English: Size comparison of the mosasaurin mosasaurine mosasaurid mosasauroid Mosasaurus. Mosasaurus hoffmannii is the largest species of this genus. The specimen catalogued as CCMGE 10/2469 (also known as the "Penza specimen") is among the largest known specimens of this species, with an estimated length of around 1.7 m (5.6 ft). Skull length to total body length estimates for this species vary, with Russell (1967) providing a ratio of 1:10, while Fanti et. al. (2014) thought that it was closer to 1:7. Published material pertaining to M. beaugei is rather fragmentary, its postcranium was here restored following skeletal mounts, photos of unpublished specimens, and M. hoffmannii. It was estimated to have a total length (TL) of 8–10 m (26–33 ft) by Bardet. The other two depicted species, M. lemonnieri and M. missouriensis, are known from much more coplete remains, allowing their proportions to be drawn out much more confidently. The smaller individual of M. lemonnieri is the holotype specimen, IRSNB R 28; the larger one is IRSNB 3189. M. missouriensis is here scaled to the 1.11 m (3.6 ft)-long skull of KUVP 1034. The diver silhoutte is from File:Scuba33.jpg, which is by NOAA and in the public domain.

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• Fanti, F.; Cau, A.; Negri, A. (2014). "A giant mosasaur (Reptilia, Squamata) with an unusually twisted dentition from the Argille Scagliose Complex (late Campanian) of Northern Italy". Cretaceous Research 49: 91e104.
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• Quarry map of M. lemonnieri
• Lingham-Soliar, T. (2000). "The Mosasaur Mosasaurus lemonnieri (Lepidosauromorpha, Squamata) from the Upper Cretaceous of Belgium and The Netherlands". Paleontological Journal 34: S225–S237.
• Mosasaurus missouriensis fossil
• Mosasaurus missouriensis skull diagram
• Ikejiri, T.; Lucas, S. G. (2015). "Osteology and taxonomy of Mosasaurus conodon Cope 1881 from the Late Cretaceous of North America". Netherlands Journal of Geosciences 94 (1): 39-54. DOI:10.1017/njg.2014.28.
• Bardet, N.; Suberbiola, X. P.; Iarochene, M.; Bouyahyaoui, F.; Bouya, B.; Amaghzaz, M. (2004). "Mosasaurus beaugei Arambourg, 1952 (Squamata, Mosasauridae) from the Late Cretaceous phosphates of Morocco". Geobios 37 (3): 315-324.
• Bardet, N.; Houssaye, A.; Vincent, P.; Suberbiola, X. P.; Amaghzaz, M.; Jourani, E.; Meslouh, S. (2015). "Mosasaurids (Squamata) from the Maastrichtian phosphates of Morocco: Biodiversity, palaeobiogeography and palaeoecology based on tooth morphoguilds". Gondwana Research 27 (3): 1068-1078.
• Mosasaurus beaugei skeletal mount photograph
• Another photograph of the mount
• More photographs of a mount
• Photograph of an M. beaugei fossil