A new Jehol find? Nope!
itself! Two new specimens (an adult and a juvenile) have been found with feather traces, and a long-known adult specimen has been discovered to have what may be attachment points for large feathers on the arms. This means that pennibrachiae go down to the base of maniraptoriforms! The juvenile, however, doesn't preserve pennibrachiae, so it might mean that in these basal maniraptoriforms only the adults had pennibrachiae, and that pennibrachiae originally evolved for display. In addition, this also opens up the possibility of finding feathered dinosaur specimens in coarser-grained sediment than usually expected, as long as fossil hunters keep a sharp eye out for those delicate feather traces.