What are some reasons that paleontologists link microraptor with caudipteryx and not pterodactyls?
Because pterosaurs are not feathered, while caudipteryx's very
name means, tail-feather. Microraptor, unlike any known animal in
the world, had four feathered wings. Additionally, there are more
skeletal similarities between microraptor and caudipteryx, with
them both being theropods while pterosaurs were an entirely
different group of animals.
(for more info, watch NOVA: MYSTERY OF THE FOUR_WINGED