their long necks, wide torsos, and hind feet with four toes used in walking resembled those of basal sauropodomorph dinosaurs. A frontal attack on an adult Therizinosaurus may not have ended well for this tyrannosaur as it did not have the type of vision for judging distance very precisely that was necessary to avoid being stabbed. He considered the common descent of these groups as support for the idea that dinosaurs were a monophyletic (natural) group, which was contested by some paleontologists at the time (who instead thought different dinosaurs groups evolved independently from thecodonts). [58][59], In a 2013 conference abstract, paleontologist Yoshitsugu Kobayashi and colleagues reported a nesting ground of theropod dinosaurs at the Javkhlant Formation, which contained at least 17 egg clutches from the same layer within an area of 22 m by 52 m. Each clutch contained 8 spherical eggs with rough surfaces which were in contact with each other and arranged in a circular structure without a central opening. Therizinosaurus Shared Its Territory with Deinocheirus. During the early phases of its discovery, it was assumed to be a species of an aquatic turtle. By Dhruv Sharma Published Sep 3, 2022 Here's why Jurassic World Dominion's Therizinosaurus literally turns a blind eye toward Claire and spares her, despite perceiving her as a threat. [8], In 1980, Barsbold and Perle named the new theropod infraorder Segnosauria, containing only Segnosauridae. [56], The cladogram below follows the extensive phylogenetic analysis of the Therizinosauria by Lindsay E. Zanno in 2010. These are perhaps the largest eggs of any animal ever found. Segnosaurus, scattered bones of which were discovered in Mongolia in 1979, has proven an elusive dinosaur to classify. Movie Features Is The Therizinosaurus Blind In Jurassic World Dominion? With broad hips and a pot belly, this dinosaur was perhaps the strangest-looking of all dinosaurs. Its closest relative was the slightly earlier therizinosaur Falcarius. The multiple clutches indicate that some therizinosaurs were colonial nesters, like hadrosaurs, prosauropods, titanosaurs, and birds, and the fact that they were found in a single stratigraphic layer suggests the dinosaurs nested at the site on a single occasion, and therefore did not exhibit site fidelity. The feeding habits of Therizinosaurus are still debated, but it was most probably an herbivore, using its big claws to push leaves into its mouth.Other hypotheses suggest that it was a termite eater, using its claws to open large termite nests - but it seems highly unlikely that an animal the size of Therizinosaurus could survive on a diet based on insects and features of the skull (including a beaked mouth and flattened teeth) suggest a herbivorous diet. To date, Falcarius is only the second therizinosaur to be discovered in North America, the first being the slightly bigger Nothronychus. The name of the representative genus, Therizinosaurus, is derived from the Greek (therz, 'to reap' or 'scythe')[6] and (saros, 'lizard'). An example of data being processed may be a unique identifier stored in a cookie. The importance of the central Asian Erliansaurus is that it's one of the most "basal" therizinosaurs yet identified; it was slightly smaller than Therizinosaurus, with a comparatively shorter neck, though it retained the oversized claws characteristic of the breed (these were used to harvest leaves, another odd adaptation of therizinosaurs, the only theropods known to have pursued herbivorous diets). In the same article, they named the new genus Erlikosaurus (known from a well-preserved skull and partial skeleton) which they tentatively considered a segnosaurid, and reported a partial pelvis of an undetermined segnosaurian, both from the same formation as Segnosaurus. We and our partners use cookies to Store and/or access information on a device. .mw-parser-output table.clade{border-spacing:0;margin:0;font-size:100%;line-height:100%;border-collapse:separate;width:auto}.mw-parser-output table.clade table.clade{width:100%;line-height:inherit}.mw-parser-output table.clade td.clade-label{min-width:0.2em;width:0.1em;padding:0 0.15em;vertical-align:bottom;text-align:center;border-left:1px solid;border-bottom:1px solid;white-space:nowrap}.mw-parser-output table.clade td.clade-label::before,.mw-parser-output table.clade td.clade-slabel::before{content:"\2060 "}.mw-parser-output table.clade td.clade-fixed-width{overflow:hidden;text-overflow:ellipsis}.mw-parser-output table.clade td.clade-fixed-width:hover{overflow:visible}.mw-parser-output table.clade td.clade-label.first{border-left:none;border-right:none}.mw-parser-output table.clade td.clade-label.reverse{border-left:none;border-right:1px solid}.mw-parser-output table.clade td.clade-slabel{padding:0 0.15em;vertical-align:top;text-align:center;border-left:1px solid;white-space:nowrap}.mw-parser-output table.clade td.clade-slabel:hover{overflow:visible}.mw-parser-output table.clade td.clade-slabel.last{border-left:none;border-right:none}.mw-parser-output table.clade td.clade-slabel.reverse{border-left:none;border-right:1px solid}.mw-parser-output table.clade td.clade-bar{vertical-align:middle;text-align:left;padding:0 0.5em;position:relative}.mw-parser-output table.clade td.clade-bar.reverse{text-align:right;position:relative}.mw-parser-output table.clade td.clade-leaf{border:0;padding:0;text-align:left}.mw-parser-output table.clade td.clade-leafR{border:0;padding:0;text-align:right}.mw-parser-output table.clade td.clade-leaf.reverse{text-align:right}.mw-parser-output table.clade:hover span.linkA{background-color:yellow}.mw-parser-output table.clade:hover span.linkB{background-color:green}, Below is the recently performed phylogenetic analysis performed by Hartman et al. Newly identified theropod dinosaur had strange hands - Phys.org The dinosaur at first failed to notice her due to its blindness, and moving instead to fatally swat a nearby deer it heard and begin grazing. (What were once known as "segnosaurs," a few decades ago, are now referred to as "therizinosaurs.") Name: Erliansaurus (Greek for "Erlian lizard"); pronounced UR-lee-an-SORE-us, Size and Weight: About 12 feet long and half a ton, Distinguishing Characteristics: Moderate size; long arms and neck; feathers. How Big Was The Therizinosaurus? - Dinosaur Facts For Kids ). [14], Paleontologist Gregory S. Paul concluded in 1984 that segnosaurs did not possess any theropodan features, but were instead derived, late-surviving Cretaceous prosauropods with adaptations similar to those of ornithischians. [19], In a 1990 review article, Barsbold and paleontologist Teresa Maryaska found Segnosauria to be a rare and aberrant group of saurischians, in an unresolved position among sauropodomorphs and theropods, probably closer to the former. Therizinosaurus was seen in Jurassic World: Dominion, its most notable moment was its face off against a Giganotosaurus, in which it lost one of its claws. Prosauropod Dinosaur Pictures and Profiles, Giant Mammal and Megafauna Pictures and Profiles, 10 Facts About Deinocheirus, the "Terrible Hand" Dinosaur, 10 Facts About Therizinosaurus, the Reaping Lizard, Top 10 Cutest Dinosaurs of the Mesozoic Era, Prehistoric Elephants: Pictures and Profiles, Duck-Billed Dinosaur Pictures and Profiles, Facts About Oviraptor, the Egg Thief Dinosaur. The recent discovery of several related dinosaurs - Alxasaurus in 1994 and Beipiaosaurus in 1999 - helped clarify the position of the therizinosaurs as a whole. The DNA of Therizinosaurus was used in the creation of the Indominus rex in Jurassic World.[1]. Measuring 10 meters long (32.8 feet), standing 5 meters tall (16.4 feet), and weighing 4,935kg (5.4 tons),[3] the cloned Therizinosaurus was skinnier than its real counterpart, and walked with a horizontal gate rather than a more vertical one. The most striking feature of Therizinosaurus was its clawssharp, curved, three-foot-long appendages that looked like they could easily disembowel a hungry raptor or even a good-sized tyrannosaur. Therizinosaurus shared its territory with dozens of other dinosaurs, including "dino-birds" like Avimimus and Conchoraptor, tyrannosaurs like Alioramus, and giant titanosaurs like Nemegtosaurus. In 1995, a study of one of these eggs conducted by the Mcgoverns and others revealed the bones of a tiny theropod, which possibly belong to a therizinosaur or a herbivore about which little is known. Analysis of these bones revealed something extraordinary: Falcarius, as the genus was soon named, was a theropod, technically a therizinosaur, that had evolved in the direction of a vegetarian lifestyle. Fun Therizinosaurus Dinosaur Facts for Kids This presumably feathered dinosaur had the big belly, small head, ridged teeth, and oversized front claws common to most therizinosaurs, a collection of traits that points to a herbivorous, or at least an omnivorous, diet (the claws were probably used for ripping and shredding vegetable matter rather than smaller dinosaurs). They therefore listed them as Saurischia sedis mutabilis ("position subject to change"). Additionally, in Jurassic World, Therizinosaurus appears as a feathered dinosaur. Subterraneously constructed nests are also indicative of a lack of parental care during the incubation period. The fossil baby was named "Baby Louie" after photographer Louie Psihoyos.[2]. Dinosaurs cartoons battles: Tarbosaurus vs Therizinosaurus - YouTube This worked well with the idea of giving the feathers an oily-looking irridencents. Akin to its real-life counterpart, it has immense strength in combat and is often found in groups in-game. This later, fertile flood plain supported a much larger variety of dinosaurs, including giant forms which were absent in the deserts. Not only are these the longest claws of any dinosaur (or reptile) yet identified, but they're the longest claws of any animal in the history of life on eartheven exceeding the gigantic digits of the closely related Deinocheirus, the "terrible hand. Therizinosaurus Pictures & Facts - The Dinosaur Database An alternate definition was given by Clark in 2004 (as the last common ancestor of Therizinosaurus and Beipiaosaurus and all its descendants), comprising a narrower group that excludes more primitive therizinosaurs, such as Falcarius, and allows the name Therizinosauria to remain in use for the larger group comprising all therizinosaurs. Therizinosaurus is a powerful herbivorous Tier 3 Theropod from the Late Cretaceous epoch. Most paleontologists lump this species in with Therizinosaurus as a (no surprise here) therizinosaur, based on its long claws and backward-facing pubic bones. Therizinosaurus | Dinosaur Arcade Wiki | Fandom When the first fossils of the Therizinosaurus were found, they mistakingly identified as the skeleton of a giant turtle. Therizinosaurus - Dinosaurs Encyclopedia - Dinoszaurusz Enciklopdia 01 of 10 Deinocheirus Was Once Known by its Huge Arms and Hands Based off of much research and data collected, it is found that this species had a strange addiction to plants. [44], Therizinosaurs spanned a large range of sizes, from the smaller Beipiaosaurus (2.2m (7.2ft) long)[26] and Jianchangosaurus (2m (6.6ft) long)[45] to the large-sized 67m (2023ft) long Segnosaurus and Suzhousaurus. [1], In 1979 Dong Zhiming named a new species of the megalosaurid Chilantaisaurus, C. zheziangensis, based on specimen ZhM V.001. Come face-to-face with some of the Museum's most famous dinosaurs. Therizinosaurus was a 30ft long dinosaur of the theropod family. The humble pigeon is a distant relative of the mighty T. rex. Therizinosaurus ('reaping lizard', from the Greek "therizo" meaning 'to reap' or 'to cut off' and "sauros" meaning 'lizard') was a very large therizinosaur (previously known as segnosaur). Beipiaosaurus appears to have been slightly brainier than its cousins (to judge by its slightly larger skull), and it's the only therizinosaur proven to have sported feathers, though it's highly probable that other genera did as well. [43], In 2012 the Mongolian Academy of Sciences recovered a partial theropod specimen from the Bayan Shireh Formation at the Urlibe Khudak (also Ulribe Khuduk) locality. It was added on June 13, 2022. With its three-foot-long claws, long, garish feathers and gangly, pot-bellied build, Therizinosaurus, the "reaping lizard," is one of the most bizarre dinosaurs ever identified. Also, studies have shown that the Therizinosaurs were actually Maniraptorans (not weird sauropods like they were thought to be when they were first discovered), due to the hip alignment of the creatures. All members of this group have long arms and therizinosaurs had hands equipped with the largest claws in the animal kingdom. Therizinosaurs were long considered an enigmatic group, whose mosaic of features resembling those of various different dinosaur groups, and scarcity of their fossils, led to controversy over their evolutionary relationships for decades after their initial discovery. He distinguished Segnosauridae from the theropod families Deinocheiridae and Therizinosauridae (then only known from the genera Deinocheirus and Therizinosaurus, both mainly represented by large forelimbs found in Mongolia) by features of their humeri and hand claws. The central Asian Deinocheirus was also endowed with huge, fierce-looking claws (hence its name, Greek for "terrible hand"), and it was in the same weight class as Therizinosaurus. These popular dinosaur reconstructions from the 1960s are no longer scientifically accurate. Therapods are dinosaurs that have hollow bones and three toes in each limb. Since the Erlikosaurus specimen lacked a pelvis, the authors were unsure if that of the undetermined segnosaurian could belong to it, in which case they would consider it part of a separate family. (At that time, the Gobi Desert wasn't quite as parched as it is today, and was able to support a sizable reptilian population). This unique adaptation allowed them to exploit a niche that was different from most other theropod dinosaurs, which were carnivorous. The Lost World: Jurassic Park Sega Gear game, Do Not Sell or Share My Personal Information. Therizinosaurus was first discovered in 1948 by a Soviet- Mongolian fossil expedition in Southwest Mongolia. Subsequent finds in northern China allowed paleontologists to assemble the general skeletal structure of the animal, which was determined to be a dinosaur and not a turtle. [33][38], The following taxonomy follows Zanno 2010, unless otherwise noted. Therizinosaurus appears in the PlayStation video game Dino Crisis. [9] Dong Zhiming went further, placing the segnosaurs in their own order, Segnosaurischia. [47], Therizinosaurs had a very distinctive, often confusing set of characteristics. When Rexy regained consciousness, the Giganotosaurus was unable to determine quickly enough which enemy was the greater threat, allowing Rexy to ram the Giganotosaurus onto the claws of Therizinosaurus, killing it. The Urlibe Khudak therizinosaur is most notably for its manual morphology which consist of only two fingers (didactyly), in a similar manner to tyrannosaurids. By then a wetter climate had replaced the deserts in which Velociraptor lived. As such, Therizinosaurus is the largest identified therizinosaur, and it weighed only a few tons less than the roughly contemporary Tyrannosaurus Rex of North America (which pursued a completely different lifestyle). Its fossils have been found in what is now modern-day Mongolia. Therizinosaurus | Jurassic World Evolution Wiki | Fandom These senses were also well-developed in earlier coelurosaurs and other theropods, indicating that therizinosaurs may have inherited many of these features from their carnivorous ancestors and used them for their specialized dietary purposes. [33] Hartman with colleagues in 2019 recovered "N." bohlini as a therizinosaurid in a clade joined by Segnosaurus and Nothronychus. As with other therizinosaurs, paleontologists speculate that Nothronychus used its long, curved claws much like a sloth, to climb trees and gather vegetation (although they're technically classified as theropods, the therizinosaurs seem to have been strict plant-eaters, or at the very least pursued omnivorous diets). However, additional information about this obscure, pot-bellied dinosaur--such as whether it sported primitive feathers--will have to await future fossil discoveries. Unable to outrun such a predator, Therizinosaurus would have stood its ground, towering over the tyrannosaur with metre-long claws ready to strike. Roarrr. Somewhat confusingly, Therizinosaurus has eclipsed Segnosaurus as the eponymous dinosaur of its "clade," or family of related genera. Manage Settings Like other therizinosaurs, Enigmosaurus was characterized by is large claws, feathers and bizarre, "Big Bird"-like appearance, but much about its lifestyle remains, well, an enigma. Given its extensive fossil remains, Falcarius has a lot to tell us about the evolution of theropods in general, and therizinosaurs in particular. [34] Barsbold and Maryanska in 1990 considered C. zheziangensis as a tentative segnosaur (later known as therizinosaurs) based on its relatively short and robust pedal phalanges and enlarged, strongly curved unguals, mostly similar to Segnosaurus. Therizinosaurus is a dinosaur which lived during the late Cretaceous Periodabout 77 million years ago. The therizinosaurs were some of the ungainliest-looking dinosaurs ever to roam the earth; paleo-illustrators have depicted them as looking like everything from mutant Big Birds to oddly proportioned Snuffleupagi. As a result, the Therizinosaurus would find its way through the sanctuary via echolocation, smell, and hearing. It is highly likely that Therizinosaurus was feathered, given that its close relative Beipiaosaurus certainly was. Unlike the case with some other Mongolian dinosaurs, we have no direct fossil evidence that Therizinosaurus was covered in feathersbut given its lifestyle, and its place in the theropod family tree, it likely had feathers during at least some part of its life cycle. It contains a single species, Therizinosaurus cheloniformis. Therizinosauridae (meaning 'scythe lizards') is a family of derived (advanced) therizinosauroid dinosaurs whose fossil remains have been found in mostly Late Cretaceous boundary. The Marine Reptiles of The Late Cretaceous, Nigersaurus (the dinosaur with 500 teeth! Therizinosaurs (once called segnosaurs) were large herbivorous theropod dinosaurs whose fossils have been found across the Middle Jurassic to Late Cretaceous deposits in Europe, [1] Asia and North America. Therizinosaurus was a bizarre-looking dinosaur, with long, curved claws that measured up to 3 feet (1 meter) in length. Name meaning Scythe lizard/reptile Diet Herbivore Height 5-6 meters (16-20 feet) Length 9-12 meters (30-40 feet) Weight 6 tons Location Asia (Mongolia, China) Range Isla Sorna Biosyn Sanctuary Time Late Cretaceous (Maastrichtian), 70 Ma Birth type Egg Strauss, Bob. In most respects, Neimongosaurus was a typical therizinosaur, if these bizarre, pot-bellied theropods can be described as "typical." Can you spot the errors? You can change your preferences at any time.. As fearsome as they looked, the prominent front claws of Alxasaurus were probably used for ripping and shredding plants, rather than other dinosaurs. [33], Therizinosauria is defined as Alxasaurus, Enigmosaurus, Erlikosaurus, Nanshiungosaurus, Segnosaurus, Therizinosaurus, and all taxa closer to them than to oviraptorosaurs, ornithomimids, and troodontids. Most theropods were powerful predators that chased after prey, killed it, and tore it apart with their sharp teeth and claws. Hand claw of Therizinosaurus (replica) Paleontologists are still trying to wrap their minds around therizinosaurs, the family of tall, pot-bellied, long-clawed, and (mostly) plant-eating theropods of late Cretaceous North America and Asia. The largest claw was on the first digit. The cross-section of the shaft is triangular as in Therizinosaurus, whereas it is oval in Falcarius 22. tashuikouensis. Name: Jianchangosaurus (Greek for "Jianchang lizard"); pronounced jee-ON-chang-oh-SORE-us, Size and Weight: About 6-7 feet long and 150-200 pounds, Distinguishing Characteristics: Small size; bipedal posture; feathers. Therizinosaurus is an extinct genus of the therizinosaurid family that lived in Mongolia during the Late Cretaceous period around 70 million years ago. [20] In 1993, paleontologists Dale A. Russell and Dong Zhi-Ming described the new genus Alxasaurus from China, at the time the most complete large theropod from its time and place. Its two foot long claws are some of the biggest claws ever found on any animal. Where did the meteor that killed the Dinosaurs land ? This bipedal theropod likely used its long front claws as scythes, mowing down vegetation, stuffing it into its narrow mouth, and digesting it in its large, distended stomach (since herbivorous dinosaurs required copious amounts of intestines to process tough plant matter). [10], In 1982, Perle reported hindlimb fragments similar to those of Segnosaurus, and assigned them to Therizinosaurus, whose forelimbs had been found in almost the same location.

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