Nagara - these temples evolved mainly in northern India,
being easy spotted by their conical/beehive shape. The 'nagara' later developed
several substyles including latina (single main spire crowned with a
ribbed ring - the amalasaraka), sekhari (smaller spires surrounding
the main spire), and bhumija (central projection tapering to the top
on all four faces, decorated with rows of miniature spires).
Dravida - these temples evolved in the south and the superstructures
were mainly pavilions arranged in layers (tiers), creating a pyramidal shape. The shikharas
were ornate with several elements and/or niches. Both types usually featured high gateways
called gopurams. 
Vesara - these temples were a cross between Nagara
and Dravida and came to be seen in the Deccan region, mainly in Andhra
Pradesh and Karnataka.