| Brachauchenius Temporal range: Late Cretaceous,
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| Holotype specimen of B. lucasi (USNM 4989) | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Reptilia |
| Superorder: | †Sauropterygia |
| Order: | †Plesiosauria |
| Family: | †Pliosauridae |
| Subfamily: | †Brachaucheninae |
| Genus: | †Brachauchenius Williston, 1903[1] |
| Type species | |
| †Brachauchenius lucasi Williston, 1903[1]
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Brachauchenius (meaning 'short neck') is an extinct genus of pliosaurid that lived in North America (United States) and Morocco[2] during the Late Cretaceous.
- ^ a b Williston SW. 1903. North American plesiosaurs. Field Columbian Museum, Pub. 73, Geological Series 2 (1):1-79. (29 plates)
- ^ ANGST, D.; BARDET, N. (2015-08-05). "A new record of the pliosaur Brachauchenius lucasi Williston, 1903 (Reptilia: Sauropterygia) of Turonian (Late Cretaceous) age, Morocco". Geological Magazine. 153 (3): 449–459. doi:10.1017/s0016756815000321. ISSN 0016-7568. S2CID 128840902.