Morinosaurus

Morinosaurus Temporal range: Upper Jurassic
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Sauropsida
Superorder:	Dinosauria
Order:	Saurischia
Suborder:	Sauropodomorpha
Infraorder:	Sauropoda
Family:	unknown
Genus:	Morinosaurus H. E.Sauvage, 1874
Species:	M. typus H. E. Sauvage, 1874

Morinosaurus (meaning "Morini lizard", for an ancient people of northern France) was a genus of sauropod dinosaur from an unnamed formation of Kimmeridgian-age Upper Jurassic rocks from Boulogne-sur-Mer, Départment du Pas-de-Calais, France. It is an obscure tooth genus sometimes referred to the Lower Cretaceous English wastebasket taxon Pelorosaurus.

History and taxonomy

The French paleontologist H. E. Sauvage based this genus on a single worn tooth, apparently now lost, which he compared to those of Hypselosaurus.^[1] Oddly, despite illustrations of the tooth, and the implications of comparing it to a titanosaur with narrow-crowned teeth, it was included as a synonym of Pelorosaurus in two major reviews.^[2][3] Pelorosaurus, being a putative brachiosaurid, is assumed to have had broad-crowned teeth.

Age, however, was not an issue, because it was referred to the possible Pelorosaurus species P. manseli (="Ischyrosaurus"), which was also from the Upper Jurassic (the question of whether "Ischyrosaurus" or any Jurassic species should be included in Pelorosaurus at all is another issue). The most recent review considers it to be a nomen dubium without further comment.^[4]

Sauvage also suggested that a partial right humerus belonged to the type individual.^[1]

Paleobiology

Morinosaurus would have been a large, quadrupedal herbivore.^[4] Having titanosaur-like teeth may suggest more titanosaurian- or diplodocoid-like feeding habits, but this is speculative. The tooth crown was 50 mm (1.97 im) tall and had a cross-section of 16 by 12 mm (0.63 by 0.47 in).^[1]

References

1. ^ ^{a b c} Sauvage, H.E. (1874). Memoire sur les dinosauriens et les crocodiliens des terrains jurassiques de Boulogne-sur-Mer. Mémoires de la Société Géologique de France, second series. 10:1-58. [French]
2. ^ Romer, A.S. (1956). Osteology of the Reptiles. University of Chicago Press:Chicago 1-772. ISBN 0-89464-985-X
3. ^ Steel, R. (1970). Part 14. Saurischia. Handbuch der Paläoherpetologie/Encyclopedia of Paleoherpetology. Part 14. Gustav Fischer Verlag:Stuttgart p. 1-87.
4. ^ ^{a b} Upchurch, P.M., Barrett, P.M., and Dodson, P. (2004). Sauropoda. In: Weishampel, D.B., Dodson, P., and Osmólska, H. (eds.). The Dinosauria (2nd edition). University of California Press:Berkeley 259-322. ISBN 0-520-24209-2

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