hypsodont


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hypsodont

[′hip·sə‚dänt]
(vertebrate zoology)
Of teeth, having crowns that are high or deep and roots that are short.
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A comprehensive revision was made by Hussain (1971), and noted that a single migration of a Hipparion primitive species, Hipparion nagriensis during Lower Nagri time led to the local diversity of two Hipparion taxa in the Middle Siwalik horizons: Hipparion antelopinum, a small form with slender elongate third metapodials and more hypsodont teeth, and Hipparion theobaldi, a large form with more massive metapodials and more hypsodont teeth than Hipparion nagriensis.
Open grassy areas did exist in the vicinity, as attested by the presence of hypsodont rodents (Diamantomys) (Lavocat, 1973), macroscelidids (Myohyrax) (Butler, 1962, 1978a) and rhinocerotids (Ougandatherium) (Guerin and Pickford, 2003).
54) Molar Hypsodonty: 0 = brachydont, 1 = weakly hypsodont, 2 = highly hypsodont.
6C-D) is an incomplete cheek tooth that has a crown length of at least 50 mm and is very hypsodont (crown height exceeds 136 mm).
Kurten & Anderson (1980) stated that "the hypsodont teeth were adapted to chew coarse vegetation, and the dentition suggests browsing habits.
The hypsodont molars of the lower jaws often fall out of the alveoli, but the splayed roots of the p4 and the long arc of the incisor commonly permit those teeth of Perognathus and Chaetodipus to stay in place.
These vegetational shifts are correlated with the rise in South America of mammals with hypsodont teeth adapted to grazing (Stebbins, 1981).
A such study might have employed the usual division of fossil horses into brachydont and hypsodont taxa.
As indicated by measurements (Table I), the specimens are extremely hypsodont and show less complicated plications.