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Suuwassea (meaning "ancient thunder") is a genus of dicraeosaurid sauropod dinosaur found in the Upper Jurassic strata of the Morrison Formation, located in southern Carbon County, Montana, USA. The fossil remains were recovered in a series of expeditions during a period spanning the years 1999 and 2000, described by J.D. Harris and Peter Dodson in 2004. They consist of a disarticulated but associated partial skeleton, including partial vertebral series and limb bones.

File:Suuwassea emiliae3.JPG



Since the fossil was found in an ancestral territory of the Native American Crow tribe, the etymology of the generic name is derived from a term in their language, suuwassa, “the first thunder heard in spring”. The root suu, meaning “thunder” and wassa, “ancient”, are a nod to the “thunder lizard” moniker often applied to sauropods. The specific descriptor honours the deceased sponsor of the expeditions that recovered the fossil.


Suuwassea is a dicraeosaurid, estimated to have been 14 to 15 meters long (46 to 49 ft), characterized by skull and axial skeleton features it shares with Diplodocidae and Dicraeosauridae though it is too primitive to pertain to any of the latter clades. The herbivore differs from dicraeosaurids in the unfused state of the frontal, and from diplodocids in the arrangement of bones around the foramen magnum, though it possesses a greater number of similarities with the latter than with clade Dicraeosauridae.

Taxonomy and classification[]

In the original description, Suuwassea was placed at Flagellicaudata incertae sedis due to the mosaic of primitive and derived characters found in both dicraeosaurids and diplodocids. Later phylogenetic analysis placed it as a member of the diplodocid subfamily Apatosaurinae,[1] but subsequent studies recovered it as the only North American member of Dicraeosauridae.[2][3]


  1. Lovelace, David M.; Hartman, Scott A.; Wahl, William R. (2008). "Morphology of a specimen of Supersaurus (Dinosauria, Sauropoda) from the Morrison Formation of Wyoming, and a re-evaluation of diplodocid phylogeny". Arquivos do Museu Nacional 65 (4): 527–544.
  2. Whitlock, J.A. (2011). "A phylogenetic analysis of Diplodocoidea (Saurischia: Sauropoda)." Zoological Journal of the Linnean Society, Article first published online: 12 Jan 2011. doi:10.1111/j.1096-3642.2010.00665.x
  3. Tschopp, E.; Mateus, O. V.; Benson, R. B. J. (2015). "A specimen-level phylogenetic analysis and taxonomic revision of Diplodocidae (Dinosauria, Sauropoda)". PeerJ 3: e857. doi:10.7717/peerj.857. edit


  • Harris, J.D. and Dodson, P. (2004). "A new diplodocoid sauropod dinosaur from the Upper Jurassic Morrison Formation of Montana, USA." Acta Palaeontologica Polonica 49 (2): 197–210.