However, in a 2011 publication Senter stated that a personal examination of the holotype of "S. millenii" led him to conclude that his earlier separation of NGMC 91 from "S. millenii" was based on anatomical misinterpretations. As the two specimens were "identical in all character states" used in his phylogenetic analysis, were from similar stratigraphic levels and "uniquely share the presence of a triangular coracoid with a large, oval foramen", Senter concluded that NGMC 91 does belong to the species "Sinornithosaurus millenii".