Name: Galeamopus ‭(‬need/want helmet‭)‬.
Phonetic: Ga-le-am-o-pus.
Named By: E.‭ ‬Tschopp,‭ ‬O.‭ ‬Mateus‭ & ‬R.‭ ‬B.‭ ‬J.‭ ‬Benson‭ ‬-‭ ‬2015.
Synonyms: Diplodocus hayi.
Classification: Chordata,‭ ‬Reptilia,‭ ‬Dinosauria,‭ ‬Saurischia,‭ ‬Sauropoda,‭ ‬Diplodocidae,‭ ‬Diplodocinae.
Species: G.‭ ‬hayi‭ (‬type‭), G. pabsti‬.
Diet: Herbivore.
Size: Holotype individual roughly about 27 meters long based upon 1.44 meter femur, 0.98 meter fibula and scaled to standard diplodocine diplodocid sauropod proportions.
Known locations: USA,‭ ‬Morrison Formation deposits in Colorado and Wyoming.
Time period: Kimmerigian of the Jurassic.
Fossil representation: Skulls and partial post cranial fossils from several individuals.

       The history of Galeamopus goes all‭ ‬the way back to‭ ‬1902‭ ‬when the first fossils were discovered in the US state of Wyoming.‭ ‬In‭ ‬1906‭ ‬the fossils were assigned to the Diplodocus genus,‭ ‬but in‭ ‬1924‭ ‬they were given their own species D.‭ ‬hayi,‭ ‬upon the basis that they were clearly different to other Diplodocus type species.‭ ‬For almost a century afterwards,‭ ‬D.‭ ‬hayi was held as a valid species of Diplodocus,‭ ‬but then in‭ ‬2015‭ ‬everything changed.‭ ‬A study conducted by Emanuel Tschopp,‭ ‬Octávio Mateus and Roger Benson focused upon spotting key differences between fossils assigned to both genera.‭ ‬What they found was the specimens of Diplodocus hayi had thirteen clear autapomorphies that distinguish it as distinct from other Diplodocus species,‭ ‬enough to make it a separate genus which now bears the name Galeamopus.‭ ‬However,‭ ‬while this revision was big news in itself,‭ ‬it was overshadowed by an even bigger story,‭ ‬when this same study also concluded that Brontosaurus was actually separate from Apatosaurus,‭ ‬making Brontosaurus a scientifically valid genus for the first time since‭ ‬1903.
       At this point it should be obvious that Galeamopus was what is known as a diplodocid sauropod,‭ ‬but this can be refined further to calling it a diplodocine due to its closer similarity to Diplodocus.‭ ‬Diplodocine members of the Diplodocidae are noted as being more gracile‭ (‬lightly built‭) ‬than their apatosaurine‭ (‬closer to Apatosaurus‭) ‬cousins.‭ ‬Galeamopus also certainly had a whip-like tail that may have been capable of producing loud cracking sounds.‭ ‬It is also possible that Galeamopus had a series of short keratinous spines running down the length of its body as these have been seen in some other species of diplodocid sauropods.

Further reading
-‭ ‬A specimen-level phylogenetic analysis and taxonomic revision of Diplodocidae‭ (‬Dinosauria,‭ ‬Sauropoda‭)‬.‭ ‬-‭ ‬PeerJ‭ ‬3:e857.‭ ‬-‭ ‬E.‭ ‬Tschopp,‭ ‬O.‭ ‬Mateus‭ & ‬R.‭ ‬B.‭ ‬J.‭ ‬Benson‭ ‬-‭ ‬2015.
- Osteology of Galeamopus pabsti sp. nov. (Sauropoda: Diplodocidae), with implications for neurocentral closure timing, and the cervico-dorsal transition in diplodocids. - PeerJ. 5. - Emanuel Tschopp & Octávio Mateus - 2017.


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