(Terrible headed lizard).
Named By: Li - 2003.
Classification: Chordata, Reptilia, Diapsida, Archosauromorpha, Prolacertiformes, Tanystropheidae.
Species: D. orientalis.
Size: 3 meters long.
Known locations: China, Guizhou Province.
Time period: Ladinian of the Triassic.
Fossil representation: Initially a skull, A second specimen included much of the post cranial skeleton.
superficially similar to Tanystropheus,
appears to be
more suited to aquatic hunting. Key evidence for this is the fact that
the legs were not as well developed as the other protorosaurs that were
land dwelling creatures. The
eyes on the skull point
upward suggesting that Dinocephalosaurus approached
its prey from below
before striking. The neck at twenty-five vertebrae was actually longer
body and had two ribs on either side that had muscle attachments to
Study of the skeleton has revealed a potentially unique method of hunting. Whereas many aquatic hunters create an underwater suction effect by rapidly opening their mouths, Dinocephalosaurus appears to have flexed open its neck ribs. This would have greatly increased the volume and power of intake, significantly reducing the ability of prey items to escape. An alternative theory is that the vertebra ribs and muscles, which are also seen in some terrestrial protorosaurs, served purely a support purpose. This would suggest a genetic throwback to a common possibly terrestrial ancestor, and may have served to support the neck in times that Dinocephalosaurus left the water.
- First record of protorosaurid reptile (Order Protorosauria) from the Middle Triassic of China. - Acta Geologica Sinica 77:419-423. - C. Li - 2003.
- A Triassic Aquatic Protorosaur with an Extremely Long Neck. - Sciene - Chun Li, Olivier Rieppel & Michael C. LaBarbera - 2004.
- The Skeletal Anatomy of the Triassic Protorosaur Dinocephalosaurus orientalis Li, from the Middle Triassic of Guizhou Province, Southern China. - Journal of Vertebrate Paleontology - O. Rieppel - 2008.