Who can keep track of all the touchscreen smartphones — and their attendant app stores — that emerged from Mobile World Congress this week to compete with Apple’s AAPL iPhone?

RBC Capital’s Mike Abramsky can. Attached to a report to clients released Friday is a handy chart of “emerging competitors” that covers most of the latest mobile operating systems: Palm’s PALM webOS, Microsoft’s MSFT Windows Mobile 6.5, Google’s GOOG Android, Nokia’s NOK Symbian S60 and couple of proprietary outliers.

The chart would be more realistic if it included the two smartphones battling most fiercely for the U.S. market: the iPhone and Research in Motion’s RIMM BlackBerry.

But it’s hard to tell the players without a scorecard, and this is a good start. The full chart is posted below the fold, with thanks to AppleInsider.

Abramsky sees the increasingly competitive landscape — and the pressure it will put on Cupertino to change the iPhone’s pricing structure when and if it ships a third-generation model this year — as further justification for the “underperform” rating he slapped on Apple in January. Abramsky’s $70 price target is the lowest in the business. (See Mike Abramsky’s bad Apple advice.)

Apple shares closed Friday at $91.2, up 0.62% for the day.

Below: Abramsky’s taxonomy.

Click to enlarge.