<p>Image: A Dolichorhynchops</p>

Because Dolichorhynchops swallowed its prey whole but could only gulp small prey, it probably had to eat a lot of fish to get the energy it needed to survive the Cretaceous seas.

Copyright © MMVII NGHT, Inc.

Fast Facts

Up to 15 ft (4.6 m)
Did you know?
Modern mammals, including humans and giraffes, have seven neck vertebrae. Dolichorhynchops had more than 20.
Size relative to a 6-ft (2-m) man

Please add a "relative" entry to your dictionary.

Dolichorhynchops was a short-necked plesiosaur that used long, paddle-like flippers to fly through the water like a penguin. The marine reptiles were quick and agile underwater acrobats, with large eyes well adapted to spying small prey. Long, narrow jaws filled with 30 to 40 sharp teeth in a single row allowed Dolichorhynchops to grab its prey but not cut it. Instead, the captured fish were swallowed whole.

Dolichorhynchops grew 12 to 15 feet (4 to 5 meters) long and was probably covered in smooth skin. Its winglike paddles were constructed of almost a hundred tightly packed bones, making them too stiff for use on land but excellent for swimming fast. Though the creatures may have been able to dive deeply in search of prey, the need to breathe air meant most of their time was spent near the water's surface.

The short-necked plesiosaur likely had few enemies, but those that attacked were some of the fiercest monsters of the seas, including sharks with razor-sharp teeth and the giant mosasaur Tylosaurus. One famous Tylosaurus fossil contains the remains of a juvenile Dolichorhynchops inside. And Dolichorhynchops fossils have been found with unborn babies inside, strong evidence they gave birth to live young.

Prehistoric Features

  • Photo: Gully bones

    Digging Up Sea Monsters

    Follow the blog from the Spitsbergen Expedition as they unearth "sea monsters″ from the Upper Jurassic Period 150 million years ago.

  • <p>Image: A bacculite</p>

    Photo Gallery: Sea Monsters

    Get a glimpse of what prehistoric sea creatures may have looked like millions of years ago.

  • Photo: A Dimorphodon flies across the forest in a scene from the movie Flying Monsters 3D

    Flying Monsters 3D

    Could flying monsters have existed? With cutting-edge 3-D filming technology and CGI, Flying Monsters 3D recreates spectacular pterosaurs and brings these giant flying creatures to life.

  • <p>2565.jpg</p>

    Bizarre Dinosaurs

    A bizarre gallery of Mesozoic monsters prompts John Updike to ask: What has evolution wrought?

Animals A-Z

Animals A-Z