However, more recently the bones were reassessed as an alvarezsaurid, the first to be known from Europe, and this theory, originally proposed in 1988, has since withstood further scrutiny . " Bradycneme " and " Elopteryx " on the other hand seem to be more advanced maniraptoran theropods.
12.
These three genera " Bradycneme ", " Elopteryx " and " Heptasteornis " have been synonymized, split, and reassessed numerous times since then in part because of the fragmentary nature of the remains; there exist three proximal femora and three distal tibiotarsi, which may belong to one, two or three species.
