Marmarospondylus ("marble [reference to the Forest Marble Formation] vertebra") is a dubious genus of sauropod dinosaur from Middle Jurassic deposits in the English Midlands.
The type species, Marmarospondylus robustus, was described by Richard Owen as a species of the Late Jurassic genus Bothriospondylus in 1875.Owen, R., 1875, "A monograph on the Fossil Reptilia of the Mesozoic Formations. Monograph on the Genus Bothriospondylus", Palaeontographical Society, 29: 15-26 The holotype, NHMUK R.22428, a dorsal vertebra, was found in the Bathonian-age Forest Marble Formation at Bradford-on-Avon, Wiltshire. Owen himself in an addendum to the same publication coined Marmarospondylus for B. robustus, presumably due to its being older than B. suffossus. Recent publications have treated Marmarospondylus as a dubious member of Macronaria.P. Upchurch, P. M. Barrett, and P. Dodson. 2004. Sauropoda. In D. B. Weishampel, H. Osmolska, and P. Dodson (eds.), The Dinosauria (2nd edition). University of California Press, Berkeley 259-322D. Naish and D. M. Martill. 2007. Dinosaurs of Great Britain and the role of the Geological Society of London in their discovery: basal Dinosauria and Saurischia. Journal of the Geological Society, London 164:493-510/Mannion, P.D., 2010 "A revision of the sauropod dinosaur genus 'Bothriospondylus' with a redescription of the type material of the middle Jurassic form 'B. madagascariensis'", Palaeontology, 53(2): 277–296
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