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Alamosaurus sizes



This is a diagram I came up with showing the various sizes of purported individuals of the saltasaurid titanosaur Alamosaurus.

The largest individual (at just under 27 meters and about 74 tonnes) is based solely on an incomplete tibia that would have been about 170 cm long, discribed by Rivera-Sylva et al. in 2006. The smallest individual (at under 8 meters and less than 2 tonnes) is based on a partially complete specimen described by Lehman and Coulson in 2002.

The second largest specimen to second smallest specimen pictured are based off of, in order, incomplete individuals described by Fowler and Sullivan (2011), undescribed specimen housed at the Perot Museum of Nature & Science, a partial sacrum mentioned by Mateer (1976) and the specimen described by Charles Gilmore (1946). All sizes are approximate due to the fragmentary nature of the specimens, and are subject to revision upon discovery of more complete specimens.


Gilmore, C.W. 1946. Reptilian fauna of the North Horn Formation of central Utah. U.S. Geological Survey Professional Paper 210−C: 29–51.

RIVERA-SYLVA, GUZMAN-GUTIÉRREZ, & PALOMINO-SÁNCHEZ. Preliminary Report on a vertebrate fossil assemblage from the Late Cretaceous of Chihuahua, Mexico. HANTKENIANA 5 (2006)

Fowler, D. W., and R. M. Sullivan. 2011. The first giant titanosaurian sauropod from the Upper Cretaceous of North America. Acta Palaeontologica Polonica 56 (4).

Lehman, T.M. and Coulson, A.B. 2002. A juvenile specimen of the sauropod dinosaur Alamosaurus sanjuanensis from the Upper Cretaceous of Big Bend National Park, Texas. Journal of Paleontology 76: 156–172.

Mateer, N. 1976. New topotypes of Alamosaurus sanjuanensis Gilmore (Reptilia: Sauropoda). Bulletin of the Geological Institutions of the University of Uppsala, New Series 6:93–95.
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cruzzwnt's avatar

If you remake this stuff in future, should be put t-rex (Scotty) for comparisonsorz is better.