Temporal range: Middle-Late Miocene
Synthetoceras was named by Stirton (1932). It is the type genus of Synthetoceratinae, Synthetoceratini. It was assigned to Protoceratidae by Stirton (1932), Thurmond and Jones (1981) and Carroll (1988); to Synthetoceratinae by Hulbert and Whitmore (2006); and to Synthetoceratini by Webb (1981), Prothero (1998), Webb et al. (2003) and Prothero and Ludtke (2007).
With a length of 2 m (6 ft 8 in), Synthetoceras was the largest member of its family. It was also the last, and had what is considered to be the protoceratids' strangest set of horns. The two horns above its eyes looked fairly normal and similar to those of many modern horned mammals, but on its snout it had a bizarre, long horn with a forked tip that gave it a Y shape. Only males had this strange horn, and they probably used it in territorial fights.
- Specimen 1: 332.4 kg (730 lb)
- Specimen 2: 228.3 kg (500 lb)
Fossils have been recovered from:
- Stage Hill II, Arikaree Group, Wildcat Hills Beds Formation, Scotts Bluff County, Nebraska
- Guernsey Site, Upper Harrison Beds Formation, Platte County, Wyoming
- PaleoBiology Database: Poabromylus, basic info
- R. A. Stirton. 1932. University of California Publications, Bulletin of the Department of Geological Sciences 21(6)
- J. T. Thurmond and D. E. Jones. 1981. Fossil Vertebrates of Alabama 1-244
- R. L. Carroll. 1988. Vertebrate Paleontology and Evolution. W. H. Freeman and Company, New York 1-698
- D. R. Prothero and J. A. Ludtke. 2007. Family Protoceratidae. in D. R. Prothero and S. Foss (eds.), The Evolution of Artiodactyls 169-176
- Palmer, D., ed. (1999). The Marshall Illustrated Encyclopedia of Dinosaurs and Prehistoric Animals. London: Marshall Editions. p. 273. ISBN 1-84028-152-9.
- M. Mendoza, C. M. Janis, and P. Palmqvist. 2006. Estimating the body mass of extinct ungulates: a study on the use of multiple regression. Journal of Zoology 270(1):90-101
- Prothero D.R., 1998. Protoceratidae. pp. 431–438 in C.M. Janis, K.M. Scott, and L.L. Jacobs (eds.) Evolution of Tertiary Mammals of North America Cambridge University Press, Cambridge.
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