Temporal range: Late Pliocene to Pleistocene
|S. mirificus fossil at the Smithsonian natural history museum|
Stegomastodon ('roof breast tooth') is an extinct genus of gomphothere, a family of proboscideans. It is not to be confused with the genus Mammut from a different proboscidean family, whose members are commonly called "mastodons", nor with the genus Stegodon, from yet another proboscidean subfamily, whose members are commonly called "stegodonts".
Stegomastodon mirificus is known from NMNH 10707, a 30-year-old male known from most of a skeleton. It was 2.6 metres (8.5 ft) tall, with a weight around 4.7 tonnes (4.6 long tons; 5.2 short tons). Like modern elephants, but unlike most of its closer relatives, it had just two tusks. These tusks curved upward and were about 3.5 metres (11.5 ft) long. Stegomastodon's molars were covered in enamel and had a complex pattern of ridges and knobbly protrusions on them, giving the creature a large chewing surface that enabled it to eat grass. Its brain weighed about 11 pounds (5 kg).
It lived in North and South America. The two South American species arrived following the Great American Interchange. They were initially mixed feeders; S. waringi evolved toward grazing, while S. platensis evolved toward browsing. The Stegomastodon species occupied warmer, lower-altitude habitats east of the Andes, while the related gomphothere Cuvieronius hyodon occupied cooler, higher-altitude habitats. It has been C14 dated to as recently as 6,060 BP in Yumbo, Valle del Cauca, Colombia. 
- Larramendi, A. (2015). "Shoulder height, body mass and shape of proboscideans" (PDF). Acta Palaeontologica Polonica 60. doi:10.4202/app.00136.2014.
- Prado, J. L.; Alberdi, M. T.; Azanza, B.; Sánchez, B.; Frassinetti, D. (2005). "The Pleistocene Gomphotheriidae (Proboscidea) from South America". Quaternary International. 126-128: 21–30. Bibcode:2005QuInt.126...21P. doi:10.1016/j.quaint.2004.04.012.
- Rodríguez-Flórez, Carlos David; Ernesto León Rodríguez-Flórez y Carlos Armando Rodríguez (2009). "Revision of Pleistocenic Gomphotheriidae Fuana in Columbia and case report in the Department of Valle Del Cauca" (PDF). Scientific Bulletin (Museum Center - Natural History Museum) 13 (2): 78–85. Retrieved 2010-11-09.
- Correal, Gonzalo; Thomas van der Hammen (2003). "Supervivencia de Mastodontes, Megaterios y presencia del hombre en el vale del Magdalena(COLOMBIA) entre 6000 y 5000 AP." (PDF). Revista de la Academia Colombiana de Ciencias Exactas, Físicas y Naturales (Academia Colombiana) 27 (103): 159–164. Retrieved 2010-11-09.
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