Plesiosaur by Walter Colvin

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3d art render of a Plesiosaur up from the murky depths to feed.
Made with Bryce 3d.

Plesiosaurs were carnivorous aquatic (mostly marine) reptiles. After their discovery, they were somewhat fancifully said to have resembled “a snake threaded through the shell of a turtle”, although they had no shell. The common name ‘plesiosaur’ is applied both to the ‘true’ plesiosaurs (Suborder Plesiosauroidea) which includes both long-necked (elasmosaurs) and short-necked (polycotylid) forms and to the larger taxonomic rank of Plesiosauria, which includes the pliosaurs. The pliosaurs were the short-necked, large-headed plesiosaurians that were the apex predators for much of the Mesozoic. There were many species of plesiosaurs, while most of them were not as large as Elasmosaurus.

Plesiosaurs (sensu Plesiosauroidea) appeared at the start of the Jurassic Period and thrived until the K-T extinction, at the end of the Cretaceous Period. While they were Mesozoic reptiles that lived at the same time as dinosaurs, they were not dinosaurs.

Plesiosaurs had a broad body and a short tail. They retained their ancestral two pairs of limbs, which evolved into large flippers. Plesiosaurs evolved from earlier, similar forms such as pistosaurs or very early, longer-necked pliosaurs. There are a number of families 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 Jurassic period; Cryptoclididae, (e.g. Cryptoclidus), with a medium-long neck and somewhat stocky build; Elasmosauridae, with very long, inflexible necks and tiny heads; and the Cimoliasauridae, 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 Polycotylidae, are included under the Plesiosauroidea, rather than under the traditional Pliosauroidea. Size of different plesiosaurs varied significantly, with an estimated length of Trinacromerum being 3 meters and Mauisaurus growing to 20 meters.

Unlike their pliosaurian cousins, plesiosaurs (with the exception of the Polycotylidae) were probably slow swimmers {Massare, 1988}. 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 ‘swan-like’ pose that is often shown {Everhart, 2005; Henderson, 2006}. 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.

From Wikipedia, the free Internet encyclopedia.

Comments

  • JacquiK
    JacquiKover 5 years ago

    Great work Walter.

  • Thank you very much Jacqui

    – Walter Colvin

  • THank you very much Jacqui

    – Walter Colvin

  • Dawnsky2
    Dawnsky2over 5 years ago

    fab work Walter :)

  • Thank very muchDawn.

    – Walter Colvin

  • WayoftheWarrior
    WayoftheWarriorover 5 years ago

    Great work

  • Thank you Tony.

    – Walter Colvin

  • LoneAngel
    LoneAngelover 5 years ago

    wonderful image

  • Thank you Angel

    – Walter Colvin

  • Antanas
    Antanasover 5 years ago

    lovely work

  • THank you Antanas.

    – Walter Colvin

  • Anita Inverarity
    Anita Inverarityover 5 years ago

    Wow- Love this, they thought the Loch Ness Monster may be one of these beasties xxxxxxx

  • THank you Anita, I got the info from Wikipedia, and the said the same thing.

    – Walter Colvin

  • Keith Reesor
    Keith Reesorover 5 years ago

    Superb creation Walter!!
    Love how you water turns murkier the deeper it goes!! :)

  • Thank you Kreesor, I read some were that they would hide in merky water and wait for their pray.

    – Walter Colvin

  • Damian
    Damianover 5 years ago

    Love prehistoric art, and my favs are always marine reptiles :)

  • Thank you very much Damian. I plan to do a few more prehistoric marine images here in the near future.

    – Walter Colvin

  • Mia1
    Mia1over 5 years ago

    Beautiful work :o)

  • Thank you very much my friend.

    – Walter Colvin

  • Erik Schlogl
    Erik Schloglover 5 years ago

    Beautiful artwork – very realistic “limited visibility” underwater effect!

  • THank you very much Erik.

    – Walter Colvin

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