Marmoarsaurus is an extinct genus of teleosaurid thalattosuchian. The genus and type species, M. obtusus, were named by Richard Owen in his 1840–1845 volume Odontography, the genus in the text,Owen, R. 1840–1845. Odontography. Hippolyte Bailliere, London, United Kingdom. Volume 1:p. 291. the species in a caption.Owen, R. 1840–1845. Odontography. Hippolyte Bailliere, London, United Kingdom. Volume 2:p. 20, plate 75A (figures 5A and 5B). Owen provided little information on the taxon beyond that it was based on a tooth from the Forest Marble. Woodward (1885) later noted that the tooth was from Wiltshire and had come from the collection of Dr. Channing Pearce, and commented "Genus and species imperfectly characterized, and apparently ignored in all later works."
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