Epidexipteryx hui, the strange looking maniraptoran from the Late Jurassic of China. Body length without the 4 long ribbon-like tail feathers is about 25 cm. Proportions based on 's skeletal.
Ah, difficult question... According to the latest analysis by Lee an co-workers, both Archaeopteryx and Epidexipteryx are Avialians, so in that sense they are related...