Diplodocus hayi Holland, 1924 (type) Galeamopus is a genus of herbivorous diplodocid sauropod dinosaurs.

The first specimen referred to Galeamopus was collected by Marshall P. Felch in September, 1884 at his quarry in Garden Park, Colorado.

[2] The type specimen of Galeamopus was discovered by fossil hunter William H. Utterback in 1902 near Sheridan, Wyoming, in the Red Fork Powder River Quarry A for the Carnegie Museum of Natural History.

[3] Another Galeamopus specimen was discovered and collected by Peter Kaisen in 1903 at Bone Cabin Quarry, Wyoming during an American Museum of Natural History expedition.

[2] In 2015, it was renamed as the separate genus Galeamopus by Emanuel Tschopp, Octávio Mateus and Roger Benson.

It was named after the Swiss paleontologist Dr. Ben Pabst, who discovered the specimen and helped mount the skeleton at Sauriermuseum Aathal.

The outer edge of the top surface of the shinbone forms a pinched process, behind the cnemial crest at the front.

Combined, there are thirteen autapomorphies present in Galeamopus, exactly the minimum the study used as a criterion to distinguish separate genera.

[1]The cladogram below shows one hypothesis on the relationships of Galeamopus to other diplodocids, as found by the analysis of Tschopp & Mateus (2017).