Temporal range: Late Cretaceous
|H. crassicauda vertebra from North Carolina.|
Neosaurus Gilmore & Stewart, 1945 (preoccupied)
Hypsibema is a little-known genus of dinosaur from the Late Cretaceous (Campanian stage, around 75 million years ago). Its giant fossils were found in the U.S. states of North Carolina and Missouri. It is believed to be a hadrosauroid, although the Missouri remains were first thought to belong to a small sauropod ("Neosaurus", renamed Parrosaurus).
The type species, Hypsibema crassicauda, was described by Edward Drinker Cope, and was found in Sampson County, North Carolina in 1869. The generic name is derived from Greek υψι/hypsi, "high", and βεμα/bema, "step", as Cope believed that the species walked particularly erect on its toes. The specific name means "with a fat tail" in Latin. The syntypic series, USNM 7189, originally consisted of a caudal vertebra, a metatarsal, and two femoral fragments that were originally identified as humeral and tibial fragments, all found in 1869 by North Carolina state geologist professor Washington Carruthers Kerr in the Black Creek Group of North Carolina. A second vertebra referred to the species, USNM 6136, was later discovered by Edward Wilber Berry and referred to H. crassicauda in 1942. In their 1979 review of dinosaur remains from the Black Creek Group, Baird and Horner (1979) noted that the femoral fragments come from a tyrannosauroid similar to Dryptosaurus, and made the caudal vertebra included in the syntype series of H. crassicauda the lectotype, while stating that the metatarsal could not belong to the same individual as the caudal.
A second species, H. missouriensis, named by Donald Baird and Jack Horner in 1979 (previously Parrosaurus missouriensis Gilmore 1945), is since 2004 the official state dinosaur of Missouri. However, it may be the same species as the North Carolina material Its holotype is USNM 16735, a set of vertebrae.
- E.D. Cope, 1869, "Remarks on Eschrichtius polyporus, Hypsibema crassicauda, Hadrosaurus tripos, and Polydectes biturgidus", Proceedings of the Academy of Natural Sciences of Philadelphia 21: 191-192
- ^Lull, R.S., and Wright, N.E. (1942). Hadrosaurian Dinosaurs of North America. Geological Society of America Special Paper 40:1-242.
- D. Baird and J. R. Horner, 1979, "Cretaceous dinosaurs of North Carolina", Brimleyana 2: 1-28
- "Archived copy". Archived from the original on May 28, 2013. Retrieved July 10, 2013.
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