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Temporal range: Late Triassic,
Tanytrachelos specimen VMNH.jpg
A specimen of Tanytrachelos
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Clade: Archosauromorpha
Family: Tanystropheidae
Genus: Tanytrachelos
Olsen, 1979
Type species
Tanytrachelos ahynis
Olsen, 1979
A "type A" Tanytrachelos, believed to be a female.

Tanytrachelos is an extinct genus of tanystropheid archosauromorph reptile from the Late Triassic of the eastern United States.[1] It contains a single species, Tanytrachelos ahynis, which is known from several hundred fossil specimens preserved in the Solite Quarry in Cascade, Virginia. Abundant fossils of Tanytrachelos are found in a series of lakebed sediments that were deposited over the course of about 350 thousand years in a lake which existed approximately 230 million years ago. Some fossils are very well-preserved and include the remains of soft tissues.[2][3]

Tanytrachelos remains have also been found in the Chinle Formation of Arizona[4] and the Lockatong Formation of New Jersey.[5]


  1. ^ Olsen, Paul E. (1979). "A New Aquatic Eosuchian from the Newark Supergroup (Late Triassic-Early Jurassic) of North Carolina and Virginia" (PDF). Postilla (176).
  2. ^ Casey, M. M.; Fraser, N. C.; Kowalewski, M. (2007). "Quantitative Taphonomy of a Triassic Reptile Tanytrachelos ahynis from the Cow Branch Formation, Dan River Basin, Solite Quarry, Virginia". PALAIOS. 22 (6): 598. doi:10.2110/palo.2006.p06-010r.
  3. ^ Smith, Amy C. (11 April 2011). "Description of Tanytrachelos ahynis and its implications for the phylogeny of Protorosauria". Dissertation.
  4. ^ Irmis, Randall B. (2005). The vertebrate fauna of the Upper Triassic Chinle Formation in northern Arizona (PDF). Mesa Southwest Museum. pp. 63–88. Archived from the original (PDF) on 2012-10-04.
  5. ^ Schein, Jason P.; Parris, David C.; Pellegrini, Rodrigo (2010). "A complete and articulated Tanytrachelos ahynis (Reptilia: Protorosauroidea) from the Late Triassic Lockatong Formation of northern New Jersey, U.S.A."