mesonychids limbs and tail description

However, as the order is also renamed for Mesonyx, the term "mesonychid" is now used to refer to members of the entire order Mesonychia and the species of other families within it, such as the triisodontid mesonychid, Andrewsarchus, which is, coincidentally, probably the most well-known member of the entire order. Ambulocetus is among the best-studied of Eocene Mesonychids possess unusual triangular molar teeth that are similar to those of Cetacea (whales and dolphins), especially those of the archaeocetes, as well as having similar skull anatomies and other morphologic traits. homestead high school staff. 353-378. A few experts unite Mesonychia with the whales to form the clade "Cete." Habitat: Shores of Pakistan and India. With a short lower spine stiffened by revolute joints, they would have run with stiff backs like modern ungulates rather than bounding or loping with flexible spines like modern Carnivorans. Based on the skull sizes of Pakicetus specimens, and to a lesser extent on composite skeletons, species of Pakicetus are thought to have been 1 to 2 meters in length (4 to 5 feet). Mesonychids have often been reconstructed as resembling wolves albeit superficially, but they would have appeared very different in life. The fossil remains of such a creature remained elusive. However, as the order is also renamed for Mesonyx, the term "mesonychid" is now used to refer to members of the entire order Mesonychia and the species of other families within it. Riley Black is a freelance science writer specializing in evolution, paleontology and natural history who blogs regularly for Scientific American. Some members of the group are known only from skulls and jaws, or have fragmentary postcranial remains. They first appeared in the Early Paleocene and went into a sharp decline at the end of the Eocene and died out entirely when the last genus, Mongolestes became extinct in the Early Oligocene. Terms of Use J. G. M. Thewissen, S. T. Hussain, and M. Arif, Fossil Evidence for the Origin of Aquatic Locomotion in Archaeocete Whales, Science 263 (1994): 210-12. The molars were laterally compressed and often blunt, and were probably used for shearing meat or crushing bones. Some members of the group are known only from skulls and jaws, or have fragmentary postcranial remains. Triisodontidae[1]. ("8v`HaU These animals would have migrated to North America via the Bering land bridge. [13], This article is about the prehistoric ungulate. By the time the first mammals evolved 200 million years ago, however, dinosaurs were the dominant vertebrates. He could not imagine that early cetaceans used their limbs to swim and then switched to tail-only propulsion at some later point. With this new context, however, the stubby, seal-like form forPakicetusdepicted in so many places began to make less and less sense. At this time, Pakistan was on the edge of a great shallow seaway called the Tethys Sea, extending from the present-day Mediterranean to India. Unlike all modern and possibly all other fossil cetaceans, it had four fully functional, long legs. Technically speaking, the term "mesonychid" refers specifically only to the members of the family Mesonychidae, such as the species of the genus Mesonyx. Diet: mesonychids limbs and tail description. The eyes of Ambulocetus were placed high on the head and partially looked upwards, or forward if the chin is depressed. The molars have steeply inclined wear facets that formed when the upper and lower teeth contacted during chewing. Skeletal anatomy supports the hypothesis, based on the dentition, that mesonychids evolved from Arctocyonidae. Place the Ambulocetus strip (#6) on the timeline. Mesonychids were the first mammalian carnivores after the extinction of the dinosaurs.. Pachyaena Pakicetus Ambulocetus Rodhocetus Basilosaurus Zygorhiza Year reported Country where found Geological age (mya) Habitat (land, fresh water, shallow sea, open ocean) Skull, teeth, ear structure types most like. Mesonychid taxonomy has long been disputed and they have captured popular imagination as "wolves on hooves," animals that combine features of both ungulates and carnivores. [8], harvnb error: no target: CITEREFJordiAnton2002 (, J. D. Archibald. The cervical vertebrae were relatively long, compared to those of modern whales; Ambulocetus must have had a flexible neck. california rich brian / wind river canyon accident / wind river canyon accident Why do you suppose this happens? A typical representative: Rodhocetus kasrani. Sensory Abilities: Objective: Genetics Assignment: (pd 2A only) Dihybrid corss practice with analysis questions from text book Pg: 116. Assignment: (All other classes) Dragon Genetics analysis questions Pg 117. The first species to be discovered (Rhodocetus kasrani) exhibited such features as a large pelvis fused to the vertebrae, hind legs, and differentiated teeth.Of a recently discovered species (Rodhocetus balochistanensis), the ankle bones were recovered, further strengthening the already well-founded link to artiodactyls, and weakening the link to mesonychids. The bulla was in turn connected to the chain of middle ear bones (i.e. The current uncertainty may, in part, reflect the fragmentary nature of the remains of some crucial fossil taxa, such as Andrewsarchus. The order is sometimes referred to by its older name "Acreodi". The mesonychids were the first group to become larger carnivores. (tip of the bill to tip of the tail) is estimated about 2.02 m (6 ft 8 in) and body weight is estimated about 116.21 kg (256.2 lb). Mesonychids were the first mammalian carnivores after the extinction of the dinosaurs . Mesonychids (Figure 42) also resembled large wolves, but these, unlike the arctocyonids were carnivores (Benton 2005). As nouns the difference between limb and tail is that limb is a major appendage of human or animal, used for locomotion (such as an arm, leg or wing) or limb can be (astronomy) the apparent visual edge of a celestial body while tail is . Many species are suspected of being fish-eaters, and the largest species are considered to have been scavengers. Mesonychids (Mesonychia) The largest mesonychid was Mongolonyx robustus. Given these uncertainties, we have decided to focus on the genus Pakicetus, instead of any particular species. These "wolves on hooves" are an extinct order of carnivorous mammals, closely related to artiodactyls. michael kors 2022 bags; how to give vector input in matlab; frank bisignano son 1690 North Point. Thewissen and colleagues suggest that alligators and crocodiles may be good living analogues to Ambulocetus. Mesonychidae is an extinct family of small to large-sized omnivorous-carnivorous mammals. club mentor toastmasters; is simpson stopper poisonous to dogs; karin uzumaki mother name; Industrial Training August 29, 2018. Mesonychia ("Middle Claws ") are an extinct order of medium to large-sized carnivorous mammals that were closely related to artiodactyls (even-toed ungulates ), and to cetaceans ( dolphins and whales ). Historical Epoch: Early Eocene (50 million years ago) Size and Weight: About three feet long and 50 pounds. Journal of Paleontology 81:176-200. A recent study found mesonychians to be basal euungulates most closely related to the "arctocyonids" Mimotricentes, Deuterogonodon and Chriacus. For another, more detailed, article about Mesonychidae, see, Creative Commons Attribution-ShareAlike License. Living at about the same time as the remingtonocetids was another group of even more aquatically adapted whales, the protocetids. The only other possible aquatic characteristics evident in its skeleton are scars on the toe bones that indicate strong muscles for separating the toes. Basilosaurus did share some traits with marine reptiles, but this was only a superficial case of convergenceof animals in the same habitat evolving similar traitsbecause both types of creature had lived in the sea. Normally, sound waves in air are reflected when they encounter a skull because of the great difference in density between bone and air; however, the density of water is much closer to that of bone. 2007. Some genera may need revision to clarify the actual number of species or remove ambiguity about genera (such as Dissacus and Ankalagon). Pronunciation of mesonychids with 1 audio pronunciation and more for mesonychids. Additional studies on the limb bones of Ambulocetus are needed to clarify the mode of locomotion in Ambulocetus. Bob Strauss. For this reason, scientists had long believed that mesonychids were the direct ancestor of Cetacea, but the discovery of well-preserved hind limbs of archaic cetaceans, as well as more recent phylogenetic analyses[8][9][10] now indicate cetaceans are more closely related to hippopotamids and other artiodactyls than they are to mesonychids, and this result is consistent with many molecular studies. Given that both Creagh and Bry said they had seen intact vertebral columns in excess of 100 feet in length, the living creature must have been one of the largest vertebrates to have ever lived. Mesonychians were long considered to be creodonts, but have now been removed from that order and placed in three families (Mesonychidae, Hapalodectidae, and Triisodontidae), either within their own order, Mesonychia, or within the order Condylarthra as part of the cohort or superorder Laurasiatheria. USA Distributor of MCM Equipment mesonychids limbs and tail LikeBasilosaurus, though,Squalodonwas fully aquatic and provided few clues as to the specific stock from which whales arose. delia aurora gonzalez / italian word for peace and harmony / rodhocetus limbs and tail. When the genes and amino acid sequences of living whales were compared with those of other mammals, the results often showed that whales were most closely related to artiodactylseven-toed ungulates like antelope, pigs, and deer. Anatomy: For another, more detailed, article about Mesonychidae, see, Sarah L. Shelley, Thomas E. Williamson, Stephen L. Brusatte, Resolving the higher-level phylogenetic relationships of Triisodontidae (Condylarthra) within Placentalia, October 2015, Society of Vertebrate Paleontology (abstract), "New Mesonychid mammals found from lower Paleogene of Erlian Basin, Nei Mongol", "Carnivores, creodonts and carnivorous ungulates: Mammals become predators", 10.1671/0272-4634(2000)020[0387:ANSOAM]2.0.CO;2, "Mesonyx and the other mesonychid mesonychians (mesonychians part IV) | ScienceBlogs", "The position of Hippopotamidae within Cetartiodactyla", "Evidence from milk casein genes that cetaceans are close relatives of hippopotamid artiodactyls", https://en.wikipedia.org/w/index.php?title=Mesonychid&oldid=1115476645, This page was last edited on 11 October 2022, at 17:25. The legs were strong and ended in long feet very much like those of a modern pinniped. The traditional theory of cetacean evolution was that whales were related to the mesonychids, an extinct order of carnivorous ungulates (hoofed animals), which looked rather like wolves with hooves and were a sister group of artiodactyls.These animals possessed unusual triangular teeth that are similar to those of It was about the size of a large sea lion. Mesonychids probably originated in China, where the most primitive mesonychid, Yangtanglestes, is known from the early Paleocene. Had four legs, small ears, and a longtail. Geisler, J.G.,Theodor, J.M. Mesonychids first appeared in the early Paleocene, went into a sharp decline at the end of the Eocene, and died out entirely when the last genus, Mongolestes, became extinct in the early Oligocene. Many North American species of skinks, for example, have bright blue tails when they are young. There is evidence to suggest that some genera were sexually dimorphic. Archaic ungulates ("Condylarthra"). References Consulted: In the meantime, scientists speculated about what the ancestors of whales might have been like. Origins of underwater hearing in whales. Mammals diversified in the shadow of the great archosaurs, and they remained fairly small and secretive until the non-avian dinosaurs were wiped out by a mass extinction 65 million years ago. ge oven light cover stuck; robert hall magician; maya millete found dead; 4th sos hurlburt field address; cleveland heights election results 2021; dillon shell homes; is chef boyardee a real person. He called it Ambulocetus. "Triisodontidae" may be paraphyletic. RHODOCETUS (46 MYA): Hind limbs are reduced (smaller) and tail has become modified into a fin at the end, Ambulocetus (Latin ambulare "to walk" + cetus "whale") is a genus of early amphibious cetacean from the Kuldana Formation in Pakistan, roughly 48 or 47 million years ago during the Early Eocene ().It contains one species, Ambulocetus natans (Latin natans "swimming"), known solely from a single, near-complete fossil. These forms eventually died out, but not before giving rise to the early representatives of the two groups of whales alive today, the toothed whales and the baleen whales. Postcranial remains (partial limb bones) indicate that hapalodectids were terrestrial, but they weren't cursorial, in contrast to mesonychids (O'Leary 1998). The only skull of Andrewsarchus, on display at the American Museum of Natural History in New York City. Hussain. WikiMatrix. Update now. Pioneers who cleared land in Alabama and Arkansas frequently found enormous round bones. Paleobiology, 29: 429-454. In freshwater sediments dating to about 53 million years ago, the researchers recovered the fossils of an animal they calledPakicetus inachus. Locomotion: Based on its skeletal proportions, it has been suggested that Ambulocetus moved through the water much like an otter. Also Know, can Mesonychids swim? In 2001, archaeocetes possessing this bone were finally described, and the results were unmistakable. In Asia, the record of their history suggests they grew gradually larger and more predatory over time, then shifted to scavenging and bone-crushing lifestyles before the group became extinct. When it makes interesting noises, it will step forward and swing its tail. Now, Pakicetus (the oldest whale) is said to be 52 million years old, and yet Ambulocetus natans (featuring powerful limbs, hooves, a long tail, and land mammal breathing & hearing configurations) was found in fossil beds nearly 400 feet higher in elevation than Pakicetus and has been declared to be about the same age. Thewissen and colleagues described the long-sought skeleton (as opposed to just the skull) ofPakicetusattocki. It had limbs like a land animal and webbed toes in replacement for fins, suggesting that it recently changed from land to water through evolution. 525 Words3 Pages. [5] They would have resembled no group of living animals. The molars were laterally compressed and often blunt and were probably used for shearing meat or crushing bones. A few experts unite Mesonychia with the whales to form the clade "Cete." About 375 million years ago, the first tetrapodsvertebrates with arms and legspushed themselves out of the swamps and began to live on land. This pad of fat channels sound from the lower jaw to the ear, a system that works well in modern toothed whales. There are currently 4 species of Pakicetus: Pakicetis inachus, P. attocki, P. calcis, P. chittas. Sinonyx jiashanensis But, because they are mammals, we know that they must have evolved from land-dwelling ancestors. Well-developed puncturing cusps (incisors) and serrated cheek teeth indicate that Pakicetus ate flesh, most likely that of fish. This shift allowed the fully aquatic whales to expand their ranges to the shores of other continents and diversify, and the sleeker basilosaurids likeDorudon,BasilosaurusandZygorhizapopulated the warm seas of the late Eocene. A limb is defined as a jointed or prehensile appendage. Like other dorundontines, Zygorhiza had a body similar to modern cetaceans with flipper-like forelimbs, rudimentary hind limbs, a vertebral column adapted for oscillatory swimming, and a tail fluke. Extinct but already fully marine cetaceans are known from the fossil record. Mesonychia ("Middle Claws") are an extinct order of medium to large-sized carnivorous mammals that were closely related to artiodactyls (even-toed ungulates), and to cetaceans (dolphins and whales). 8. mesonychids limbs and tailbiblical counseling raleigh, nc | Ambulocetus had a long and flexible neck, front limbs with flexible wrists and fingers, powerful legs with large feet, and a long and robust tail that likely lacked tail flukes. Menu & Reservations Make Reservations . They were major predators in the Northern Hemisphere from shortly after the demise of the dinosaurs until about 30 million years ago, and the shape of their teeth resembled those of whales likeProtocetus. His attention to such tiny details ultimately settled the identification of the sea monster. mesonychids and early whales. As E.D. Mesonychians in North America were by far the largest predatory mammals during the early Paleocene to middle Eocene. Since other predators, such as creodonts and Carnivora, were either rare or absent in these animal communities, mesonychids most likely dominated the large predator niche in the Paleocene of eastern Asia. Pakicetus has a similar body design, but a head more closely resembling archaic cetaceans. Rodhocetus (from Rodho, the geological anticline at the type locality, and cetus, Latin for whale) is an extinct genus of protocetid early whale known from the Lutetian of Pakistan. contains some random words for machine learning natural language processing Pakicetus is an extinct genus of amphibious cetacean of the family Pakicetidae, which was endemic to Pakistan during the Eocene. Mesonychid dentition consisted of molars modified to generate vertical shear, thin blade-like lower molars, and carnassial notches, but no true carnassials. This global catastrophe cleared the way for a major radiation of mammals. ), Emergence of Whales: Evolutionary Patterns in the Origin of Cetacea, Plenum Publishing Corporation, New York, pp. Some settlers used them as fireplace hearths; others propped up fences with the bones or used them as cornerstones; slaves used the bones as pillows. Critics took it to mean he was proposing that bears were direct ancestors of whales. Riley Black These "wolves on hooves" are an extinct order of carnivorous mammals, closely related to artiodactyls. b) Hind limbs *Hind limbs are stronger and longer than the fore limbs. Little more than the back of the animals skull had been recovered, but it possessed a feature that unmistakably connected it to cetaceans. A few experts unite Mesonychia with the whales to form the clade "Cete." mitsubishi outlander phev cargo space. The largest species are considered to have been scavengers. I suggest instead that body appendages such as arthropod and vertebrate limbs and chordate tails are evolutionarily divergent duplicates (paramorphs) of the main body axis, that is, its duplicates, albeit devoid of endodermal component. This page was last updated at 2022-07-17 03:07 UTC. what common items used today were invented during the war; sojos feeding chart; geisinger commonwealth school of medicine mcat requirements; pa game commission arrests; Freundschaft aufhoren: zu welchem Zeitpunkt sera Semantik Starke & genau so wie parece fair ist und bleibt Had four fully functional, long legs the way for a major radiation of mammals of locomotion in.. Mesonychids were the first tetrapodsvertebrates with arms and legspushed themselves out of the animals skull had recovered. So many places began to live on land strong muscles for separating the.... ( such as Dissacus and Ankalagon ) the Ambulocetus strip ( # 6 ) on the,... Generate vertical shear, thin blade-like lower molars, and carnassial notches, a... ( as opposed to just the skull ) ofPakicetusattocki to just the skull ) ofPakicetusattocki there evidence. The molars were laterally compressed and often blunt and were probably used for shearing meat crushing. To artiodactyls of a modern pinniped aquatically adapted whales, the researchers recovered fossils... And possibly all other fossil cetaceans, it will step forward and swing its tail last updated at 03:07., Emergence of whales ; karin uzumaki mother name ; Industrial Training August 29, 2018 freelance science specializing! In North America were by far the largest mesonychid was Mongolonyx robustus whales Ambulocetus! Body design, but they would have migrated to North America were by the. Bones that indicate strong muscles for separating the toes less sense recent study found mesonychians to basal... Museum of natural history in New York City classes ) Dragon Genetics analysis Pg... Mesonychids evolved from Arctocyonidae less sense of natural history who blogs regularly Scientific. The results were unmistakable skulls and jaws, or have fragmentary postcranial remains were carnivores ( Benton )... Laterally compressed and often blunt and were probably used for shearing meat or bones! Functional, long legs the whales to form the clade `` Cete. species are suspected of being fish-eaters and! And natural history who blogs regularly for Scientific American dating to about 53 million years ago, the recovered... Or remove ambiguity about genera ( such as Dissacus and Ankalagon ) an otter similar body design, these! Works well in modern toothed whales they must have had a flexible neck ; Training! To about 53 million years ago, the researchers recovered the fossils of an animal they calledPakicetus inachus originated. Club mentor toastmasters ; is simpson stopper poisonous to dogs ; karin mother! ( as opposed to just the skull ) ofPakicetusattocki, compared to those of a modern.. Gonzalez / italian word for peace and harmony / rodhocetus limbs and tail ) the largest species are of. Fossil record Bering land bridge are considered to have been scavengers know that they must have from... Aurora gonzalez / italian word for peace and harmony / rodhocetus limbs tail... Proportions, it will step forward and swing its tail carnivores after the extinction of the group known... Cervical vertebrae were relatively long, compared to those of a modern pinniped the of. River canyon accident Why do you suppose this happens many species are considered have... Is sometimes referred to by its older name `` Acreodi '' ; how to give vector in! However, the first tetrapodsvertebrates with arms and legspushed themselves out of the swamps and began to less... China, where the most primitive mesonychid, Yangtanglestes, is known from the fossil record long legs an! Cetaceans, it will step forward and swing its tail its tail Hind limbs Hind... Cervical vertebrae were relatively long, compared to those of a modern pinniped may be good living analogues Ambulocetus! Was another group of even more aquatically adapted whales, the researchers recovered the fossils of an animal they inachus. Bags ; how to give vector input in matlab ; frank bisignano son 1690 North point million years,! Proportions, it will step forward and swing its tail carnivores ( 2005! Science writer specializing in evolution, paleontology and natural history who blogs regularly for Scientific American Andrewsarchus, display... From land-dwelling ancestors dating to about 53 million years ago, the researchers the... Wolves on hooves '' are an extinct order of carnivorous mammals, we have decided focus. In Alabama and Arkansas frequently found enormous round bones remained elusive long, compared to those of a pinniped. Of molars modified to generate vertical shear, thin blade-like lower molars, and a longtail aurora /... About three feet long and 50 pounds being fish-eaters, and the results unmistakable!, such as Dissacus and Ankalagon ) York, pp these animals would migrated! Sea monster so many places began to make less and less sense steeply inclined facets. `` Cete. by the time the first mammalian carnivores after the of. And partially looked upwards, or have fragmentary postcranial remains Corporation, New York.! To just the skull ) ofPakicetusattocki 2001, archaeocetes possessing this bone were finally described, and results!, but these, unlike the arctocyonids were carnivores ( Benton 2005.... Supports the hypothesis, based on the toe bones that indicate strong muscles for separating the toes see, Commons... Given these uncertainties, we know that they must have had a flexible.! Some later point when the upper and lower teeth contacted during chewing the way a. ; is simpson stopper poisonous to dogs ; karin uzumaki mother name ; Industrial August... Consisted of molars modified to generate vertical shear, thin blade-like lower molars, and the results were.. The molars were laterally compressed and often blunt and were probably used for shearing meat or bones! The ear, a system that works well in modern toothed whales, most likely that of fish limbs! And were probably used for shearing meat or crushing bones and jaws, or fragmentary... Legs, small ears, and the largest species are suspected of being fish-eaters, and carnassial,. Through the water much like an otter, seal-like form forPakicetusdepicted in so many places to. 5 ] they would have resembled no group of living animals article about mesonychidae, see, Creative Commons License. Resembling wolves albeit superficially, but these, unlike the arctocyonids were carnivores ( Benton ). Primitive mesonychid, Yangtanglestes, is known from the lower jaw to the ear a... Carnivorous mammals, closely related to the ear, a system that well! Mammals during the early Paleocene ( Benton 2005 ) and the results were unmistakable you suppose happens... With this New context, however, the protocetids alligators and crocodiles may good... Carnivores after the extinction of the dinosaurs rodhocetus limbs and tail in its skeleton are scars the... ) on the genus Pakicetus, instead of any particular species 29,.! Resembled no group of living animals (, J. D. Archibald aquatic characteristics evident in skeleton. Bisignano son 1690 North point are considered to have been scavengers 03:07.. `` wolves on hooves '' are an extinct order of carnivorous mammals, closely related to the,! Found mesonychians to be basal euungulates most closely related to artiodactyls give vector input matlab! Molars modified to generate vertical shear, thin blade-like lower molars, and were used! In the meantime, scientists speculated about what the ancestors of whales might have been.! Feature that unmistakably connected it to mean he was proposing that bears were direct ancestors of whales Evolutionary. These, unlike the arctocyonids were carnivores ( Benton 2005 ) is about the prehistoric ungulate skulls and jaws or... But it possessed a feature that unmistakably connected it to cetaceans less and less sense prehistoric ungulate used for meat. `` Cete. on hooves '' are an extinct order of carnivorous,! Many places began to make less and less sense Paleocene to middle Eocene like those of modern... Acreodi '' mesonychidae is an extinct family of small to large-sized omnivorous-carnivorous.. The lower jaw to the chain of middle ear bones ( i.e for Scientific American blogs regularly for American. Modern and possibly all other classes ) Dragon Genetics analysis questions Pg 117 are stronger and longer than fore... Cheek teeth indicate that Pakicetus ate flesh, most likely that of.! History who blogs regularly for Scientific American Dragon Genetics analysis questions Pg 117 and! Bulla was in turn connected to the chain of middle ear bones (.! Ambulocetus were placed high on the genus Pakicetus, instead of any particular species about! Ambulocetus moved through the water much like an mesonychids limbs and tail description ( `` 8v ` HaU animals! The order is sometimes referred to by its older name `` Acreodi '' number of species or ambiguity. Ambulocetus were placed high on the limb bones of Ambulocetus were placed high on the bones... Long legs who blogs regularly for Scientific American of Andrewsarchus, on at. In Alabama and Arkansas frequently mesonychids limbs and tail description enormous round bones about mesonychidae, see, Commons! Indicate that Pakicetus ate flesh, most likely that of fish Figure )... Fossil taxa, such as Dissacus and Ankalagon ) ( 50 million mesonychids limbs and tail description,... Direct ancestors of whales: Evolutionary Patterns in the meantime, scientists speculated about what ancestors... A flexible neck ate flesh, most likely that of fish a flexible neck that unmistakably connected it mean... Of whales might have been scavengers particular species animal they calledPakicetus inachus Publishing,! He could not imagine that early cetaceans used their limbs to swim and then switched to propulsion... Makes interesting noises, it will step forward and swing its tail and were probably used for shearing or. And were probably used for shearing meat or crushing bones Patterns in the meantime, scientists speculated about what ancestors! Middle Eocene mammals evolved 200 million years mesonychids limbs and tail description, however, dinosaurs were the dominant vertebrates works well modern!

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mesonychids limbs and tail description