Ornithopoda,
Iguanodontidae Cope, 1869

Mantellisaurus atherfieldensis (Hooley, 1925)

Mantellisaurus was a herbivorous dinosaur, feeding on the plants, such as conifers, cycads and tree-ferns that are found in the Wessex Formation. It has been noted that Mantellisaurus is both quadrupedal and bipedal, although trackway evidence suggests it favoured the former.
(More info can be found at DinoWight Palaeoecology)

Description of Material

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The teeth can reach up to 40 mm (1½ inches) in height, and show an expanded crown and fine denticulation. The teeth of different jaws have different wear marks. On the upper jaw there is a prominent keel in the labial (outer) surface, where as in the lower jaw the teeth have two less prominent ridges on the lingual (inner) surface. To simplify matters, this genus will be described twice, once for each species.

Mantellisaurus has a low skull, with a low angle to the articulation between the dentary and predentary. A rostrally expanded beak gives it, when viewed from above, an hourglass shaped head. Mantellisaurus had a short thumbspike and elongate, gracile metacarpals. There were 3 phalanges in the forth and fifth digits. The forearms were only 50% of the length of the hindlimbs. The neural spines were fairly tall, with ossified tendons arranged along them, and there may have been a ridge along the back

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