How many pear fruit types are there?

Pears....how many types are there all together?
How many pear fruit types are there?
According to Pears USA, there are over 3000 varieties of pears world-wide - but not all of them are the style we're familiar with:

http://www.usapears.com/pears/default.as...



Other sites say there are over 5000:

http://www.wisegeek.com/what-are-the-dif...



Or were you looking for the three main types grown in the U.S.: European, Asian %26amp; Oriental Hybrid

http://aggie-horticulture.tamu.edu/exten...
Reply:i think about 30-40 im not sure i could be wrong.
Reply:There are about 30 primary species.