Dentition whether or not it has erupted. Regarding premolars, there is disagreement regarding whether the third type of deciduous tooth is a premolar (the general consensus among mammalogists) or a molar (commonly held among human anatomists). There is thus some discrepancy between nomenclature in zoology and in dentistry. This is because the terms of human dentistry, which have generally prevailed over time, have not included mammalian dental evolutionary theory. There were originally four premolars in each quadrant of early mammalian jaws. However, all living primates have lost at least the first premolar. "Hence most of the prosimians and platyrrhines have three
Northern dry deciduous forests about 2.5 percent of the ecoregion's area. Northern dry deciduous forests The Northern dry deciduous forests is a tropical dry broadleaf forest ecoregion of east-central India. It covers an area of , extending across portions of Andhra Pradesh, Chhattisgarh, Orissa, and Jharkhand states. The region extends north and south in the dry western rain shadow of the Eastern Ghats range, which block the moisture-laden monsoon winds from the Bay of Bengal to the east. It is surrounded by the more humid Eastern Highlands moist deciduous forests ecoregion. By the mid-1990s, more than three-quarters of the ecoregion's natural habitat had been