The ninth of ten likely Formula One cars to hit the track this season was unveiled ahead of this week's Barcelona group test, as Scuderia Toro Rosso took the wraps off its STR4.

The car, which the team hopes will emulate its predecessor and win races, is based on the Red Bull RB5 design launched exactly a month ago, but features the now-familiar STR version of the iconic brand logo.

The STR4 will be driven by Sebastien Bourdais and rookie Sebastien Buemi this season, following Sebastian Vettel's departure to Red Bull Racing, and will begin testing immediately, as both drivers attempt to replicate recent testing performances, when they out-paced the other 2009 cars with the '08-spec STR machine.

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Further images from the launch and first group test can be found HERE ...