While integrating the Pathfinder Beta rules to TOS+, I noticed that the Starknife weapon was not part of any of the Weapon Groups discussed in the Weapon Training ability of the Fighter.
I will assume it is in the light blade and the thrown weapon groups (as the dagger) until the designer says otherwise.
RiTz21
http://TheOnlySheet.com
It seems the Elven Curve Blade suffers from the same issue...
I've tagged it as a Heavy Blade for now.
RiTz21