A: If these animals moved in groups or found themselves in groups fortuitously or incidentally then co-operative hunting of a sort is plausible, since even animals that don't live together will co-operate to herd or cluster prey. Direct evidence consists of various grades of stomachcontents; indirect evidence includes bite marks; and general evidence consists of functional analyses. The aquatic plesiosaurs were thought to have died off with the rest of the dinosaurs 65 million years ago. pp. Before we get into that, Id like to make a few comments about plesiosaur life appearance. Then again, living snakes and lizards dont have teeth that protrude or interlock in the same fashion as plesiosaur teeth. The hooklets closely resemble those of the contemporaneous belemnite, Belemnoteuthisantiquus. Taylor, M. A. A new leptocleidid (Sauropterygia, Plesiosauria) from the Vectis Formation (Early Barremian-early Aptian; Early Cretaceous) of the Isle of Wight and the evolution of Leptocleididae, a controversial clade. This included the serpent, a fish, a dinosaur and a turtle. The 33ft (10m) long ichthyosaur skeleton, which is about 180 million years old, was found at Rutland Water Nature Reserve. "This is a medium-sized predator, similar to a sea lion, that ate small fish and was likely preyed upon by larger predators at the top of the food chain," White said. Advertising Notice Macroplata was an early plesiosaur. Indeed, preserved bite marks showing that it sometimes attacked, and presumably fed on, its long-necked relative Cryptoclidus. Killer whales eat large vertebrates, so pliosaurs probably did, too. Were plesiosaurs the fastest marine reptiles of the Mesozoic era? Daniel and I discussed the possibility of putting tail fins on the plesiosaurs of Plesiosaur Peril, but ultimately the information came in too late for us to be confident about including it the Liopleurodons tail, at least, does have a small fin, though, as a nod to this possibility. Theres no question that plesiosaurs were limb-propelled swimmers. Chatterjee and Small,1989) then they would presumably be able to go for considerable periods of timewithout food. To help avoid their eggs being eaten by other animals, Plesiosaurus most likely buried them into the soft sand. (1999) who observed that gastrolithsand gizzards are common in herbivorous birds, but absent in carnivorous birds. Interested in an electric car? The plesiosaurus was carnivorous creature. Classification and Scientific Name. One of the most intriguing Plesiosaurus facts is that these reptiles were probably not very good at swimming. Plesiosaurs and Pliosaurs - The Sea Serpents - ThoughtCo That means they were twice as long as a modern horse and weighed twice as much as a modern hog. dolichodeirus, or Plesiosaurus, was not a dinosaur, but a plesiosaura marine reptile (Greeknear to lizard) from the Mesozoic Era of the Early Jurassic period. This may be analogous tothe extant crab eater seal, which has sieve-like teeth for capturing krill (Martill et al. Palaeontology 36, 357-360. A: My best guess (largely concordant with what other plesiosaur researchers think is likely) is that they remained concealed as best as possible before dashing out (or up) at speed. The evolution of plesiosaur and pliosaur morphotypes in the Plesiosauria (Reptilia: Sauropterygia). Whats the spitting dinosaur in Jurassic Park? Available at: http://www.flmnh.ufl.edu/herpetology/herpbiology/bartram.htm. Join thousands of Science buffs. In an Australian first, PhD candidate Joshua White & co-authors used a micro-CT scanner to examine the stomach contents of the Australian Museum's 'Eric the plesiosaur'. Also, what gives with the teeth and jaw edges of these animals? The most recent work indicates that virtually all Jurassic lineages became extinct round about the Jurassic-Cretaceous Boundary, with a single surviving lineage the Xenopsaria then undergoing a major burst of radiation during the Cretaceous, giving rise to new versions of Jurassic-style body plans (Benson & Druckenmiller 2014). Massare (1987) divided large aquatic reptiles into groups based on their toothform and placed the groups into triangular morphospace. What type of food did plesiosaurs eat? - Quick-Advices Numerous species have been assigned to Cetiosaurus over the years belonging to several different groups of sauropod dinosaurs. As you can tell from Plesiosaurus pictures it makes them look very much like a combination of a snake and a turtle. I can buy brief settling or foraging on the seafloor, but no extended time spent there. Paleontologists discovered 938 different specimens. This family of reptiles is characterized by their long necks, sleek bodies, small heads and wide flippers. The geological indicators of fossil recovery support the theory that coastal regions were the primary location for brooding and feeding. Not only do such specimens illustrate how all those bones went together, but sometimes there are little associated bonuses that could not be seen if the skeleton had been scattered. In the case of a 161- to 155-million-year-old plesiosaur recently discovered in Wyoming, the marine reptile died with its last meal preserved in its stomach. Thepresence of gastroliths is common in plesiosaurs. Dinosaurs went into decline near the end of the Cretaceous Period, about 66 million years ago. This is called "inertial feeding," a behavior . Campos, Z., Sanaiotti, T., Muniz, F., Farias, I. Discover world-changing science. The monarch butterflys spots may be its superpower. Some evidence is strongerthan others! between 228 million and 61.6 million years ago, What class was this dinosaur assigned to? Journal of Evolutionary Biology 14, 987-991. Some were macropredators that attacked and ate other plesiosaurs as well as ichthyosaurs, swimming crocodyliforms and turtles. When it comes to what we really know about plesiosaurs, the literature includes a fair bit about the possible biomechanics of swimming, but is generally focused on anatomy, systematics and phylogeny. Wildfire smoke affects birds too. Sharks and mid-sized pliosaurs that came to attack the baby could well have received nasty flipper-smacks from the mother. Plesiosaur Peril. Sign up for FREE and keep up-to-date with all the best events, discounts, and facts! Would it have travelled in groups? 7 Where did the plesiosaurs live? The creature was a sauropterygian. 24 Do plesiosaurs lay eggs? They write new content and verify and edit content received from contributors. What Do Plesiosaurs Eat Theblogy.com This is the first time ichthyosaur remains have been found inside a plesioaur. Q: Is there any evidence for pack hunting in pliosaurs? What is a Plesiosaur? This reflects part of the back-and-forth that went on between Daniel and myself as he did his research for the book. Plesiosaur ( Illustration: Shutterstock) The ancient marine reptile, known endearingly as "Eric" after a character from the British comedy group Monty Python, is a member of the Plesiosauria. The evidence comes from two sets of gut contents described in 2005 by paleontologists Colin McHenry, Alex Cook, and Stephen Wroe in a one-page Science report. They ate fish, squids, mollusks and other small sea creatures. What is the classification of a plesiosaur? Journal of Natural History 46, 2979-2984. These issues have been much discussed in the literature (Robinson 1975, Tarsitano & Riess 1982, Halstead 1989, Riess & Frey 1991, OKeefe 2001a, Carpenter et al. Plesiosaurs and the repeated invasion of freshwater habitats: late-surviving relicts or evolutionary novelties? By clicking 'Send to a friend' you agree ABC Online is not responsible for the content contained in your email message. Pliosaur fossils have been found in Antarctica and other parts of the world. The name of this reptile means almost lizard.. & Larson, P. 2010. Kids Can Press, Toronto. What did plesiosaurs eat and how do we know? Heres what science recommends. The find suggests these animals had a much more balanced diet than once thought, which researchers say probably explains why they survived for so many millions of years. In 1708, the Swiss naturalist Johann Jakob Scheuchzer described two ichthyosaur vertebrae assuming they belonged to a man drowned in the Universal Deluge. Science (New York, N.Y.), 310 (5745) PMID: 16210529, Copyright 1996-2015 National Geographic SocietyCopyright 2015-2023 National Geographic Partners, LLC. A paddle-legged marine reptile akin to the recently-discovered, shark-shaped animals known as ichthyosaurs, the new animal was cast as a link between the Ichthyosaurus and Crocodile in the connected chain of organized beings.. What Did Plesiosaurs Eat Theblogy.com It is regarded as a generalsistic feeder. There are a few big pliosaur specimens where snout tips and flippers seem to have been bitten by other, similarly-sized pliosaurs, so we may even have direct evidence for this sort of behaviour. How tetrapods feed in water: a functional analysis by paradigm. A: As per the above comments on Cryptoclidus, social bonds of some sort involving parental or mating relationships are now plausible for these animals, so we might imagine twos or threes working together. Teuthid cephalopod hookletsare present in one pliosaur from the Lower OxfordClay of Peterborough, alongside sparse fish teeth and an indeterminate reptile tooth (Martill et al. Bottom-feeding plesiosaurs. Wilhelm, B. C. 2010. But its something to be curious about; something that will only be informed by the discovery of exceptional specimens. in Weishampel, D., and White, N. eds. Q: Is basking behaviour likely for pliosaurs? 2023 Scientific American, a Division of Nature America, Inc. Confusingly, the name "plesiosaur" also encompasses the pliosaurs ("Pliocene lizards," even though they lived tens of millions of years before), which possessed more hydrodynamic bodies . A: The slim teeth of Cryptoclidus suggest that this animal wasnt habitually able to eat or subdue anything tough-shelled or chunky, so shrimps and thin-shelled bivalves are probably at the extreme end of what it was capable of subduing. Hard and soft-bodied cephalopods also formed part of the diet of all plesiosaurs. Thanks for reading Scientific American. Recent Plesiosaurus fossil discoveries have led scientists to believe that it was a live-bearer of its young, completely contradicting the popular belief based on previous discoveries. Riess, J. In general, however, we of course know very little about plesiosaur biology and behaviour, and Id say that most questions we might ask can only be informed by inference: by extrapolating or guessing based on what we see in living reptiles and other animals. Some lizards, crocodylians and turtles really are social, hanging out in groups or pairs deliberately (examples: spiny-tailed goannas, gopher tortoises), others have long-term monogamy and pair-bonding (examples: American alligators, Shingleback skinks). It was the first to be identified as being from the Order Plesiosauria, and every variation of plesiosaur was . 8 What killed the fat guy in Jurassic Park? plesiosaur, (clade Plesiosauria), any of a group of long-necked marine reptiles found as fossils from the late Triassic Period into the late Cretaceous Period (215 million to 66 million years ago). Biological Reviews 85, 361-392. So were plesiosaurs scaly or smooth-skinned? Plesiosaurus (Greek: ( plesios ), near to + ( sauros ), lizard) is a genus of extinct, large marine sauropterygian reptile that lived during the Early Jurassic. A and C), while the teeth ofkiller whales (Orcinus orcus) sharemany similarities with pliosauromorphs (fig 10. Both sets of gut contents ensconced within the skeletal stomach cavities of two long-necked plesiosaurs found in Australia were chock-full of fragments from invertebrates which sat and scuttled on the seafloor. "If an animal had a dietary change, we want to examine why this change happened, so that we can compare the findings in extinct animals to modern animals such as dolphins or whales and try to predict how their diet may change due to global warming, and why. Neues Jahrbuch fur Geologie und Palontologie, Abhandlungen 149, 286-332. Some data indicates that plesiosaurs had complex social lives, and I certainly consider it plausible that extended social bonds were present in these animals. Q: Any possibility that Cryptoclidus might have dug or foraged for prey like clams or crabs? The differencemay be genuine and could represent different functional regimes between pliosaursand plesiosaurs (Storrs, 1993). The forelimbs on the other hand, were relatively long. Paleobiology 28, 101-112. One stomach was full of crushed clams and snails while the other contained pieces of clam. What did the largest meat-eating dinosaur eat? September 27, 2022 by Editorial Team Plesiosaurs are the largest land animals in the world, and they are also the most basal land animals. 1991). How fast can a plesiosaur swim? Coprolites are relatively common in Mesozoic marine strataand while they are probably from large marine reptiles, it isnt possible to positively identify any as plesiosaurian in origin. The modern loch ness monster myth is always described as a plesiosaurus. What did the plesiosaur eat? - DIY Seattle Massare (1988) comes to similar concusions based on the hydrodynamicproperties of Mesozioc reptiles and calculated speeds of2.3 m/sec (= slow ambush predator) for plesiosauroids and slightly faster (=pursuit predator) speeds for pliosauroids. A mosasaurus eats small fish and other small animals. Pliosaurs possessed powerful jaws and large teeth, and they used four large fins to swim through Mesozoic seas. Image from Flickr user Ryan Somma. Plesiosaurs were a diverse family of giant marine reptiles (not dinosaurs) that lived during the Mesozoic Era and have no living relatives. - Thelma Thinks What Do Plesiosaurs Eat? 27 Did plesiosaurs eat meat? 2001). Use this form to email 'Plesiosaurs ate snails and clams' to someone you know: A: Crocs do head slaps, white sharks smack their tails on the water surface, and whales breach [adjacent image by Gillfoto]. - ., Ketchum, H. F., Naish, D. & Turner, L. E. 2013. Wroe is not ruling out the idea stomach stones were also useful for ballast. De la Beche, H.; Conybeare, W. 1821. "Its teeth would have been wholly inadequate for processing hard-shelled animals like clams.". Many pliosaurs were pursuit predators of various sized prey, and opportunistic feeders in the general and cut guilds of Massare (1987). A cladistic analysis and taxonomic revision of the Plesiosauria (Reptilia: Sauropterygia). A diet practiced by early amphibians, piscivory involved evolution to insectivory and then ultimately herbivory, added by reptilian species. - . It swam by flapping its fins in the water, much as sea lions do today, in a modified style of underwater flight. The nostrils were located far back on the head near the eyes. The jaws are the primary structure for acquiring food so functional analysis of the jaws and dentition(teeth) is useful for determining diet (Pollard, 1990). Please refer to the appropriate style manual or other sources if you have any questions. How big was the ichthyosaur skeleton found in Rutland? . Let us know if you have suggestions to improve this article (requires login). Types of evidence for diet Pollard (1990) classified evidence for diet in prehistoric organisms into three broad categories: direct, indirect and general. 1989. Its possible, perhaps likely, that we will never know about these sorts of things. The Fastest Dinosaur is a Tyrannosaurus Rex. Check out the Tet Zoo podcast at tetzoo.com! 2005). Pachycephalosaurus. Ketchum, H. F. & Benson, R. B. J. Benson, R. B. J. Are electric bikes the future of green transportation? A Plesiosaur That Ate Ichthyosaurs for Lunch | Science| Smithsonian Isolated bones and partial articulated skeletons are found in many Mesozoic deposits and may be indicative oftwist-feeding and shake-feeding (Martill et al. Theres some controversy over how old kelp and similar algae are, but if they were present in the Jurassic we might perhaps imagine a pliosaur hiding in a kelp forest imagine the unlucky prey animal that swims into such a lurking giant. Firstly, the juvenile might well travel close to the mothers body so as to be concealed from predators (as occurs in whales). I cant think of any living animals that deliberately stir up sediment to conceal themselves, but there are whales (Kogia) that produce a cloud of reddish fluid (probably faeces) and then hide inside the cloud. Cookie Policy what did the plesiosaur eat at aid in chewing its food? These were characterised by their long tail, long neck, small head, large body and four strong pillar-like legs. Plesiosaurs had a broad flat body and a short tail. It is known by nearly complete skeletons from the Lias of England. In Callaway, J. What Does A Plesiosaur Eat Theblogy.com Q: Any possibility of Liopleurodon eating drowned or swimming dinosaurs? Bottom-feeding plesiosaurs. Anolfactory system (Cruickshank et al. Finding an articulated fossil skeleton is always a delight for paleontologists. Create your free account or Sign in to continue. Whe. 9 What are plesiosaur predators? Darren Naish is a science writer, technical editor and palaeozoologist (affiliated with the University of Southampton, UK). An even larger pliosaur from the Jurassic Period, Pliosaurus funkei (known colloquially as Predator X), was unearthed in Svalbard in 2009. Early finds. Is a Stegosaurus a herbivore or carnivore? Coprolites must be used in association with criteria 2, 3 and 5 (table 1) to determine who did it?. Predation consists of several phases: (1) search, (2) capture, (3) penetration, (4) ingestion(= subjugation), (5) digestion, and (6) defecation (Brett, 1990). Whereas most plesiosaurs subsisted on fish, pliosaurs (like their underwater neighbors, the prehistoric sharks) probably fed on anything and everything that ventured their way, ranging from fish to squids to other marine reptiles. & Chiappe, L. M. 2011. Missing bones were what caused them to miscast their mosnter. The answer: Dinos, specifically long-necked 'sauropods' like Diplodocus, munched on stomach-clogging "gastroliths" during an epic quest for food. Local and seasonal variation in the availability of prey is a factor that can influence diet (Massare,1987; Martill et al. However, some species of plesiosaur may enjoy kibble that is high in protein and low in carbohydrates, as these creatures are known to require a high level of protein in their diet to survive. Photo: Alcheringa: An Australasian Journal of Palaeontology. Q: Was Cryptoclidus social? - . For previous Tet Zoo articles on plesiosaurs and other sauropterygians, see Bakker, R. T. 1993. Their teeth were used to pierce small soft-bodied prey such as fish and cephalopods (Massare, 1987). Plesiosaur extinction cycles - events that mark the beginning, middle and end of the Cretaceous. Clearly the elongated necks of these animals evolved for some adaptive reason and were useful enough that a diverse array of plesiosaurs were widespread in both space and time. 1991) (fig 8) has been suggestedas a common adaptation in the Plesiosauria (Brown and Cruickshank, 1994). Early theories speculated it was possible, but more recent discoveries indicate that Plesiosaurus flippers could not have supported its weight for movement on land, but could have pushed the creature through shallow waters. But the new research has found that the plesiosaur's long neck also allowed the animal to feed on bottom-dwelling life. Adetailed analysis of the functional morphology of the skull has been performed for two well-known pliosaurs, Rhomaleosaurus zetlandicus from the Lower Jurassic (Taylor, 1992) and Pliosaurusbrachyspondylus from the Upper Jurassic (Taylor and Cruickshank,1993). Theres even possible evidence for this, since armour plates from an ornithischian dinosaur were apparently found within the stomach contents of a pliosaur (Taylor et al. They typically had broad bodies, short tails, and large flippers. It clearly has a reptile backbone. Get the latest Science stories in your inbox. Conybeares twin visions of Plesiosaurus sculling the Mesozoic seas with their heads held high and ambushing unwary fish just beneath the waves remained the canonical visions of these creatures for over a century and a half. The most fascinating thing about Plesiosaurus is the fact that they looked like a combination of the characteristics of many animals. Q: What do you think about the possibility that these animals might have intentionally beached for safety or escape, like walruses or seals or penguins? Riley Black "We were very fortunate to study one of the most complete skeletons of vertebrates in Australia, with almost 93% of the fossil still intact, which is almost unprecedented in terms of fossil preservation," he explained. Neues Jahrbuch fr Geologie und Palontologie 164, 188-192. Brontosaurus. pp. 1975. The first known illustrations of ichthyosaur bones, vertebrae, and limb elements were published by the Welshman Edward Lhuyd in his Lithophylacii Brittannici Ichnographia of 1699. He says the fact that plesiosaurs could eat such a diverse diet might help to explain why the animals were so successful. & Frey, E. 1991. How much Torpidity does a titanosaur have. Q: Do you think that pliosaurs were ambush predators? An additional guild has been proposed to accommodate such oddities: a trap guild (Chatterjee and Small, 1989). A rushing upwards style of attack is inferred for large pliosauromorphs,an analogy drawn from the modern great white shark (Carcharodon)(Martill and Naish, 2000). The long tail would be used to balance its weight. Its well known these days that plesiosaurs were almost certainly not capable of the erect-necked or swan-necked poses shown in older artwork: the anatomy is against it, it doesnt work when we consider their buoyancy and pose in the water, and its not consistent with what we understand of their ecology and behaviour anyway. While the animals body shape suggested that it swam like a shell-less turtle, Conybeare proposed, might the long neck of Plesiosaurus have obligated the animal to swim at the surface, arching its long neck like the swan, and occasionally darting it down at the fish which happened to float within its reach? Alternatively, Conybeare imagined that Plesiosaurus was the underwater equivalent of a snake in the grass, relying on the suddenness and agility of the attack which [the length of flexibility of its neck] enabled it to make on every animal fitted for its prey, which came within its extensive sweep.. Im speculating here but, theoretically, a big juvenile pliosaur of several years old could conceivably meet up with its mother.. and, if she has a new juvenile, we can get a group of 3 animals (or more). The views expressed are those of the author(s) and are not necessarily those of Scientific American. Understandably, Daniel wanted Liopleurodon as the villain of the piece: the lurking predator that presents the main danger to our cryptoclidid heroes. The shape of the sclerotic ring suggests the eyes were flattened to assist with underwatervision (Lambert et al. When these reptiles were first found, they were often depicted as locked in mortal combat, two sea dragons that were destined to duel, but evidence of such awesome battles has not been found. Plesiosaurs. Everhart, M. 2005. 22 Was the plesiosaur a carnivore? On the Discovery of an Almost Perfect Skeleton of the Plesiosaurus. De la Beche and Conybeare were not advocating an evolutionary view. OZ fossils - The Age of Reptiles - Eromanga Sea - Plesiosaurs Velociraptor. What did Plesiosaurus eat? If they were incapable of raising their heads above the water to ambush prey from above and lacked the flexibility to suddenly dart their heads out of the shadows to gulp down fish, then how were they feeding? Plesiosaurus - Wikipedia How is an ichthyosaur different from a fish? There is no one definitive answer to this question. How many years ago did this dinosaur live? Plesiosaurs had a wide distribution in European seas and around the Pacific Ocean, including Australia, North America, and Asia. OKeefe, F. R. 2001a. Mosasaur | Size, Diet, & Facts | Britannica Plesiosaurs (Greek for "almost lizards") were large, long-necked, four-flippered marine reptiles that paddled their way through the oceans, lakes, rivers, and swamps of the Jurassic and Cretaceous periods. Liopleurodon sp. Speculation about the transmutation of species was absurd and extravagant, the naturalists said. Plesiosaurs hunted visually and possibly had a directional sense of olfaction. Plesiosaurus would then move to shallower beach areas and lay eggs that would be land-bound except during tide. 1993) and pterosaurs(Massare, 1987). Science 310, 75. The plesiosaur that was the subject of the new research probably scooped up the embryonic ichthyosaur after its mother had expelled it; there was probably no titanic battle like the one envisioned in Journey to the Center of the Earth. I like to imagine these animals as combining various behavioural traits of cetaceans, crocs and lizards. Plesiosaur | Size, Habitat, & Facts | Britannica Tags: marine-biology, dinosaurs, palaeontology. These bug repellents actually workif you use them correctly, People with ADHD struggle to stay afloat amid drug shortage, A supersonic jet chased a solar eclipse across Africafor science. Ok, on to the Q&A. The Marine Reptiles of The Late Cretaceous, Lived from the Early to the Middle Jurassic Period, May have laid eggs in the sand like sea turtles. Is it normal for cats to stay up all night? Kids Can Press, Toronto. Reconstructing live plesiosaurs a tricky task. A cladistic analysis and taxonomic revision of the Plesiosauria (Reptilia: Sauropterygia). The ancient marine reptile, known endearingly as "Eric" after a character from the British comedy group Monty Python, is a member of the Plesiosauria family that lived during the Jurassic period 200 million years ago and could reach lengths of up to 3 meters. There was no reason to think that the neck was very much longer, and the skulls of ichthyosaurs and crocodiles hinted that Plesiosaurus, too, would have had an elongated noggin. They eat small prey, such as small fish, amphibians, and small reptiles. Rhomaleosaurus is interpreted as feeding on a wide range of prey andforcibly dismembering large prey. Remains of an ornithischian dinosaur in a pliosaur from the Kimmeridgian of England. However, if this one plesiosaur really was like this, it doesnt mean that they all were (nor would that peculiar skin texture necessarily apply to the whole body). Bloomington: Indiana University Press. (1994) identify eight categories to assess the strength of evidence for trophic links in the Middle Jurassic Oxford Clay (see Table 1). Imagine benthic-foraging plesiosaurs flushing prey towards others, or a group of them hemming prey in, and moving together so that the prey gets bunched up. The vertebrae of the animal were flat-ended which means that it seemed to be very stiff-necked. Corrections? Some scientists believe that plesiosaur could walk on land, while others believe that they could not. The small-headed plesiosauromorphs were unable to rip chunks from carcasses becausetheir skulls were lightly built (Brown and Cruickshank, 1994) with compressed mandibular ramiand weak mandibular symphysis, so they were unableto resist torsion (Cruickshank, 1994)/ Plesiosaur teeth were not used for chewing sothe size of prey in these forms was directly limited by the size of theirgullet (Massare, 1988). stones that were called gastroliths How do we know what an ichthyosaur looks like? For example, Elasmosaurus, a plesiosaurid, had as many as 76 vertebrae in its neck alone and reached a length of about 13 metres (43 feet), fully half of which consisted of the head and neck. And studies of fossilised gut contents from North American plesiosaurs suggest this is what they ate. Last Updated on July 22, 2022 by amin. Allplesiosaurs were predatory carnivores belonging to one or more of four ecological feeding guilds. Whatever the function of the stomach stones, they appear to have been very important to plesiosaurs, which travelled a long way to find them. OKeefe, F. R. 2001a. Plesiosaurs are the largest land animals in the world, and they are also the most basal land animals. Anyway, I think its plausible to think of related individuals co-operating. Plesiosauroids and pliosauroids had different locomotoay repertoires. Invaluable studies of jaw biomechanics, tooth form and stomach contents give us insights into what and how plesiosaurs ate, and on how they collected and processed their food (Massare 1987, Taylor 1987, 1992), and some extremely interesting ideas on breathing and olfactory behaviour have been proposed (Cruickshank et al.
Sequoia Elementary Sanger Bell Schedule, Articles W