Yeah, you'd probably just have to size down the ol' Quetzalcoatlus to make a decent Pterydactyl, a nice Pteranadon, or even a Ramphorincus (for the tinier ones)...
Same basic body shape, just on a smaller scale.
Maybe play with it a bit by giving the smaller breeds camulflage, or a higher maneuverability or whatever. Maybe a poison, or some other minor special talent to distinguish them and their habits/habitats/diets/whatever.