Galeamopus pabsti is a large sauropod from the Diplodocinae family. It would have been a large, slender quadrapedal herbivore with a elongated head, long neck, and whip-like tail.
Galeamopus would have lived in the Late Jurassic floodplains of what is the current-day North-central United States.
The holotype consists of a near-complete skull, and a fair amount of the rest of the skeleton. It was discovered in 1995 by Ben Pabst (from the Swiss Sauriermuseum Aathal) in Northern Wyoming. Believed to be a Diplodocus specimen, it was mounted in Sauriermuseum Aathal as one. After close study in 2015 by Emanuel Tschopp and Octávio Mateus, it was discovered to be a new species that they renamed Galeamopus pabsti.
A paratype was discovered in central Colorado consisting of a partial skull and some vertebrae. It was described in 1884 by Othniel Marsh as a Diplodocus lacustris skull, and was one of the seven separate speciemtns used to build the mounted Diplodocus carnegii display at the Carnegie Museum of Natural History in Pittsburgh, USA.
Galeamopus is Latin for "want helmet". The discoverer and describer of the original Galeamopus hayi, known as Diplodocus hayi at the time, both had a first name of William. In 2015, when Swiss paleontologists re-described Diplodocus hayi as a new species, they wanted to honour the original two Williams, and "want helm" can be translated into German as Wil-helm, the German form of William. Additionally, the name also refers to the fact that the braincase appears to be delicate compared to other sauropods. Pabsti refers to the discoverer of the holotype, Austrian paleontologist Ben Pabst.
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