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Plesiosaur

 

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Plesiosaur


 
 

History of discovery

The first plesiosaur skeletons were found in England by Mary AnningMary Anning

Mary Anning was an early British fossil collector and paleontologist. ...
, in the early 1800s, and were amongst the first fossil vertebrates to be described by science. Many have been found, some of them virtually complete, and new discoveries are made frequently. One of the finest specimens was found in 2002 on the coast of SomersetSomerset

Somerset is a county in the south-west of England....
 (England) by someone fishing from the shore. This specimen, called the Collard specimen after its finder, was on display in TauntonTaunton

Taunton is the county town of Somerset, England....
 museum in 2007. Another, less complete skeleton was also found in 2002, in the cliffs at FileyFiley

Filey is a small town in between Scarborough and Bridlington on the North Sea coast of the UK....
, YorkshireFacts About Yorkshire

Yorkshire is the largest historic county of England and Great Britain, covering just under 6,000 sq....
, EnglandEngland

England is the largest and most populous constituent country of the United Kingdom....
, by an amateur palaeontologist. The preserved skeleton is displayed at Scarborough Rotunda Museum.

Many museums have plesiosaur specimens. Notable among them is the collection of plesiosaurs in the Natural History MuseumNatural History Museum

-||-||-||}The Natural History Museum is one of three large museums on Exhibition Road, South Kensington, London....
, LondonLondon

London is the capital city of England and of the United Kingdom....
, which are on display in the marine reptiles gallery. Several historically important specimens can be found there, including the partial skeleton from Nottinghamshire reported by Stukely in 1719 which is the earliest written record of any marine reptile. Others specimens include those purchased from Thomas Hawkins in the early 19th century.

Specimens are on display in museums in the UK, including New Walk Museum, Leicester, The Yorkshire Museum, The Sedgwick MuseumSedgwick Museum of Earth Sciences

The Sedgwick Museum of Earth Sciences, opened in 1904, is the geology museum of the University of Cambridge in England....
 in Cambridge, Manchester Museum, Warwick Museum, Bristol MuseumBristol City Museum and Art Gallery

The Bristol City Museum and Art Gallery is a large museum and art gallery in Bristol, England....
 and the Dorset Museum. A specimen was put on display in Lincoln Museum in 2005. Peterborough Museum holds an excellent collection of plesiosaur material from the Oxford Clay brick pits in the area. The most complete known specimen of the long-necked plesiosaur CryptoclidusCryptoclidus

Cryptoclidus was a marine reptile of the plesiosaur family from the Middle Jurassic Period in England....
, excavated in the 1980s can be seen there.

Description

Plesiosaurs had a broad body and a short tailTail Summary

A tail is the section at the rear end of an animal's body, the term particularly referring to such a section which forms a d...
. They retained their ancestral two pairs of limbs, which evolved into large flipperFlipper (anatomy)

A flipper is a digitless, typically flat limb evolved for movement through water....
s. Plesiosaurs evolved from earlier, similar forms such as pistosaursPistosaurus

Pistosaurus longaevus is an extinct genus of aquatic sauropterygian reptile belonging to the plesiosaur order....
 or very early, longer-necked pliosaurPliosaur

The Pliosaurs were aquatic mesozoic reptiles, from the Jurassic and Cretaceous Periods....
s. There are a number of familiesFamily (biology)

In biological classification, family is 1) a rank or 2) a taxon in that rank....
 of plesiosaurs, which retain the same general appearance and are distinguished by various specific details. These include the Plesiosauridae, unspecialised types which are limited to the Early JurassicEarly Jurassic

The Early Jurassic is the earliest of three epochs of the Jurassic period....
 period; CryptoclididaeCryptoclididae

Cryptoclididae is a family of medium size plesiosaurs from the Middle Jurassic to the Late Cretaceous....
, (e.g. CryptoclidusCryptoclidus

Cryptoclidus was a marine reptile of the plesiosaur family from the Middle Jurassic Period in England....
), with a medium-long neck and somewhat stocky build; ElasmosauridaeElasmosauridae

Elasmosauridae was the taxonomic family of the most advanced plesiosaurs....
, with very long, inflexible necks and tiny heads; and the CimoliasauridaeCimoliasauridae

The Cimoliasauridae are a poorly known family of plesiosaurs from the Jurassic and Cretaceous....
, a poorly known group of small Cretaceous forms. According to traditional classifications, all plesiosaurs have a small head and long neck but, in recent classifications, one short-necked and large-headed Cretaceous group, the PolycotylidaePolycotylidae

Polycotylidae is a family of plesiosaurs from the Cretaceous, a sister group to the elasmosauridae....
, are included under the Plesiosauroidea, rather than under the traditional Pliosauroidea. Size of different plesiosaurs varied significantly, with an estimated length of TrinacromerumTrinacromerum Overview

Trinacromerum is an extinct genus of sauropterygian reptile belonging to the pliosaur suborder. ...
being 3 meters and MauisaurusMauisaurus

Mauisaurus was a genus of plesiosaur that lived during the Late Cretaceous period around 65 million years ago in what i...
growing to 20 meters.

Behaviour

Unlike their pliosaurian cousins, plesiosaurs (with the exception of the Polycotylidae) were probably slow swimmers . It is likely that they cruised slowly below the surface of the water, using their long flexible neck to move their head into position to snap up unwary fish or cephalopods. Their four-flippered swimming adaptation may have given them exceptional maneuverability, so that they could swiftly rotate their bodies as an aid to catching prey.

Contrary to many reconstructions of plesiosaurs, it would have been impossible for them to lift their head and long neck above the surface, in the 'swanSwan

Swans are large water birds of the family Anatidae, which also includes geese and ducks....
-like' pose that is often shown . Even if they had been able to bend their necks upward to that degree (which they could not), gravity would have tipped their body forward and kept most of the heavy neck in the water.

Taxonomy

The classification of plesiosaurs has varied; the following represents one version (see O'Keefe 2001)


  • Superorder SAUROPTERYGIASauropterygia

    Sauropterygia is a group of very successful aquatic reptiles that flourished during the Age of the Dinosaurs before they bec...
    • Order PLESIOSAURIAPlesiosauria

      Plesiosauria are an order of Mesozoic marine reptiles....
      • Suborder PliosaurPliosaur

        The Pliosaurs were aquatic mesozoic reptiles, from the Jurassic and Cretaceous Periods....
        oidea
      • Suborder Plesiosauroidea(Gray, 1825) Welles, 1943 sensu O'Keefe, 2001
        • Plesiopterys O'Keefe, 2004
        • Family PlesiosauridaePlesiosaurus

          Plesiosaurus was a large, marine Sauropterygian reptile that lived during the early part of the Jurassic period, and is ...
           Gray, 1825 sensu O'Keefe, 2001
          • AttenborosaurusAttenborosaurus Overview

            Attenborosaurus is an extinct genus of plesiosaur from the Early Jurassic of Dorset, England....
            Bakker, 1993
          • PlesiosaurusPlesiosaurus

            Plesiosaurus was a large, marine Sauropterygian reptile that lived during the early part of the Jurassic period, and is ...
            De la Beche & Conybeare, 1821
        • (Unranked) Euplesiosauria O'Keefe, 2001
          • ? Sthenarosaurus Watson, 1911 (nomen dubium)
          • ? Eretmosaurus Seeley, 1874
          • ? LeurospondylusLeurospondylus

            Leurospondylus is a genus of plesiosaur whose family is not known for certain, but is thought to be Plesiosauridae....
            Brown, 1913
          • ? NichollsiaNichollsia (plesiosaur)

            Nichollsia is an extinct genus of plesiosaur from the Early Cretaceous Boreal Sea of North America....
            Druckenmiller & Russell, 2008
          • Superfamily Cryptoclidoidea Williston, 1925 sensu O'Keefe, 2001
            • Family CryptoclididaeCryptoclididae

              Cryptoclididae is a family of medium size plesiosaurs from the Middle Jurassic to the Late Cretaceous....
               Williston, 1925 sensu O'Keefe, 2001
              • ? Tatenectes O’Keefe & Wahl, 2003
              • ? ColymbosaurusColymbosaurus

                Colymbosaurus is a genus of English plesiosaur described in 1874 by Seeley....
                Seeley, 1874
              • Cryptocleidus Seeley, 1892
              • MuraenosaurusMuraenosaurus Summary

                Muraenosaurus is an extinct genus of sauropterygian reptile belonging to the plesiosaur order....
                Seeley, 1874
              • Pantosaurus Marsh, 1891
              • VinialesaurusVinialesaurus

                Vinialesaurus is an extinct genus of plesiosaur from the Late Jurassic of what is now Cuba....
                Gasparini, Bardet & Iturralde-Vinent, 2002
            • (Unranked) Tricleidia O'Keefe, 2001
              • Family Tricledidae Nova
                • Tricleidus Andrews, 1909
              • Family CimoliasauridaeCimoliasauridae

                The Cimoliasauridae are a poorly known family of plesiosaurs from the Jurassic and Cretaceous....
                 Delair, 1959 sensu O'Keefe, 2001
                • ? AristonectesAristonectes

                  Aristonectes is an extinct genus of plesiosaur from the Late Cretaceous of what is now South America and Antarctica....
                  Cabrea, 1941
                • KaiwhekeaKaiwhekea

                  Kaiwhekea is an extinct genus of plesiosaur from the Late Cretaceous of what is now New Zealand....
                  Cruickshank & Fordyce, 2002
                • KimmerosaurusKimmerosaurus

                  Kimmerosaurus is an extinct genus of plesiosaur from the family Cimoliasauridae. ...
                  Brown, 1981
                • Cimoliasaurus Leidy, 1851 (nomen dubium)
              • Family PolycotylidaePolycotylidae

                Polycotylidae is a family of plesiosaurs from the Cretaceous, a sister group to the elasmosauridae....
                 Williston, 1909 sensu O'Keefe, 2001
                • ? EdgarosaurusEdgarosaurus

                  Edgarosaurus is a genus of polycotylid plesiosaur, containing one species, E....
                  Druckenmiller, 2002
                • ? Georgiasaurus Otschev, 1978
                • ManemergusManemergus

                  Manemergus is a genus of polycotylid plesiosaur from the Late Cretaceous of Morocco....
                  Buchy, Metayer, & Frey, 2005
                • Polycotylus Cope, 1869
                • DolichorhynchopsDolichorhynchops

                  Dolichorhynchops is a genus of polycotylid plesiosaur from the Late Cretaceous of North America, containing two species,...
                  Willison, 1903
                • TrinacromerumTrinacromerum

                  Trinacromerum is an extinct genus of sauropterygian reptile belonging to the pliosaur suborder. ...
                  Cragin, 1888
                • SulcusuchusSulcusuchus

                  Sulcusuchus is a genus of polycotylid plesiosaur from the Late Cretaceous of Argentina....
                  Gasparini & Spalletti, 1990
                • ThililuaThililua

                  Thililua is a genus of polycotylid plesiosaur, containing one species, T....
                  Bardet, Pereda Suberbiola & Jalil, 2003
              • Family ElasmosauridaeElasmosauridae

                Elasmosauridae was the taxonomic family of the most advanced plesiosaurs....
                 Cope, 1869 sensu Bardet, Godefroit & Sciau, 1999
                • ? MorenosaurusMorenosaurus Overview

                  Morenosaurus is an extinct genus of plesiosaur from the Cretaceous of what is now California....
                  Welles, 1943
                • OccitanosaurusOccitanosaurus

                  Occitanosaurus is an extinct genus of plesiosaur from the Early Jurassic of what is now France....
                  Bardet, Godefroit & Sciau, 1999
                • MicrocleidusMicrocleidus

                  Microcleidus is an extinct genus of sauropterygian reptile belonging to the plesiosaur suborder....
                  Watson, 1911
              • Family ElasmosauridaeElasmosauridae

                Elasmosauridae was the taxonomic family of the most advanced plesiosaurs....
                 Cope, 1869 sensu O'Keefe, 2001
                • ? FutabasaurusFutabasaurus

                  Futabasaurus suzukii is the name of a plesiosaur that was described in 2006 by Soto, Hagesawa, and Manabe....
                  Sato, Hasegawa & Manabe, 2006
                • ? Orophosaurus Cope, 1887 (nomen dubium)
                • ? WoolungasaurusWoolungasaurus

                  Woolungasaurus glendowerensis was a plesiosaur, an extinct marine reptile, of the family Elasmosauridae....
                  Persson, 1960
                • ? Ogmodirus Williston & Moodie, 1913 (nomen dubium)
                • ? FresnosaurusFresnosaurus

                  Fresnosaurus is an extinct genus of plesiosaur from the Late Cretaceous of what is now California....
                  Welles, 1943
                • ? Piptomerus Cope, 1887 (nomen vanum)
                • ? Goniosaurus Meyer, 1860
                • ? MauisaurusMauisaurus

                  Mauisaurus was a genus of plesiosaur that lived during the Late Cretaceous period around 65 million years ago in what i...
                  Hector, 1874
                • ? AphrosaurusAphrosaurus

                  Aphrosaurus is an extinct genus of plesiosaur from the Mesozoic....
                  Welles, 1943
                • ? HydrotherosaurusFacts About Hydrotherosaurus

                  Hydrotherosaurus is an extinct genus of sauropterygian reptile belonging to the plesiosaur order. ...
                  Welles, 1943
                • ? Hydralmosaurus Welles, 1943
                • ? TerminonatatorTerminonatator

                  Terminonatator is a genus of elasmosaurid plesiosaur from the Late Cretaceous of Saskatchewan, Canada....
                  Sato, 2003
                • ? TuarangisaurusTuarangisaurus

                  Tuarangisaurus is a genus of extinct elasmosaur discovered in New Zealand and described by Wiffen & Moisley in 1986, kn...
                  Wiffen & Moisley, 1986
                • ? Thalassomedon Welles, 1943
                • ElasmosaurusElasmosaurus Summary

                  Elasmosaurus meaning "thin-plated lizard" because it had platelike bones in its pelvic girdle is a plesiosaur with an extrem...
                  Cope, 1869
                • BrancasaurusBrancasaurus

                  Brancasaurus is an extinct genus of plesiosaur from the Early Cretaceous of what is now Germany....
                  Wegner, 1914
                • CallawayasaurusCallawayasaurus

                  Callawayasaurus is a genus of plesiosaur from the family, Elasmosauridae....
                  Carpenter, 1999
                • LibonectesLibonectes

                  Libonectes is an extinct genus of sauropterygian reptile belonging to the plesiosaur order....
                  Carpenter, 1997
                • StyxosaurusStyxosaurus

                  Styxosaurus is a genus of plesiosaur of the family Elasmosauridae....
                  Welles, 1943

In popular culture

The plesiosaur is popular among children and cryptozoologists, appearing in a number of children's books and several filmFacts About Film

Film is a term that encompasses motion pictures as individual projects, as well as the field in general....
s, including in Jules VerneJules Verne

Jules Gabriel Verne was a French author and a pioneer of the science-fiction genre....
's novel Journey to the Center of the EarthJourney to the Center of the Earth

Journey to the Center of the Earth is a classic 1864 science fiction novel by Jules Verne....
. However, in Verne's story it is described as being much larger than they were in reality, and shown as having a shell like a turtleTurtle

Turtles are reptiles of the order Testudines , most of whose body is shielded by a special bony or cartilagenous shell...
. In the bizarre 1899 short story "The Monster of Lake LaMetrie", a man's brain was put into the body of a plesiosaur.

Plesiosaurs have appeared in films about lake monsterLake monster

Lake monster is the name given to large unknown animals which have purportedly been sighted in, and/or are believed to dwell...
s, including Magic in the WaterMagic in the Water

"Magic in the Water" is a movie about a girl named Ashley and her brother Joshua who are taken by their workaholic dad named Jack ...
(1995), and movies about the Loch Ness MonsterLoch Ness Monster

The Loch Ness Monster, sometimes called Nessie or Ness is a mysterious and unidentified animal or group of anim...
, such as Loch NessLoch Ness (film)

Loch Ness is a 1996 film that stars Ted Danson and Joely Richardson....
(1996). In both films, the creature primarily serves as a symbolSymbol

A symbol, in its basic sense, is a conventional representation of a concept; i.e., an idea, object, quality, quantity, etc....
 of a lost, child-like sense of wonder. Plesiosaurs are also present in the Japanese JawsJaws (film)

Jaws is a 1975 horror thriller film directed by Steven Spielberg, based on Peter Benchley's best-selling novel of the sa...
-inspired movie Legend of the Dinosaurs (1983).

Contrary to reports, the long-necked, sharp-toothed animal in the classic film King KongKing Kong

King Kong is the name of the fictional giant ape, from Skull Island, who has appeared in several works, most of which bear h...
(1933), which flips a raft full of rescuers on their way to save Fay WrayFay Wray Summary

Vina Fay Wray was a Canadian–American actress. ...
, and then devours the swimmers, is not a plesiosaur. Despite striking a profile in the mist very similar to the famous 'Surgeon's Photo' of the Loch Ness Monster, it then chases the routed heroes onto dry land, where it is clearly intended to be a diplodocidDiplodocid

Diplodocids, or members of the family Diplodocidae, were sauropod dinosaurs such as the Diplodocus and the Apato...
 sauropod. However, Kong later battles a serpent-like creature in a cave which possesses four flippers, resembles a plesiosaur, but acts more like a giant snake.

Alleged living plesiosaurs

Lake or sea monsterFacts About Sea monster

Sea monsters are sea-dwelling, mythical or legendary creatures, often believed to be of immense size....
 sightings are occasionally explained by cryptozoologistsCryptozoology

Cryptozoology is the study of animals that are rumored to exist, but for which conclusive proof is still missing; the term a...
 as plesiosaurs. With the lack of fossil evidence for plesiosaurs surviving past the K/T boundaryK–T boundary Summary

The K-T boundary is a geological signature, usually a thin band, dated to 65.5 ? 0.3 ....
, the discovery of real and even more ancient living fossilLiving fossil

Living fossil is a term for any living species of organism which seems to be the same as a species otherwise only known from...
s, such as the coelacanthCoelacanth

Coelacanth is the common name for an order of fish that includes the oldest living lineage of jawed fish known to date....
, and of previously unknown but enormous deep-sea animals such as the giant squidFacts About Giant squid

Giant squid, once believed to be mythical creatures, are squid of the Architeuthidae family, represented by as many as...
 and the megamouth sharkMegamouth shark Summary

The megamouth shark, Megachasma pelagios, is an extremely rare and unusual species of shark, discovered in 1976, with 36...
, have fuelled imaginations.

The 1977 discovery of a carcass with flippers and what appeared to be a long neck and head, by the JapanJapan

is an island country in East Asia. Located in the Pacific Ocean, it lies to the east of China, Korea, and Russia, stretching from...
ese fishingFishing

Fishing is the activity of hunting for fish....
 trawler Zuiyo MaruZuiyo Maru

The Zuiyo Maru was a Japanese trawler that caught a creature initially claimed to be a prehistoric plesiosaur off the co...
, off New ZealandNew Zealand

New Zealand is a country in the south-western Pacific Ocean consisting of two large islands and many much smaller islands, m...
, created a plesiosaur craze in Japan. However, the consensus amongst scientists today is that it was a decayed basking sharkBasking shark Summary

The basking shark, Cetorhinus maximus, is the second largest fish, after the whale shark....
.

The Loch Ness MonsterLoch Ness Monster

The Loch Ness Monster, sometimes called Nessie or Ness is a mysterious and unidentified animal or group of anim...
, and other lake monsters, have been reported to resemble plesiosaurs. The lake plesiosaur theory is considered unlikely for many reasons, including: they are generally too cold for a large cold-bloodedCold-blooded

Cold-blooded organisms maintain their body temperatures in ways different from mammals and birds....
 animal to survive easily, and that air-breathing animals, like plesiosaurs, would be easily spotted when they surface to breathe. In 2003, the National Museums of ScotlandNational Museums of Scotland

The National Museums of Scotland are the national museums of Scotland. ...
 confirmed that vertebraVertebra

Vertebrae are the individual irregular bones that make up the vertebral column — a flexuous and flexible column....
e discovered on the shores of Loch NessLoch Ness

This page is about the body of water in Scotland....
 belong to a plesiosaur, but the fossilFossil

Fossils are the mineralized or otherwise preserved remains or traces of animals, plants, and other organisms....
s were deliberately planted (BBC News, July 16, 2003).

Research announced in 2006, by Leslie Noč of the Sedgwick Museum in Cambridge, UK, cast further doubt on the lake plesiosaur theory. While many sightings of the Loch Ness Monster, and similar from around the globe, include reports of it lifting its head out of the water, Noč's study of fossilized vertebrae of MuraenosaurusMuraenosaurus

Muraenosaurus is an extinct genus of sauropterygian reptile belonging to the plesiosaur order....
concluded this articulation would not be possible. Instead, he found that the neck evolved to point downwards allowing the plesiosaur to feed on soft-shelled animals living on the sea floor.

Beached carcasses that prove controversial or hard to identify, a phenomenon known as globsterGlobster

A globster is an unidentified carcass washed up on the shore of an ocean or other body of water, or found in the stomach of ...
s, have fueled the speculation about living plesiosaurs. For example, The StarFacts About The Star (Malaysia)

The Star is the leading English-language newspaper in Malaysia....
 on April 8, 2006, reported that fishermen discovered bones resembling that of a plesiosaur near SabahSabah Summary

Sabah is the second largest state in Malaysia and is also known as Negeri di bawah bayu which means The Land Below The...
, MalaysiaMalaysia

Malaysia is a federation of 13 states in Southeast Asia, formed in 1963....
. A team of researchers from Universiti Malaysia SabahUniversiti Malaysia Sabah Overview

Universiti Malaysia Sabah is a Malaysian university located in Kota Kinabalu, Sabah, Malaysia and was established on Novembe...
 investigated the specimen, but determined the bones were those of a whale .

See also

  • Australian plesiosaursAustralian plesiosaurs

    The following is a list of members of the Plesiosauria that have been identified in Australia....


External links

  • . Richard Forrest.
  • . Adam Stuart Smith.
  • . Raymond Thaddeus C. Ancog.
  • . Mike Everhart.
  • . Mike Everhart.
  • . Mike Everhart and other contributors.
  • "". Somersert Museums County Service. (best known fossil)
  • "". Allan Hall and Mark Henderson. Times Online, December 30, 2002. (Monster of Aramberri)
  • "". BBC News, July 16, 2003. (Loch Ness, possible hoax)
  • "". Glen J. Kuban.
  • "". Internet reference to article.
  • .
  • - NET Television
  • , from the National Science Foundation, December 6, 2006.