[named after the mythical spirit of a giant rattlesnake].
Named By: Emily J. Lessner, Michelle R. Stocker, Nathan D. Smith, Alan H. Turner, Randall B. Irmis & Sterling J. Nesbitt - 2016.
Classification: Chordata, Reptilia, Archosauria, Paracrocodylomorpha, Loricata, Rauisuchidae.
Species: V. haydeni (type).
Size: Uncertain due to lack of fossil remains, but comparison to other genera reveals a rough estimate of between 3-3.5 meters long for the holotype individual.
Known locations: USA, New Mexico - Chinle Foramtion [Petrified Forest Member].
Time period: Norian of the Triassic.
Fossil representation: Fragmentary jaw and hip bones.
fossils of Vivaron were first discovered in
2009, however they were
at first thought to represent further remains of the famous
The addition of two prong-like projections to the rear
of the maxilla which connect to the jugal have actually revealed that
these fossils do not belong to Postosuchus, but
a different genus of
The discovery of a new genus in this part of the Chinle Formation has already raised the question of other rausuchian fossils discovered here which have often been associated with Postosuchus simply by association of animal type. A second rausuchian genus active at the same time as Postosuchus also suggests to a more diverse Triassic ecosystem in this part of North America, one capable of supporting two genera of large predators.
- A new rauisuchid (Archosauria, Pseudosuchia) from the Upper Triassic (Norian) of New Mexico increases the diversity and temporal range of the clade. - PeerJ. 4. - Emily J. Lessner, Michelle R. Stocker, Nathan D. Smith, Alan H. Turner, Randall B. Irmis & Sterling J. Nesbitt - 2016.